Well I put the 77X resistors on there, did the correct OCP mod, then adjusted the vmem to 1.86V and vgpu to 1.4V. I gained 30mhz core, 0 mhz shader, and 50mhz memory bringing me to 880/2100/2100 @ 57C loaded. Not too shabby for a free mod.
Printable View
Well I put the 77X resistors on there, did the correct OCP mod, then adjusted the vmem to 1.86V and vgpu to 1.4V. I gained 30mhz core, 0 mhz shader, and 50mhz memory bringing me to 880/2100/2100 @ 57C loaded. Not too shabby for a free mod.
Yes. I was stable at 1026 before modding, and after doing the vmem buck I was stable at 1056. After I cranked up the vcore I had to dial the memory back down to 1044.Quote:
Originally Posted by nvrmind
I wasn't sure if the 77X would work right, but like you said it's only 2%...it can't mess it up that bad. Glad you got it working! :up:Quote:
Originally Posted by babalouj
Do you think it's just the Quimonda chips that are benefiting from the vmem buck mod or Samsung and Hynix as well? I guess I could try pencil modding the memory to see if it responds to higher voltage and if not I could try the vmem buck mod. Kind of annoys me I'm losing like 50 mhz on the memory.
ok well i dont have the resistors i took off for the ocp mod i ended up losing them. i have an old motherboard. what do i need to measure to find new ones. can i just solder in one of the new ones since the stock ones are gone? i run 1.45 volts usually so i need the 1.2k like you say.
Its odd, I've been up to 1.45v on my MSI with no indication of the OVP activating. Doesn't seem to matter as my card won't clock any higher after 1.29v. What voltages are considered unsafe on these cards?
I'ts probably your ram getting too warm and causing the artifacts, which is why it doesn't do it right away.Quote:
Originally Posted by adpr_02
I have no idea about the Samsung or Hynix. I've been waiting for someone to post something. Your card is behaving like mine, though, so my 1st guess would be that vmem buck would help you. No way to know unless you try!Quote:
Originally Posted by nvrmind
They are 78X. If you see SMR's on your MoBo w/ the same label they might work. If not maybe you can find them online. Only way to measure resistors on the Mobo is to remove them first.Quote:
Originally Posted by natedog420
You don't need 1.2k for 1.45v. 3.8-4.2k would work fine for that. You shouldn't have any issues until ~1.625v idle w/ 3.8-4.2k.
Have you tried running AquaMark3? That seems to be a good stress test for OCP.Quote:
Originally Posted by nvrmind
I haven't tried AquaMark3. OVP doesn't seem to matter in my case since my card won't respond to higher than 1.29v. I was hoping to get the shader to around 2000, but 1825 seems to be it's limit. My card is one of the lower clocking cards I've seen on here. The voltage mod got me 90mhz on the core and 50 on the shader (800/1825). Not too bad, but I was hoping for more. Now if I can just figure out this memory issue.
I'll try the pencil mod first with these Hynix chips. If increasing mem voltage doesn't help, than I guess I'll go ahead with the vmem buck mod. I measured the voltage around 1.9v+.
This seems really odd, how do you know that more voltage doesn't help,ie what kind of crashing are you getting. Does your card still read voltage after it crashes?Quote:
Originally Posted by nvrmind
So if you use 1.2k, what kind of headway do you think you will get then like over 2v? I used the 1.2k on mine for around 2 weeks without problems, but finally decided to rma since ram never ran stock. I am going to do this mod again on my set of 8800gt now and I guess if they can be pushed to 1.625, then it seems there isn't any point to go all the way down to 1.2k. Seems like 3.8-4.2 will do that trick. I am looking for 1.55max, so you think 4.2k will do or will I need the 3.8(ie is 1.625 with 3.8 or 4.2?)Quote:
Originally Posted by jason4207
I've gone up to 1.45v. 3D06 locks up above 800/1825. The strange thing is though I've been able to run 800/2000 without artifacts on ATI tool @ 1.29v for an hour and I can play CS:S without lock ups. Other times CS:S will lock up as well. My multimeter will continue to read the correct once 3DMark crashes, which is why I don't think it's OVP. I've had very inconsistent results so far. Temps are just fine, load is 40C running ATI tool.
