BFG 6600GT AGP Volt Mod Help ( Pics Inside )

I have gone and bought my self a 6600GT, which was on special offer, to tinker with as I can't face breaking my 6800 Ultra and that seems to have maxed out anyway. Now I have had a look around and I can't find a VMod for the AGP version of the 6600GT only the PCI-E version and the power circuit seems different.

http://www.bentinck-cleeves.demon.co.../volt/back.jpg

So I am trying to work out how to V-Mod this card but I need some help from the experts. The main problem I have is that I have identified two chips that are likely to control voltage supplies, they are:

The Intersill ISL6549CB

http://www.bentinck-cleeves.demon.co.../ISL6549CB.jpg

And the Intersill ISL6534CR

http://www.bentinck-cleeves.demon.co.../ISL6534CR.jpg


Now which one is the one I need to concentrate on is probably the main question. Secondly the datasheets for both chips are not on the web and I had to contact Intersill to send me a datasheet for the ISL6549CB which is marked Confidential so I can't really post it on the web. You can just e-mail them though and they will send it to you through e-mail.

Looking at the datasheet for the ISL6549CB I think I can work out how to alter the output voltage but if this is some how tied to the other controller then I am not sure what to do.

Any help appreciated and my MultiMeter is at the ready :)

ok first thing: load up the bios in nibitor and see what the green voltage is
then you look on the bottom one i think
the rectangle ic will be memory voltage. the ic near the monitor plugs could also be it
try looking for the fb pins and take a reading of the voltage to compare to the "green" voltage
it might read differently so you have to follow traces or meacure cap legs

I currently have the complete datasheet for all version of ILS6534.
ISL6534 is normally used for memory. It is also used on GF 6800 *

this is how are organised all pins around this chip
http://www.kirikoo.net/images/5Badeu...228-231713.jpg

and normally, vddq is vout1 and vddr is vout2

i think there is two power regulator chips cause you also need to feed the AGP to PCI-E bridge ;)

Right I have read the PDF and as far as I can tell this is what I am interested in, specifically what values R1 and R4 are at. R1 can not be modified as its part of the compensation circuit so to adjust what I think should be the v.core I need to adjust the voltage of R4, working out the value I want by the equation in the diagram.

http://www.bentinck-cleeves.demon.co.../schematic.jpg

The trouble is I am getting confused and can't work out which resistor is which, so i took some readings and put them on the picture below. If some one could either tell me I’m getting it completely wrong or which resistors I’m after it would be most appreciated :)

http://www.bentinck-cleeves.demon.co...20voltages.JPG

At least in cpu voltage regulators from motherboards its only necessary to ground with a pot the FB pin to take some voltage from there and increase the voltage supplied by the vreg.

Isn't the same aproach for graphics cards?

I am starting to think I may just give that a go, although I wanted to try and work out what I was doing before doing it. Using the equation given and the core voltage set in the 6600GT's BIOS of 1.4V you end up with 0.75 V = R1 / R4

Now as R1 is part of the compensation circuit and according to the notes shouldn't be changed then using there "usual" value for R1 of 1k that makes R4 aproximaterly 1.3k. Trouble is I can't find a resistors to match.

Found the voltage measurement caps :

http://www.bentinck-cleeves.demon.co...citor_volt.jpg

Quote:

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Originally Posted by IronFire

I am starting to think I may just give that a go, although I wanted to try and work out what I was doing before doing it. Using the equation given and the core voltage set in the 6600GT's BIOS of 1.4V you end up with 0.75 V = R1 / R4

Now as R1 is part of the compensation circuit and according to the notes shouldn't be changed then using there "usual" value for R1 of 1k that makes R4 aproximaterly 1.3k. Trouble is I can't find a resistors to match.

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But wouldn't route some current from the feedback pin to ground work?

well the resistance on the feedback pin is ~ 500 Ohms so I put a 5k ohms VR from the FB pin to GRD and turned the resistance down yet the voltage is not increasing. What am I doing wrong ?

there's a formula to calculate the pot resistence u need to use. I can't find it tough.
Try seeing if you overclock is the same, maybe you're just measuring from the wrong spot.

If not, i don't know, maybe go till 1k with that one, if nothing happens maybe try a 1k one...

If somebody with more knowledge in this would help...

Some one with an idea please send a hand :(

What's the value of R1 or R4?

