8800GT voltage mods

[alexio]

I did the vMEM mod and at 1.95v loaded I can now do DDR2200+ 24/7 with 1.4ns Samsung timings (have Samsung chips on my card). I'll do the vGPU mod tomorrow and play a little with it. I'll really push it later on when I've bought tools for my Dremel to cut some old heatsinks to pieces.



Using an old stylograph and some silver glue I drew a line from one of the vMEM mod points. At the end of the line I made a little "pool" of silver glue by pushing the tip of the pen a little harder to the PCB. Then I hotglued the wire from the vRES in the right place making sure the exposed copper of the wire was dipping in the "pool" of silver glue. Afterwards I added another layer of glue to ensure proper conductivity of the connection.

I prefer silver glue over traditional soldering

[natedog420]

I did the vMEM mod and at 1.95v loaded I can now do DDR2200+ 24/7 with 1.4ns Samsung timings (have Samsung chips on my card). I'll do the vGPU mod tomorrow and play a little with it. I'll really push it later on when I've bought tools for my Dremel to cut some old heatsinks to pieces.



Using an old stylograph and some silver glue I drew a line from one of the vMEM mod points. At the end of the line I made a little "pool" of silver glue by pushing the tip of the pen a little harder to the PCB. Then I hotglued the wire from the vRES in the right place making sure the exposed copper of the wire was dipping in the "pool" of silver glue. Afterwards I added another layer of glue to ensure proper conductivity of the connection.

I prefer silver glue over traditional soldering

what the hell is that mod lol. please do tell what you just did. ty

[alexio]

what the hell is that mod lol. please do tell what you just did. ty

Don't mind where the red wire ends (it has no purpose in mijn explanation, it just goes to one of the ground points on the PCB like it does normally). What I did is make the mods a little easier by diverting the solder points for the mods to an area on the PCB that isn't so crowded with components. I'm not sure if you can solder a wire to silver glue (although I think it's possible) but I used silver glue for connecting the wires.

Hot glue is even more permanent than soldering

Maybe my glue sticks are different than yours but I can easily remove a dot of this glue from a PCB (tried this on an old PCB before using it on the GT).

[natedog420]

could someone post a pic of the mod that lowers your memory voltage. i dont think ive seen that pic before. thanks

[jae215]

could someone post a pic of the mod that lowers your memory voltage. i dont think ive seen that pic before. thanks

I would like to know this as well. A written explanation of the mod would work too. thanks buddies

[Deluge]

Well, I attempted to save my GT, and it's not happening. The solder points are way too close together. I e-mailed XFX to ask if it's possible for them to fix it at my cost, but I kind of doubt they'd be able to - missing resistors and traces burnt from the rescue attempt, and all. What do you guys think? Maybe I'll just grab a cheapo eVGA for a while and step up when I have some cash.

@ Scott - PM me if you're still interested in it, I'm obviously not looking for too much.

[Nosfer@tu]

I like that iron. I see it for less than $20 online. I may have to order it. What temp do you set it to? I've always just used a cheap RadioShack 15W.

To get your core over 756 you just need to increase your shader clock a little. Just a few steps. It won't by any means limit your max core OC if you turn up the shaders just a bit. I don't know why it does this, but it is an easy work-around.

You should, we are attualy quite a few with it, and it has exchangable points 2.

I normaly set it at just above 65 % of max temp, But I have no problems using it at max = 50 Watt.

That is what I think you pay 150 $ for, the fact that the iron is hot on EVERY angle of the solder point. So somtimes if you need a specific angle of soldering you migth find it to cold and just turning it to maximum fixes that

I think I have done around 90-140 Vmods with this soldering iron.
Only I and Riska does comercial vmodding here in denmark. Not that I have that much work

Maybe once a month

I prefer silver glue over traditional soldering

Well using hot glue is somthing I strongly recommend NOT to.
How will you remove it? Just use sealstring or normal tape!

Hot glue is even more permanent than soldering

[Pacha]

I just bought my 8800 GT, Twintech, reference design with new fan.

no gaymonda, it has Samsung chips


I did the vgpu mod, and I must say I did pretty bad this time. the little metal button under the primarion chip just came out with the wire when I pulled it accidentally, I tried to put it back but without great success, so in the end I almost owned everything in this area, indeed the abrasive grease I use also add some brown color to the solder (see the ground one) but still... it looks pretty gay


anyway, it works like a charm

[jason4207]

Do you plan on doing either of the vmem mods? I'm curious if you can get any better results than the Qimonda chips at higher or lower voltages.