**EDIT**
I was just able to pass 3DM06 @ 800/2000/950 @ 1.29v. Very odd. The only thing I can think that made a difference was changing a bios setting. My Biostar TA770 A2+ has a GPU setting in the bios that puts a wattage limit on the PCI-E slot. The default setting is 75W. I changed it to 135W. Perhaps that setting has made the difference, as a volt modded 8800GT is definitely eating up more than 75W. I'll keep testing and report back.
nvrmind run AquaMark and see if it triggers OCP, thats about the easiest way of doing it.
Can you guys tell me how much difference there is between a vmodded GT and GTS at same clocks ? Which of these will score the highest in 3D06 ? I just want to know if its worth spending the extra $100+ per card .
Any help would be great.
:up:
Edit - looking at some of the clocks in this thread the GT clocks much better than my GTS , is there a brand/model of GT to look for ? One with better overclockability ? Better ram maybe ?
Cheers .
GTS has more SPs than the GT so it should be faster clock for clock. Also, GTS will OC higher than the GT.
As far as brands go, they're all reference cards, for the most part, so should OC about the same. It's all about luck of the draw.
I don't know the equation, but VJ told me 3.8-4.2k would give you 25% headroom. I know ~1.3v idle is where OCP kicks in, so 1.3 x 125% = 1.625v.Quote:
Originally Posted by scottc19
Largon said 1.2k gives you 50% headroom, so 1.3 x 150% = 1.95v.
I used 3.92k, but haven't gone any where near 1.625v yet, so I can't tell you for sure. I think you'll be fine for 1.55v w/ 3.92k or 3.8k if you want to be sure.
Someone correct me if my interpretation is flawed.
It varies from card to card. My GT did a little better on the core, but the GTS did a lot better on the shaders. The GTS has 3 phase power, so my gut tells me it would handle the increased voltage better. Also, the GTS does much better on memory clocks. At the same vGPU, and w/ tweaked memory my GTS scores 1200 points higher in 3DMark06 than my GT. Plus you don't really have to do the OCP mod on the GTS (unless your going extreme cooling).Quote:
Originally Posted by aussie-revhead
Ideally you want a GTS w/ Samsung memory. I have no idea how you'd be able to identify one, though. Perhaps a more recent date on the box would give you a better chance at getting the Samsung chips?
Is it just the new GTS that have a chance to come with samsung chips or the GT aswell?Quote:
Originally Posted by jason4207
That can't be the case. OCP can't be tripped at idle (theoretically it can but not in reality). Otherwise the card would trip at stock freqs and volts as soon as it enters 3D load.Quote:
Originally Posted by jason4207
-> OCP means that the phase controller monitors the amount of current that runs through the phases, once it detects the preset OCP-value has been exceeded the controller forces a shutdown on the mosfets. This means that in practice OCP can only activate under load.
Level of current that flows through the phases depends on three things thus OCP trip-point can be achieved only by increasing the following variables - unless the trip-point marker is altered ofcourse:
1. level of load
power consumption = C_device_constant * voltage^2 * freq
Variable "C_device_constant" varies according to the activity of the chip (= idle/load)
2. frequency
More clocks = more current draw
3. voltage
This is because the current draw of a device increases slightly as voltage is increased. In reality this has only a marginal effect.
We can't be sure since Primarion doesn't share the datasheet for PX3544, but I bet the equation isn't straightforward as this, and as stated previously, voltage doesn't affect OCP much.Quote:
Largon said 1.2k gives you 50% headroom, so 1.3 x 150% = 1.95v.
LOL...I didn't mean 1.3v idle triggers OCP, but that if you have ~1.3v idle then when loaded and under the right conditions OCP will kick in. I didn't give load voltages, b/c they tend to vary based on the program in my experience.
But, the rest of your write up puts things better in perspective. There is no absolute max voltage obtainable based on the R value of the SMR's used in the OCP mod. You also have to consider the higher frequencies you'll be running as well.
Can you estimate what values of R should be used for OCP override at different max voltages based on average clock speeds obtained at those voltages and assuming the worst case load?
Quote:
Example:
.
.
.
3.92k-->good to 1.55v as long as clocks are below 950
3.8k-->good to 1.6v as long as clocks are below 975
.
.
.
1.2k-->good to 2v as long as clocks are below 1200
.
.
.
jason4207,
Sorry, I have no idea...
:(
Damned Primarion, why do you sit on the datasheets?
Oh well. I guess one could just use a 3.92k SMR to be safer to start w/, and then if OCP becomes an issue at desired higher voltages and frequencies then one could just solder another 3.92k SMR on top of the other one effectively cutting the resistance to 1.96k.