I know that if you put a pot resistance of 10K in parallel of one of those, you won't take much risks.

Decrease the pot until 1K. If nothing happens when you are at this point, buy a 1K pot and do the same.

Just take care to not go too far (never reach the 0). The current always takes the path that has the least resistance.

You can connected a 100 Ohms resistance to your pot in series. This costs nothing and this may save you GPU ;)

Have fun.
Sergio.

I have yet to work out what they are, if you can point them out on one of the pictures above that would very usefull.

Quote:

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Originally Posted by IronFire

I have yet to work out what they are, if you can point them out on one of the pictures above that would very usefull.

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Ok let's get out my multimeter ;)

But it won't be easy...

I'll keep you informed.

Quote:

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Originally Posted by IronFire

Found the voltage measurement caps :

http://www.bentinck-cleeves.demon.co...citor_volt.jpg

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So if I understand good the red one is mem voltage & yellow/green r core voltage.
Hellfire we need ya :D

Hellfires input would be most apreciated, this little card has alot of potential and it would be great if it could run over 600 core with out artifacts.

Hows about looking at the front of the card instead? ;)

Gainward 6600GT PCIE
http://www.vr-zone.com.sg/Shamino/6600gt/vgpumod.JPG

Winfast 6600GT PCIE
http://www.vr-zone.com.sg/Shamino/6600gt/d.JPG

Original is 550 ohms. Pencil or VR will work.

http://www.vr-zone.com.sg/Shamino/6600gt/pencil.JPG

Each drop of 25 ohms will give you roughly 0.05v more. Reducing from 550 ohms to 480 ohms gives me 1.4v at start up, about 0.15v extra.

I ve done it & dont c any difference, not in temp not in oc. I didt check it with multimetr coze I rma it like 3 weeks ago :D.
I found the C37 on the left side of the card not right, is it ok?
-->-->--> http://www.xtremesystems.org/forums/...chmentid=22512

Doing a Vmod without a multimeter is not good :)
But since its a different layout for that Winfast AGP, then I cannot say. FYI, the 550ohms is small resistance, in order to reduce it by some, you will need quite some graphite on it, therefore its best to check with a multimeter for the resistance, and for the voltage.
And I dont think its on the left, probably a different coded one since it should be near the PWM area.

Quote:

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Originally Posted by LardArse

http://www.vr-zone.com.sg/Shamino/6600gt/pencil.JPG

Each drop of 25 ohms will give you roughly 0.05v more. Reducing from 550 ohms to 480 ohms gives me 1.4v at start up, about 0.15v extra.

---

I can't find this component on my AGP card, what should I be looking for ?

Quote:

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Originally Posted by $0m#0n#

I ve done it & dont c any difference, not in temp not in oc. I didt check it with multimetr coze I rma it like 3 weeks ago :D.
I found the C37 on the left side of the card not right, is it ok?
-->-->-->

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The component that you have shown on your picture is not labbled c37 on my BFG card, and I doub't it is anything to do with the voltage control as that compnent and 4 others are replicated in the same layout by every memory chip, it also has a resistance of 240 Ohms which isn't what we are after.

LardArse can you please shed a little more light on the situation :)

Quote:

---

Originally Posted by IronFire

Right I have read the PDF and as far as I can tell this is what I am interested in, specifically what values R1 and R4 are at. R1 can not be modified as its part of the compensation circuit so to adjust what I think should be the v.core I need to adjust the voltage of R4, working out the value I want by the equation in the diagram.

http://www.bentinck-cleeves.demon.co.../schematic.jpg

The trouble is I am getting confused and can't work out which resistor is which, so i took some readings and put them on the picture below. If some one could either tell me I’m getting it completely wrong or which resistors I’m after it would be most appreciated :)

http://www.bentinck-cleeves.demon.co...20voltages.JPG

---

Just figured out the mem voltage mod, you just have to shade the resistor that is 0.5655k ohms. lowering the resistance will increases the voltage. There is the 0.6081K beside it. DO NOT shade that one. It will result in lower voltage. Beware of your shading though, ~100ohms drop will result in about 0.3V increase. Do not overshade.

I will try to figure out the GPU mod.