I've got another GT sitting here..eVGA. I'm hoping it has Samsung chips, but I'm not holding my breath. I'll be taking it apart here in the next few days. I think I'm going to put the HS from my GTS on it, and just up the volts to 1.25v idle or so. Also, tweak the RAM, and throw OCP on there just in case I want to get crazy w/ it later.

[Pacha]

Do you plan on doing either of the vmem mods? I'm curious if you can get any better results than the Qimonda chips at higher or lower voltages.

I've got another GT sitting here..eVGA. I'm hoping it has Samsung chips, but I'm not holding my breath. I'll be taking it apart here in the next few days. I think I'm going to put the HS from my GTS on it, and just up the volts to 1.25v idle or so. Also, tweak the RAM, and throw OCP on there just in case I want to get crazy w/ it later.

I must say I'm quite upset of soldering on tiny electrical parts right now.
I saw on the samsung chips datasheet that it is rated at 1.9V ±0.1V so it may be overvolted at 2.0V (didn't checked it with mm though, I just forgot), like qimonda is.
My previous vdd mod on samsung chips never turned very useful, it always went bad creating artifacts like mad after some time. However, it helped to increase vdd to get a little bit higher clocks so I hope the stock voltage on this one will help to get good clocks.
Besides, I'm rather focusing on fabricating a new fixation for my wb and cutting sinks.

[jason4207]

Fair enough. I'd like to see how well your memory OCs at stock, though, if you don't mind. Can you make sure to test w/ the BoP-03, and CF-05 loops, so I can get a baseline of how your Samsung's do against my Qimonda's?

[Pacha]

sure I'll do some 2k3 and 2k5 loops, but I'll post it only when I'll have finished to prepare the card, and for now I have to buy some Ø 2 mm * 50 screws or build it myself with nuts and thread stalk, and also a square bar, my current one is too short.
I'm also waiting for the fan I ordered to put on the mosfets and some rams, plus I don't have my saw right here to cut the nb sink for the other rams so it won't be before the end of the week

[jason4207]

sure I'll do some 2k3 and 2k5 loops, but I'll post it only when I'll have finished to prepare the card, and for now I have to buy some Ø 2 mm * 50 screws or build it myself with nuts and thread stalk, and also a square bar, my current one is too short.
I'm also waiting for the fan I ordered to put on the mosfets and some rams, plus I don't have my saw right here to cut the nb sink for the other rams so it won't be before the end of the week

No rush.

Do you paraglide? I've been doing it for almost 14 years, but I'll admit I haven't been up much in the past couple of years. Hopefully, this summer I can get some flights in.

[Pacha]

No rush.

Do you paraglide? I've been doing it for almost 14 years, but I'll admit I haven't been up much in the past couple of years. Hopefully, this summer I can get some flights in.

Indeed yes, this is me on my avatar with my Advance Epsilon 5. I'm much more a beginner than you if you've been flying for 14 years, I've only 105 flights, though I've been flying for about 7 years.
I fly during summer exclusively in the Alps of France (around Annecy if you heard about it). I'm flying this summer too

[Hazaro]

Pacha! Your poor poor GT!

[Pacha]

Pacha! Your poor poor GT!

what do you mean?

[Robilar]

I have a pair of asus 8800gt. I took off the stock coolers for a pair of thermaltake duorbs and saw that there is an uncovered jumper in the upper right hand corner of each card.

any ideas what this does?

[XSS]

Can any here make a mod for my card i will give more core an mem !
It is a Gainward 88GT non reference




Mercie

[natedog420]

its the same as the mods in the first post. everything looks to be in the same spot for the most part. look at the first post. theres a pic there.

edit: the vgpu ic seems to be in the right spot just labeled different. the memory ic is right below it and looks to be the right 2 spots. just figure out witch way ur vgpu ic id facing and use the first pic so u get it right. its a little different so look close.

[hias]

hey guys,

i have a gainward 8800gt, stable @ 830/2023/1000 (62.92.12.00.04 bios and about 1,305V vgpu in vista). still on default cooler, but soon on accelero s1

my mem timings are very tight, but my qimonda chips are doing quite bad, i think.

well, i read somewhere here, that these qimonda chips perform better @ 1,9V.
Does anybody know a vmod, to lower vmem from 2,0V to 1,9V ?

Greetings

[jason4207]

hey guys,

i have a gainward 8800gt, stable @ 830/2023/1000 (62.92.12.00.04 bios and about 1,305V vgpu in vista). still on default cooler, but soon on accelero s1

my mem timings are very tight, but my qimonda chips are doing quite bad, i think.

well, i read somewhere here, that these qimonda chips perform better @ 1,9V.
Does anybody know a vmod, to lower vmem from 2,0V to 1,9V ?