SMR sandwich? Also from what I understand, the GTs do not really respond to voltages higher than 1.5v, so there isn't much of a point to go crazy on OCP.Quote:
Originally Posted by jason4207
Unless I misread something, which is entirely possible.:D
Quote:
Originally Posted by Mysterfix
Nop, downclocked it to below stock, and still got the artifacts. I then tried lowering the voltage to 1.2v and still got the artifacts.... Raising the voltage to 1.32 made me get a black screen very late in the game.... does the OVP mod actually work?
Could be a physical issue with your card. And yes, the OCP (not OVP) actually works.Quote:
Originally Posted by adpr_02
Are you using the stock cooling? I would take off the heatsink and check for good contact. I've had 2 older cards that acted like yours both had issues with the HSF not getting good contact.Quote:
Originally Posted by adpr_02
Yes, the mod works but it's for OCP (Over current protection) which kicks in waay before OVP.
A really easy way to check if it may be a heat issue is to turn off your computer for a few minutes to let the card cool down. Then fire it back up and start a bench loop. Time it to see how long it takes to artifact. After you've timed it from a cold boot try it with the card already warmed up. If it artifacts quicker when warm you know you have a heat issue.
Anyone know where the vGPU and vMEM read points for the Palit 1Gb 8800GT ?
Demo,
Yes. Need something to mark them on, like say, a pic of the card for example.
Quote:
Originally Posted by largon
I'll take pics. gimme a few mins.
http://xs124.xs.to/xs124/08085/dsc06056918.jpg
Lemme know if you need a closer view of a specific area, though my camera is a stone age point and shoot DSC-P200 sony.
Demo,
Red probe to one of the marked points, black to any ground:
Attachment 72751
Im getting 1.11 on idle, and 1.15 on loaded that means i already have the 1.1v in my "Extra" settings right ?
Appears so.
My card overclocks at an ultra crappy rate, i get a pink screen at 675core/1687shader mem wont move past stock ( 900 )
altho it doesnt lock up but shows a pink screen overlay, what could be causing this ?
Try the BIOS mod anyway. Perhaps you are getting a bad read w/ your DMM. I get readings of up to a 0.05v difference depending on where I put my ground probe.
Anyone found a hardmod for the Gigabyte non-ref card?
But seeing as how it overclocks now at a very low level, its not worth the hassle.Quote:
Originally Posted by jason4207
OK, so I finally bit the bullet and performed the vGPU mod. My RAM already does 1000MHz so the vRAM mods were not needed. I still need to do the OCP mod. With it as it is right now I can do 864/2000/2000 and all benches will complete. Without the OCP mod, you really have to "sweet spot" the voltage setting so not to trip the OCP while keeping stability. AM3 and 3dMark01 (yes 01) are helpful for this. Once 3dm01 hits the multi texturing test, voltage will spike due to the load. So right now I am running 1.295v idle and it goes up to 1.337v - 1.355v under load. 1.4v on the meter will trip the OCP and I get the black screen and 0 volts on the meter. I have to say though that while I am seeing better bench scores, the scores didn't scale like I was expecting. Still, this thing performs AWESOME! Thanks for all the tips. Now it's time to sell this and get a GTS, LOL!
If default vmem voltage is 2.0v, and you use a 20K resistor for the vmem mod what is the lowest and maximum voltage you will be able to achieve?
Seeing all the nice number people were getting, I finally decided to jump into the train. I bought a solder iron, DMM, all the hardware needed for the Vmod and a HR 03-GT to replace the stock cooler.
Everything wasn't smooth but at the end I finally managed to get it working.
Here is my max AT stable OC before the volt mod: 712/1728 @ 1.1V load temp 78*C
http://img89.imageshack.us/img89/735...1728950ew7.jpg
Here is my current max AT stable OC after the volt mod and the installation of the HR 03-GT 783/1890 @ 1.2V load temp 51*C
http://img99.imageshack.us/img99/460...7831890mb3.jpg
Picture of the moded card: (not very pretty but it does the job :p)
http://img86.imageshack.us/img86/882...tmod033fo4.jpg
Turns out pretty good for a 1st volt mod and considering that I had never soldered anything before. :D
A big thanks to the extremesystems forum members for all the useful information that gave me the guts to do it and particularly to Largon for the volt mod and to Thrilla to post this awesome soldering guide: http://www.xtremesystems.org/forums/...d.php?t=115387 :up:
LOL wow, I mounted my VR on the same corner! And the Molex connector is a MUST. Good job on your first volt mod!