Quote:

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Originally Posted by ISS

Just figured out the mem voltage mod, you just have to shade the resistor that is 0.5655k ohms. lowering the resistance will increases the voltage. There is the 0.6081K beside it. DO NOT shade that one. It will result in lower voltage. Beware of your shading though, ~100ohms drop will result in about 0.3V increase. Do not overshade.

I will try to figure out the GPU mod.

---

Great job, this works a treat, here are my findings :


Giving it a little shade I reduced the resistance to 464.03 Ohms, this resulted in a voltage of aproximatly 2.41V. This had the following effect -

Stockvoltage at 2.1V - 3D Mark 2005 1 Loop No Artifacts

Auto Clock - 1.15Ghz
Manaul Highest Clock - 1.19Ghz

2.41V Voltage - 3D Mark 2005 1 Loop No Artifacts

Auto Clock - 1.16Ghz
Manaul Highest Clock - 1.21Ghz

Thanks for the help, can you please explain how you worked this out, such as which resistor on the photo relates to the diagram, as the entire reason I started this was to learn more ( My 6800 Ultra is better than my 6600GT :p ).

Roll on the GPU mod

it's the same for the Club3d AGP 8x Model?

I would like to try it, i want to achieve 10k points in 3dmark03 :P

I think I have found the resistors for the GPU mod. However, I don't think I will be releasing them. Those who are interested to try, pls PM me. Try at your own risk though. There are some things you need to take note.

Quote:

---

Originally Posted by IronFire

Great job, this works a treat, here are my findings :


Giving it a little shade I reduced the resistance to 464.03 Ohms, this resulted in a voltage of aproximatly 2.41V. This had the following effect -

Stockvoltage at 2.1V - 3D Mark 2005 1 Loop No Artifacts

Auto Clock - 1.15Ghz
Manaul Highest Clock - 1.19Ghz

2.41V Voltage - 3D Mark 2005 1 Loop No Artifacts

Auto Clock - 1.16Ghz
Manaul Highest Clock - 1.21Ghz

Thanks for the help, can you please explain how you worked this out, such as which resistor on the photo relates to the diagram, as the entire reason I started this was to learn more ( My 6800 Ultra is better than my 6600GT :p ).

Roll on the GPU mod

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VGPU mod is right here :toast:

Quote:

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Originally Posted by enzoR

VGPU mod is right here :toast:

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Same for AGP?

IronFire, I might be missing something but I wouldn't think 10MHz is much of a gain, especially considering the 0.3v rise. My XFX does 1.22 artifcact free without any mod.

Well either my card is rather sucky, the volt mod isnt working correctly or I need to try upping the speed via a BIOS flash, im open to suggestions.

Quote:

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Originally Posted by IronFire

Well either my card is rather sucky, the volt mod isnt working correctly or I need to try upping the speed via a BIOS flash, im open to suggestions.

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I have no suggestions in the electrical engineering dept. The only input I have is that when I'm playing with my OC, coolbits/rivatuner will sometimes let me set only 1.21GHz and sometimes it lets me do 1.22GHz, and I think it even depends on which drivers I'm using-- with 66.93 Forceware I first got 1.18GHz. After using 70.xx I'm at 1.22GHz. I think those margins are something to consider when you're looking at an apparent 10MHz gain.

Quote:

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Originally Posted by enzoR

VGPU mod is right here :toast:

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As far as I can tell this won't work on an AGP card.

sorry i didnt realize that article was for PCI-X

just tell us how to do the vgpu mod!!!
I'm dying to try that one out.

I thought I was doing the gpu mod last night as I put a vr on pin 4 for FB and was also surprised when the voltage did not go up .. I did manage to end up with opver 3v through the memory though :D

I should have read this thread first.

The spec sheets seem to show that the other IC is for DRAM but in this case it seems the 6549 is. The 6534 is it then but that has 3 FB pins.

Regards
Andy

Ok, it's pin 29 on the 6534, FB1.

http://www.aocb77.dsl.pipex.com/6600voltmod.jpg

This is roughly 500Ohms so I attached a 50k pot and set it at 10k. This gives me 1.20v measured on the caps, a few turns reducing the resistence and I am at 1.25v in BIOS ( and I assume 1.45+ in 3d ) so I will test it later.

There is a cap at the very bottom of the board and I think this more than likely shows the voltage for the AGP bridge chip, this seems set at 1.21v and does not go up with the gpu core voltage so that is good because that little bridge chip runs very hot.