Greetings

Go back to my post 592, and look at the vmem buck mod. Use a 50k VR, and tune to max resistance to start. You'll have to play around to find the sweetspot. Read some of my previous posts on the matter. This last GT liked 1.8v, the previous liked 1.84v, and some guy said his liked 1.78v.

[opc]

Hi Guys

I just finished the Vgpu mod on my two SLI’d XFX 8000GT’s late last night, and I thought I’d share my results here. I took a bunch of pictures along the way, and I have a pretty extensive electronics background, so if there is enough interest I can post up a full step-by-step guide with pictures. It seems like there are a handful of people on here who really know their stuff, and another handful of people who shouldn’t be allowed near a working toaster, let alone a $300 video card. Hopefully I can write up a guide that could help the people in between

Now for the results:

Pre-mod I had what amounted to a set of dud cards. I’m not sure if the SLI configuration makes things less stable, but the pair of cards couldn’t reliably break 675MHz. Both cards were on DD Maze5 waterblocks with idle temps between 18-22C and load temps between 28-30C with the help of a dryer vent and a very cold Canadian winter. Basically, there was no excuse for their poor results. I actually returned one of the cards after finding out that it couldn’t even run reliably at the stock 900MHz mem clock. I got the exact same pixilated crashed discussed earlier in this thread. I had to scale the mem clock back to 870 just to get reliable play time in Bioshock.

The Vgpu mod has certainly been a saving grace for both these cards. I’ve run the voltage up to a conservative 1.276V measured and adjusted under load from ATItool. Both cards are currently happy at 800gpu/1000mem, which is exactly where I wanted them to begin with. I’m sure they could go higher, but to be honest, I just wanted them to perform reliably at a solid clock speed. I’m not willing to trade stability for another 60MHz.

My core temps have gone up 1C at idle and 2C under full load, which still keeps them below 35C at the highest. I have a bunch of ram-sinks all over the cards, covering the memory and mosfets, and a single 80mm fan blowing over the power supply end of the card. Everything is cool to the touch, except the RAM at the far end of the card, and the little SOIC chip on the bottom of the card, which is pretty toasty as well.

I was hoping that by keeping the cards below 1.3V under load, I could avoid the OCP mod, and so far it looks like I’m alright. I’ll perform some longer stability tests and report back on the outcome. I have a pile of SM resistors hanging around, so I guess if worse comes to worse I might give the OCP mod a shot.

Now, I have a quick question for anyone who is familiar with 3DM06. I’m finding that my scores for the video cards are really sub-par compared to what I’ve been seeing on here. I did a run with a single card fully stock, and the 2.0/3.0 scores were 4815/4915 respectively. At 800/1000, a single card pulls a more respectable 5650/5860, but I was expecting to be well into the mid 6000’s at that clock speed. What’s even worse is that the SLI’d pair turn in even more pathetic results. With two cards at 800/1000, and a Q6600 at stock clocks, I get an embarrassing 13696. I’ve had the processor up at 3.2GHz, and that helped quite a bit with the overall score, but the SM2.0/3.0 scores are still poor for the cards, regardless of where the processor is at. I’m running a 122-CK-NF63-TR motherboard with the latest 169.21 drivers. (there’s a 122-CK-NF68-A1 in the mail right now, so that should help with the Q6600) Any suggestions would be welcome!

[largon]

Can any here make a mod for my card i will give more core an mem !
It is a Gainward 88GT non reference

I'm going to need a clear macro shot covering just the area of the vGPU and vMEM controllers (RT8802A and RT9259A respectively) in order to see the controllers' pin and PCB traces. After that, some measurements.

its the same as the mods in the first post. (...)

The controller chip is a totally different IC from a different manufacturer so it's very likely the mod 1st post doesn't work.

i have a gainward 8800gt (...)
Does anybody know a vmod, to lower vmem from 2,0V to 1,9V ?

Is your card the same as XXS' card?

Go back to my post 592, and look at the vmem buck mod. (...)

Again, it's likely a different controller.

[Pacha]

largon, just let me ask you how do you figure all the mods for the different PCBs? I guess you have an advanced knowledge in electronics and usually try to find out how the circuitry work seeing the datasheets on manufacturers' websites, and then find out how to mod it. At this point, what do you do exactly do to know what to solder and such? just calculate the theorical // res after adding one at the good place and then the new voltage?

Or maybe you have a buddy who is electronic engineer for nvidia?

[XSS]

So here are a any Pictures , better macro i can´t make i have a Canon Z710















XSS