Thanks :)Quote:
Originally Posted by Renegade5399
I actually took both ideas (molex and VR placement) from pictures posted on this forum (maybe yours :D ).
This is the advantage to have many skilled people here: it avoids beginners to make too much mistake and allows to know great tips :up:
I've continued my testing and succeeds to run 10 loops of Crysis GPU benchmark and 2 loops of 3dmark06 at 799/1998/975 @ 1.2V idle.
This card definitely needed better cooling and more volts to shine :cool:
After finding the max OC at 1.2V idle, I'll try up to 1.3V
does that vGpu mod also work for the Gigabyte Turboforce cards? the ones that go to 1.2V with software...Quote:
Originally Posted by clockero
Hey Guys,
I have some havy problemes with the Mod on the First Page.
I have a Point of View 88GT with Reference design Board.
I solder a 500kOhm Resistor to the left Alternativ Point (I was much easyer than the Point in the Middle.
The Mods Works good ... so long...
I can tune up and down the Voltage
and I can raise the Clock BUT
If I get more than 1,3 V the Card freezes i everey Benchmark.
Under 1.3 V all is ok and I can Bench but the advantage with the Clock is not good 770 without mod 780 with 1,3 V more is not possible.
Can someone Help me?
Is it possible that the Mod works better on the middle Soldering Point?
I was wondering can I use 1.2k fixed resistor something like this?Quote:
Originally Posted by largon
http://www.queenmao.com.tw/image_pro...007-Carbon.jpg
500kohm? Is that a typing error?Quote:
Originally Posted by Kabauterman
The VR one is supposed to be 500ohm, not 500kohm (kilo-ohm).All marked mod soldering points are equal.Quote:
Is it possible that the Mod works better on the middle Soldering Point?
Yes.Quote:
Originally Posted by quake6
Ohh ^^ yes I mean 500 ohm ...Quote:
Originally Posted by largon
I think I have find the Problem
I must do the OCP mod :-(
Yeah thats the OCP kicking in, drop some 3.92k in parallel on the caps next to the X78s and you'll be set. There should be some pictures to help you in this thread.Quote:
Originally Posted by Kabauterman
Yesterday, I wanted to see how high I could go on the voltage. I went all the way up to 1.35V idle, giving me slightly over 1.4V under Ati tool load, the clock being 848/2106 and the OCP still didn't kick in :confused:
Is it possible the OCP is not working on my card ?
What is a 24/7 safe voltage knowing that my card stay cool, always under 55 under load ?
I don't think we know for sure what the max is... a few people have killed there cards, but this may be due to some other reasons and the fur benchmark...Quote:
Originally Posted by r4st4m4n
I have mine at 1.5v load and am doing fine... but take your risks as I am also on water... ~41C or less on load... Also with these high volts the mosofets get really hot, you have to have heatsinks on all of them and a fan!
Yes, I have the PWM heatsink budled with HR-03 GT on them.Quote:
Originally Posted by scottc19
I have the fan of the HR 03-GT blowing upwards to the ram sink / mofsets sinks, an intake fan in the front of the case, another intake fan on the side of the case at the level of the card centered on the GPU and a 3rd 80 mm exhaust fan zip tied on the empty PCI brackets under the one used by the card. Not really quiet but I believe it should give plenty of airflow to the mosfets. :D
I probably won't go as high as you. I think 1.35~1.4V is the maximum I'm willing to go. If you run 1.5V 24/7 on water, I guess 1.4V should be ok for air.
It seems some cards scale better than others. I still have to do the OCP mod, but had to wait for my resistors to arrive. That will come shortly. For now I have to work within the limits of the OCP. I am able to set 1.3v idle and under load it goes up to about 1.337-1.35v. When running AM3 or 3dm01, anything over 1.386v will trip the OCP. This is not too bad for me however as I am able to run 864/2106/1062 bench AND CS:S/TF2/COD4/Crysis stable. The card will cut out after about 2 hours of Crysis though due to the OCP. Something must get warm and cause current draw to go up. No biggie though as I will fix that soon.