Regards

Andy

IronFire: Please can you send me this two PDF file?

Sorry you have to e-mail Intersil directly for the files.


Ill try the core mod out when I have some free time.

I send 1 weak ago mail to intersil (rlucas01@intersil.com) but nobody doesn't reply me.

Quote:

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Originally Posted by _Dejan_

I send 1 weak ago mail to intersil (rlucas01@intersil.com) but nobody doesn't reply me.

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http://www.aocb77.dsl.pipex.com/ds-6549-13.pdf
http://www.aocb77.dsl.pipex.com/ISL6534_final_5.pdf

gpu mod only recommended if you have good cooling due to lack of low k on TSMC 0.11 micron process.

Regards

Andy

Here's the 6600 with both gpu and memory modded ( spot the two blue pots ) finally ended up at 635-645 core at 1.65v and 1231 memory at 2.15v.

http://www.aocb77.dsl.pipex.com/6600rig.jpg

Both vmem and vcore mods are very simple, the judgement comes with trading off temps with voltage on your cooling solution. Unless you have junked the stock heatsink I suggest you do not increases the voltage on the gpu much at all.

Regards

Andy

zakelwe: Thanks for PDF.

P.S. How do you do this vmod? Do you have AGP version card?Do you put one variable resistor to FB1(29pin) and ground, and another var. resistor to FB2(32pin) and ground?

Well I have done the GPU Vmod and it works but has no effect on my overclock :(

I used the little solder pad to the side of the IC's leg which is alot easier to solder to.

http://www.bentinck-cleeves.demon.co...lt/gpu_mod.jpg
http://www.bentinck-cleeves.demon.co...t/gpu_mod2.jpg

480 Ohms gave me 1.5090 V
475 Ohms gave me 1.5210 V
469 Ohms gave me 1.539 V

Yet my card will not overclock further than it did before at any settings, infact it actualy seems less stable with large texture sections in 3dMark 05 turning green at 590 Mhz with 1.539V yet with no volt mod they hardly ever apear.

What is affecting it ?

Quote:

---

Originally Posted by IronFire

Well I have done the GPU Vmod and it works but has no effect on my overclock :(

I used the little solder pad to the side of the IC's leg which is alot easier to solder to.

http://www.bentinck-cleeves.demon.co...lt/gpu_mod.jpg
http://www.bentinck-cleeves.demon.co...t/gpu_mod2.jpg

480 Ohms gave me 1.5090 V
475 Ohms gave me 1.5210 V
469 Ohms gave me 1.539 V

Yet my card will not overclock further than it did before at any settings, infact it actualy seems less stable with large texture sections in 3dMark 05 turning green at 590 Mhz with 1.539V yet with no volt mod they hardly ever apear.

What is affecting it ?

---

Overheating ? What temps do you hit during a run using rivatuner if you leave riuvatuner diagnostic running as you do the run ?

Regards

Andy

Quote:

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Originally Posted by IronFire

Well I have done the GPU Vmod and it works but has no effect on my overclock :(

I used the little solder pad to the side of the IC's leg which is alot easier to solder to.

http://www.bentinck-cleeves.demon.co...lt/gpu_mod.jpg
http://www.bentinck-cleeves.demon.co...t/gpu_mod2.jpg

480 Ohms gave me 1.5090 V
475 Ohms gave me 1.5210 V
469 Ohms gave me 1.539 V

Yet my card will not overclock further than it did before at any settings, infact it actualy seems less stable with large texture sections in 3dMark 05 turning green at 590 Mhz with 1.539V yet with no volt mod they hardly ever apear.

What is affecting it ?

---

I used a 10k resistor to ground, decreased to like 9k maybe, haven't measured yet, and it allows me to 633/1250, before only 590/1190. With no vmem mod.

I'm using watercooling.

I've a Leadtek 6600Gt....I can't understand english very well....Could you make me a litle mod guide for Vgpu e Vddr???

§PS: Sorry 4 my English.... :D

vkbms ti traduco io np, appena capisco :D


guys plz pics of point where solder???

tipical for italians...capiscono un cazzo :D

Quote:

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Originally Posted by TEDY

tipical for italians...capiscono un cazzo :D

---

mo ti faccio la pelle :D

i'm only 17, my english is school level...but i think your italian is worse than my inglish, than shut up...

my problem here is not english, but electronic...

Quote:

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Originally Posted by Malachia

vkbms ti traduco io np, appena capisco :D


guys plz pics of point where solder???

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doesn't matter Malachia..... I've buyed a DFI NF4 with a _Leadtek 6600GT Extreme .... :banana:

Hello,
I have this card agp 6600gt and a good cooling system (liquid, adapted hydrocool200ex).
I used a 20k variable resistor on the pin "u501" and the ground (my electronic knowledge is really poor, I suppose the ground is one of the black cable of the power sypply of the card, so I soldered there)
I decreased the variable resistance to 8,5k, I had no effects.
What the problem?
I hope to do an extreme overclock.....
Without any mod, with liquid cooling I have 600/1120 without artifacts.
Can someone explain the pencil method to a newbe as me?
best regards,
Antonio

Hi,
maybe the problem is the overheat of bridge chip.... maybe also this small chip is influenced by the mod, mine is really hot.
Gpu is cooled by a liquid system, the bridge chip by a small iron heatsink.
anyone can reply?

I got only 625 with 0,45ohm......... maybe is the bridge...

Hi. Sory 4 english :rolleyes:
I have Sparkle GF6600GT interfece AGP and i have problem. I must going higher clock on 600MHz on GPU but card sey not to me when i overclocking GPU on 605MHz. Help me to pencil vmod.

Quote:

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Originally Posted by DEVILEK

Hi. Sory 4 english :rolleyes:
I have Sparkle GF6600GT interfece AGP and i have problem. I must going higher clock on 600MHz on GPU but card sey not to me when i overclocking GPU on 605MHz. Help me to pencil vmod.

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If you need any help let me know.


I used a 5K rheostat connected here. The measured resistance before the mod was 418 Ohms.

http://www.aocb77.dsl.pipex.com/6600voltmod.jpg

My meter is pretty accurate. Adding just the 5K rheostat let me increase both the GPU and memory speeds for some reason.

These are the measured GPU voltages before mod at the capacitor. I'm not sure why my 2D voltage is so high. Possibly because I have 418 ohms instead of 500, but then the 3D voltage would be higher also but its not.

1.34 volts (2D)
1.45 volts (3D)

My MSI 6600GT AGP could do around 560/1.13 stable before the mod. The optimal test would detect 564/1.03 before the mod.

I lowered the resistance until I got;

1.54 volts (2D)
1.65 volts (3D)

After raising the voltages I tested the optimal overclock settings again and both memory and GPU went up to;

579/1.09

Then I tried to set them manual and I got around 579/1.19

What I noticed is even though the optimal test listed 579 on the GPU as being stable it wasn't stable I got artifacts. That's weird because the drivers list that speed as being OK and it really isn't. The memory seemed to be OK at the faster speed.


What I also noticed is even though I raised the memory from 1.13 to 1.19 with no artifacts. There wasn't really any improvement in benchmarks. So I don't think the GPU is very memory bandwidth limited at the speed I am running it at.

So I disconnected the mod for now and in the future when I get better cooling I might give it another try. My cooling now seems to be pretty good so I'm not sure if a better coolor would make a difference. It idles at around 46C and around 62C load. This is with the driver probe. I have an external probe also that reads 35C idle, 51C load. The external probe is touching the side of the GPU with thermal compound and is accurate to within 1C+-.

Heat is the culprit with the green trapazoidal shapes that appear after increasing the voltage. If I had my card clocked to high when it was stock, these would appear, esp. during the Troll test on 03 and to somewhat lesser degree on Nature. I did the pencil on both sides of the card, Gigabyte 6600gt, and they cleared up. So of course I would increase the speeds and they would reappear. At that point I put a strong 92mmx25 fan infront of the fan on the stock heat sink. It helped alot. Then I duct taped a fan from a TT-Volcano 6 cpu hs to the HS on the card. Anyone who had one of these knows they are abit loud but put out good air and pressure for their size. This coupled with the 92mm in front of that and some AS, it clocks much higher than stock and stays the same temps as far as I can tell. 46 - 47c idle. 600/1200. I moved the outer fan to reposition it during a 3DMark run and in a few seconds my screen looked like a green screen they use for special effects. Quickly replaceing the fan where it was removed the green patches. You have to have more cooling for the heat caused by the increased volts.