So here's a shot of my fastest ever Lightsmark 2007 run:
http://www.cyberimpressions.net/imag...smarkXPVM4.jpg
Have you run AquaMark3?Quote:
Originally Posted by r4st4m4n
I just downloaded it yesterday and tested the spike created when idle Vcore is 1.2V. But it seems Crysis demo make the voltage going higher than Aquamark 3 :rolleyes:Quote:
Originally Posted by jason4207
I've also tested 3dmark01 and the test 8 or 9 (can't remember exactly the name) is what makes the voltage going higher by far. While any other test including Crysis bench only make the voltage go up to +0.055, this test make the voltage jumps up to +0.08 :eek:
I'll try tonight to set idle Vcore at 1.35V and run the 3dmark01 test, if it doesn't make the OCP kick in, I think nothing else will and I'm not willing to go higher on voltage anyways.
Yesterday I was a little bored to run benchmarks, so I tested the stability by playing Crysis. So far it seems 784/1944 is stable at 1.2V. At least it is after 1+ hour of Crysis. :up:
Havent got around to pictures yet, but managed to bench the xfx card that I brought back from the dead... hit 1720 in 3dmark06 :)
http://service.futuremark.com/result...eResultType=14
core 885, shader 2219, ram 1026, 1.56v ---for benching
q6600 @3.82 1.59
24/7 870/2100/1000 1.5
3.8 1.57
Scottc: nice results, always great to see some hardware resurrected from the Xtreme graveyard :rocker:
Does your's have the Samsung mem? How does it respond to more/less volts?
The voltage may spike higher, but OCP relates to current, not voltage.Quote:
Originally Posted by r4st4m4n
Try running AM3 w/ 1.35v idle, and see what happens.
Any 8800gs vmod results yet?
No samsung mem, the mem on this card really sux tho :( i did the vmem buck mod and found best at 1.84. 1026mhz is not 24/7stable, it is barely stable enough to make it through 3dmark... it iappears to be 100% stable at 1k tho.Quote:
Originally Posted by NonDecepticon
Complete GeForce 8800 GS/GT/GTS Voltmods for reference PCB @ techPowerUp!
And how do I connect them? Like this? Or reverse end on resistor?
http://shrani.si/t/1p/NS/VU0nF3k/g92gtsocps.jpg
http://shrani.si/t/2o/Wu/30y80R6L/1/qm-r-007-carbon.jpg
Could someone measure their card´s Vgpu and Vmem mods resistance with everything soldered. Measured from soldering points.
quake6,
It doesn't matter as resistors work both ways.
Indeed running AM3 at 1.35V is the winner :p:Quote:
Originally Posted by jason4207
It could complete the test at 846/2106 @ 1.3V idle (spike at the end going slightly over 1.35V) but it couldn't at 1.35V idle. At the end of the benchmark the voltage went slightly over 1.4V and it did trigger the OCP.
Anyway 1.3V idle is good enough for me ... at least for the moment ;)
Excellent write-up! :clap: :up:Quote:
Originally Posted by largon
Bookmarked for future reference.
I did notice that on the reverse vmem mod you used a different location for one of the solder points than the one VJ showed me (shown in yellow below). But, it may be that VJ's solder point, and yours are electrically the same.
Sorry but what does "reverse v-mem" means?
It means lowering the vmem voltage instead of increasing it. Read the guide and it will explain it better.Quote:
Originally Posted by aoch88
Hi guys,
I don't have a VR but a 470ohms fixed resistor, could someone tell me what would be the vGPU with that res ? I'll solder if it makes me get something like 1.2-1.35v.
Why void the warrant for these vga cards:eek:Quote:
Originally Posted by wittekakker
All you guys need is Nibitor, it will save you a lots of stress. 1.5v can be done without pencil or soldering resistor. Read out your cards bios with the said program, go to tool and use the voltage editor, to choose your volts. Then flash your new bios with a bootable disk(floppy) with nvflash exe.
Pros: vga card is overclocked without using riva and ati tool, less load on cpu and rock stable ocs, while gaming and benching:yepp: .
Think about it and am ready to help out if someone wants to give it a shot.
Farthest you can BIOS volt mod is 1.1v, no matter what you set it to.
Please read all of this thread:
http://www.xtremesystems.org/forums/...d.php?t=164242
have someone a link to a simple understandalbe picture for 88GT (Rev Design) OVP mod???
There are so Many other Pictures and threads and my english is not so good
Just do vgpu and OCP,OVP isn't required
what is OCP for 8800 GT i have only see the OCP Pic from GTS
but the GT hasn't all of this resistors
For OCP mod on the GT all you have to do is solder (in parallel) a 3.8-4.2K Ω SMR across the SMC next to the 78X chips. It's just like the GTS only there is 2 SMCs on the GT vs 3 on the GTS due to having one less phase on the GT.Quote:
Originally Posted by Kabauterman
Here is a pic:
http://img.photobucket.com/albums/v7...0stuff/OCP.jpg
Let me know if you have any more questions.
I am doing this mod tonite. I am SO close to 900 core, it's disgusting. I can get 880 on 1.35v load, but the card will cut out at the end of AM3 due to OCP.
Hi
I did the vgpu, the reverse v-mem and the OCP mod weeks ago. My Card does 753/1782/1053 (Core/Shader/ram) at 1,13V Load. No Artifacts in ATi Toll and no reboots or graphic errors. Also 792/1890/1053 at 1,17-1,18 are stable in crysis for a day playing. Now i set the voltage at 1,21 Volt Load and the card got unstable in crysis. With every voltage I got over 1,19V Load the card craps out in Crysis. So I tuned up the voltage and tune down the Clocks on stock, but it didnot work. Should I do the OVP Mod to get over 1,19V ? Thank you ceph
Just do OCP,OVP hit the card only at 1.7v as far as I know
I will make a deal with you send me your bios and the equally write out the settings you want, just core speed, mem speed and what voltage you need. I will mod your bios with these new setting and i will asure you they will work like a charm.:yepp:Quote:
Originally Posted by Renegade5399
I modded a BFG 8800 GT 740mhz core, 1835 shader and 1000mhz mem at 1.3v and i donīt want to push it further becos. the card donīt belong to me(father inlaw).
Did you measure the voltage with a DMM ? Could we know how you do that ?Quote:
Originally Posted by Shocker003
Maybe you can put the explanation in the 8800 GT bios mod thread as it would be more its place ;) : http://www.xtremesystems.org/forums/...61#post2807561
I would be interested to know how you did since some people already tried without success ... even mavke, the developer of nibitor.
What resistor value is needed to get 1.3vGPU ?
Please verify this with a meter before you go claiming this works. Especially considering that at 1.3v I can hit 850MHz on the core. 740 is about average for stock volts.Quote:
Originally Posted by Shocker003
QFT.Quote:
Originally Posted by r4st4m4n
OK on another note, the OCP mod was a great success! I used 1/4 watt 2.2kohm resistors from Radio Shack. I soldered wire leads to them and soldered the leads to the caps in question. It's not pretty, but it got the resistors out of the way. I will snap some pics tomorrow night. Now for the results! I finally hit that mystical 900MHz on the core. The voltage is set to 1.45v at load. It sits at about 1.397v idle. Load temp never breaks 34°C under the MAZE4.
http://www.cyberimpressions.net/imag...smarkXPVM5.jpg
Thanks to everyone (especially largon) for all the tips!
I and several others have tried this. All your doing is changing the VID label. You are not changing the actual VID. VID03 = 1.1v no matter what you change the label to.Quote:
Originally Posted by Shocker003
740/1835/1000 is a typical OC w/ the 1.1v BIOS mod.
There is no VID04 or higher as this would be the only way to go higher. I have even tried modifying the BIOS to add in VID04, VID05, etc. There is room in the code to add these values, but the problem still exists b/c the chip doesn't recognize anything above VID03.
Hey guys,
I do the OCP mod for my 8800 GT 512 MB Rev design
i don't have fixed resistors so I use 2 25kohm VRs and aetup them to 4 kOhm.
http://img528.imageshack.us/img528/5264/vmofcc8.jpg
Is that a problem or will it works to?
vGPU is a 500 ohm vr.
I hope I have done all what I need to clock my GPU higher :-)
without voltage limitations
Very clean job there. I see people like that back corner for the vGPU pot. Using the variables on the OCP mod is fine and actually may be a benefit to you. I used fixed 2.2kohm resistors on my OCP mod. Not to mention mine does not look nearly as neat and tidy as yours. You will be able to clock just fine! Now get to it!Quote:
Originally Posted by Kabauterman
Well i didn´t check the volts with any voltimeter, but here is a screen shot of what i did with the bios and like i said eariler this card is not mine. I could have tested more with it if i had the chance.Quote:
Originally Posted by jason4207
Meanwhile i can increase the core to 850mhz but it´s pointless, like i said eariler i don´t own a 8800GT:(
I did the OCP mod and it works bekause i can run the end of the Aquamark with 1,4V Load but all volts over 1,20 doesnot work and crysis will freez no matter which clock is set.Quote:
Originally Posted by quake6
I'm thinking of getting a Galaxy 8800GT and I get to know the vGPU mod needs 500 ohm VR. Now, do I set it at 500ohm and reducing it would give higher voltage or it's the other way round?