Quote:

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Originally Posted by coop

Heat is the culprit with the green trapazoidal shapes that appear after increasing the voltage. If I had my card clocked to high when it was stock, these would appear, esp. during the Troll test on 03 and to somewhat lesser degree on Nature. I did the pencil on both sides of the card, Gigabyte 6600gt, and they cleared up. So of course I would increase the speeds and they would reappear. At that point I put a strong 92mmx25 fan infront of the fan on the stock heat sink. It helped alot. Then I duct taped a fan from a TT-Volcano 6 cpu hs to the HS on the card. Anyone who had one of these knows they are abit loud but put out good air and pressure for their size. This coupled with the 92mm in front of that and some AS, it clocks much higher than stock and stays the same temps as far as I can tell. 46 - 47c idle. 600/1200. I moved the outer fan to reposition it during a 3DMark run and in a few seconds my screen looked like a green screen they use for special effects. Quickly replaceing the fan where it was removed the green patches. You have to have more cooling for the heat caused by the increased volts.

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So your temps stayed the same in the drivers with better cooling, but you didn't get the green artifacts anymore?

Yes, atm it is not pretty but it works. For some reason it won't go lower than 46-47. I switched hs with a zalman iceberg that was terrible, a forged Tiasol cpu cooler, and the best one was the stock one. That is all I had to work with. I did sand it slightly, put AS on the chip, and increase the tension on the springs slightly. I'm not sure that really did anything, but if you push down on a pot of water on the stove just as it starts to boil you can see the effect. I'm running at speeds that would not have been possible and with the fans can keep the artifacts from appearing. I will say that the room temp makes some difference and if I only use one fan the artifacts are in the first airplane test almost as soon as it starts. Cooling is key. Her is a pic of when I used one fan. Now I have the 60x60x25 duct taped to the front of the hs right over the stock fan. I tried with the stock fan in, out, on off, it works best on.

It looks like someone spilled a box of fans on your computer. :)

I think the idle temps are tough to get lower no matter what unless your using water cooling.

Have you tested the temperature at load? Because maybe with your extra fans your lowering the load temperature which would probably help with the green artifacts.

I know, and I agree about the fans and the lowering of the temps. I'm thinking of getting a water block. The chip seems to respond well to lower temps just from air cool.

Quote:

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Originally Posted by coop

I know, and I agree about the fans and the lowering of the temps. I'm thinking of getting a water block. The chip seems to respond well to lower temps just from air cool.

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I'm gonna have to try changing the fan on my MSI 6600GT. It looks I can take off the cover on the heatsink and screw an 80MM fan to the heatsink.

You can take it apart, the two push pins and the hs itself has screws to hold top and bottom together. The stock hs has been rather well thought out and designed I think it just needs a bigger stronger fan. The spacing of the holes in the card were a problem for me as far as attaching a different hs. They are just not spaced right. I even tried a NB hs from an LP B. It did not work very well at all. Good luck, keep sharp pointy things away and stay grounded. I almost ran a box cutter across mine trying to cut through a wire tie I used for one of the sinks :eek:

Quote:

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Originally Posted by coop

You can take it apart, the two push pins and the hs itself has screws to hold top and bottom together. The stock hs has been rather well thought out and designed I think it just needs a bigger stronger fan. The spacing of the holes in the card were a problem for me as far as attaching a different hs. They are just not spaced right. I even tried a NB hs from an LP B. It did not work very well at all. Good luck, keep sharp pointy things away and stay grounded. I almost ran a box cutter across mine trying to cut through a wire tie I used for one of the sinks :eek:

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I just modded it and it really didn't help anything.

This is what I did I took off the cover plate and removed the fan. That left me an empty area where the fan was. I found a scrap heatsink that I cut down to fit in the empty area. I attached the scrap heatsink to the empty space using Arctic Silver 5 and Arctic Silver thermal epoxy. Then I screwed an 80mm Smart Fan 2 to the heatsinks.
The card runs cooler but I still get the green triangle specks at higher voltages. Unless I run the smart fan 2 at full. I don't want to do that so lowered the voltages back down to default. I think the GPU is just limited.

That was kind of a good idea attaching another hs where the original fan was. You will need to have sufficent air though to make a diff. Did you do anything to increase the voltage to the mem or gpu? Also, I don't know how much the pcie to agp chip will affect what you are doing or wanting to do I should say.