Maybe you didnt do right...Quote:
I did the OCP mod and it works bekause i can run the end of the Aquamark with 1,4V Load but all volts over 1,20 doesnt work and crysis will freez no matter which clock is set.
With 520ohm is about 1.15v as far as I rememberQuote:
I'm thinking of getting a Galaxy 8800GT and I get to know the vGPU mod needs 500 ohm VR. Now, do I set it at 500ohm and reducing it would give higher voltage or it's the other way round?
Thanks quake6 :) I'll set it around +/- 500ohm for a start. Btw, I shall put the red measuring point on my multimeter to the vGPU measuring point then the black one anywhere on my casing?
How much will 330ohm give?
That is correct, you might want to stuff the black probe into a ground of an unused molex connector. Better contact there. ;)Quote:
Originally Posted by aoch88
Probably nothing noticeable - but it's really better to start from 500Ω and tune down.Quote:
How much will 330ohm give?
Dont know,didnt measure... Put multimeter red wire on red measuring point and black wire anywhere to ground (example molex connector)
EDIT: Largon is just too fast :p:
Thanks all :) What's the default vGPU and vMem? I searched through my bag of VR's and resistor and have a 1K VR which I can use for vGPU but I don't have a 20K VR. Would 10K work or its a bit too low?
same problem qith my OCP mod :-(Quote:
Originally Posted by Ceph
I solder 2 25kohm VRs (setup to 4 kOhm) across the 2 SMDs
but all over 1,2 V Freezes in the test :-( no matter what Clocks I setup
The Soldering points have contact and I do all what the Pictures say
Can someone help to tell me where I should twist my multimeter to read the voltage for the 8800GT? My knowledge in electrics is somewhat limited and I don't know which is AC/DC by the symbols :(
http://planet.time.net.my/klcc/alvinn1/multimeter.jpg
Also, can I use 10K ohm for Vmem? I hope 10K wouldn't generate too much voltage increase.
20 on the V-. left side on the dmm
Quote:
Originally Posted by Kabauterman
How can I measure if i did the mod right? I solder a 3,92 KOhm on the 2 SMD.
You can use math and a DMM.
The original resistance is 1.29k, and your putting a 3.92k in parallel, so using this link we can calculate that the resistance should be ~971 after the mod.
yes one have a resistence of 9,1 and the other 4,00
Quote:
Originally Posted by jason4207
Thanks a lot! I tried the OCP mod once again and it works. One resistor seemed to be over heated (My soldering skills arenot very high). Now with the new one the card does very well. I will try some new clocks!
What resistance to use,can I use 1.2k ohm? Or it is better to use 2.2k ohm or? For OCP...What is better for higher clocks and voltage?
I need some help here. I bought a Galaxy 8800GT with dual slot cooler and the PCB layout is totally different from nVidia reference board. To make it even worse, it isn't the same as the Galaxy board which we can find in this thread.
I wonder if anyone else have the same card and how do I volt-mod it? It has the jumper and I've set it to what is supposed to be 1.3V but using the multi meter to get the vGPU reading also doesn't work.
It comes with Samsung RAMs so I've no idea if that is better compared to Qimonda? Someone give me a clue please :(
http://planet.time.net.my/klcc/alvin...xy/galaxy1.jpg
http://planet.time.net.my/klcc/alvin...xy/galaxy2.jpg
http://planet.time.net.my/klcc/alvin...xy/galaxy3.jpg
http://planet.time.net.my/klcc/alvin...xy/galaxy4.jpg
http://planet.time.net.my/klcc/alvin...xy/galaxy5.jpg
http://planet.time.net.my/klcc/alvin...xy/galaxy6.jpg
Let's see a ss of 850 running please. :rolleyes:Quote:
Originally Posted by Shocker003
I've been working on that card for some time now.Quote:
Originally Posted by aoch88
;)
On that galaxy, you should be able to do a minor volt mod with just the jumper by the power connectors.