Quote:

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Originally Posted by coop

That was kind of a good idea attaching another hs where the original fan was. You will need to have sufficent air though to make a diff. Did you do anything to increase the voltage to the mem or gpu? Also, I don't know how much the pcie to agp chip will affect what you are doing or wanting to do I should say.

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Kind of...lol? It was a good idea. :)

The more heatsink mass the better. It filled in the empty space pretty good. I put the Arctic Silver 5 right in the empty space right where the GPU would be, and then used Arctic Silver thermal epoxy on the rest. I have plenty of airflow because I attached an 80mm Smart Fan to the card when I was done.
I increased the voltage for the memory and GPU, and the fan helps but only if the fan is running at full blast or very high. There is no way I could take the fan running like that it makes too much noise.

I think the problem is the heatsink. It has to be either copper or well designed aluminum. Pure copper would perform so much better because it would absorb the heat faster. The MSI6600GT is aluminum or something like that....but its not copper for sure.

check your pm

Hi,

My Sparkle 6600GT was on reclamation and returned with another revision and layout. I`m lama in electrical things( and english too :-) ). Is there anyone, who know where I must apply pencil to increase voltage? I have searched all day long, and I find nothing, that looks like my card...

thanks for any answer

Is it always C37? Or isn't it :confused: . I'm a n00b in voltmods.

The Regulator chips where on the back on the previous GT's grab some shots of the back of the card.

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Originally Posted by DesertShooter

Is it always C37? Or isn't it :confused: . I'm a n00b in voltmods.

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I have found on my MEDION 6610XL (NV43 for PCI-Express.) the C37 too, but on the place, where should be a resistor, there are only two solder points. My PCB-Layout looks very strange, when it compare it with the Standard-PCI-Express PCB-Layout. It is a Special-Version from MSI of the 6600GT card for a big german company like DELL.

Could anybody help me and say defenitly, that C37 is the Point to put a Resistor on? I would start with 1 Kilo-Ohm ore more and slowly lower to the famous 550 Ohm in little Steps with OC- & Temperature-Checks beetween.

My Card goes powered by Infineon GDDR3 (128 MIB) up to 561 MHz GPU & 515 MHz VRAM (DDR1030) - from 400 MHz GPU & 400 MHz VRAM. I hope to hit 666 MHz GPU, the Card have a lot of potential. :D

P.S.: Please help me, all you VOLTMOD-Sepcialists.

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Originally Posted by TtecX

P.S.: Please help me, all you VOLTMOD-Sepcialists.

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Is there nobody online?

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Originally Posted by zakelwe

Here's the 6600 with both gpu and memory modded ( spot the two blue pots ) finally ended up at 635-645 core at 1.65v and 1231 memory at 2.15v.

http://www.aocb77.dsl.pipex.com/6600rig.jpg

Both vmem and vcore mods are very simple, the judgement comes with trading off temps with voltage on your cooling solution. Unless you have junked the stock heatsink I suggest you do not increases the voltage on the gpu much at all.

Regards

Andy

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can someone post the pic of the 6600GT agp vdimm mod please?

tnx,

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Originally Posted by Jort

can someone post the pic of the 6600GT agp vdimm mod please?

tnx,

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No, but I found this: http://sg.vr-zone.com/?i=1912
This applies to most 6600GT AGPs, including my XFX and it looks like the BFG as well. My resistor measured a little differently but I did the pencil trick and here are my results:

ohms on resistor (see the link above):
stock: 538 modded: 497

Stock: 1.458vcore
Modded: 1.566vcore

60ºC max under load, either way

nVidia 91.47
"Detect Optimal Frequencies" 2nd pass
Core: 585 Mem: 1.17Ghz (585mhz) < - stock
Core: 589 Mem: 1.18Ghz (590mhz) < - modded, yawn


GPU (stock volts, Mem@500mhz):
reached 616 before persistent artifacts
ATITool held at 595.90 artifact free (5+ mins)

GPU (1.566v, Mem@500mhz):
reached 633 before persistent artifacts
ATITool held at 617.13 artifact free (5+ mins)


Mem (stock volts, GPU@500mhz):
reached 615 before persistent artifacts
ATITool held at 604.48 artifact free (5+ mins)

I have yet to mod my vdimm but we'll see. I'd like to push the core even further just for kicks, but I might leave it alone to avoid a kick in the pants, instead :D