8800GT voltage mods

[GoldenTiger]

Evga SSC is @ home on the table waiting. Will have some prelim numbers up tonight with vGPU and vMEM mods using an MCW-60 water block and Swiftech H20-220, single loop on GPU.

:cheers:

Edit: and some pictures, finally I get to use the Canon 40D on computer parts, should be a good night.

AWESOME, can't wait for your post!

[cowie]

For VGPU, 500 Ohm VR is really good, almost no overvolting, less then with 8800GTS/X

hows your results?

[Jigsaw]

how heat sensitive are the resisotrs you solder to in order to read voltages?

[GoldenTiger]

So anyone with the mod done have any results clock-wise? I see a couple of people who have watercooling/aftermarket air-cooling hitting upward of 770-800mhz core without the mod, I'm darn curious how high these will go with more voltage.

[breakfromyou]

Will a VF-900cu be able to handle the wrath of G92?

stock/vmodded...either? no? maybe?

[GoldenTiger]

Stock, pretty well but it will probably max out... vmodded, not so sure .

[metro.cl]

Got some good news and some bad news.

Bad news is, the variable resistor I've laying around seem to be dying

Good news: this is what caused the modification not to work. Had some more time today to find out what really went wrong, just got another VR on it today é voila, variable GPU voltage

No need for me to paint it out, Largon's picture is allready clear enough, VSEN+ to ground

Have fun

Sorry to ask but which of both legs is Vsense+? could you upload a picture of the modded card.

Regards

[VETDRMS]

Hey, no 500ohm VRs around like I thought.

Stock metered voltages on SSC are vGPU-1.107 at desktop, 1.137 loaded; vMem-1.995.

With MCW-60 can run 800mhz core at 29-30C loaded.

Sorry, out of time, pics ect to follow this weekend.

[metro.cl]

11Ω (or 15Ω?) between vSense pin and ground is a horribly low resistance. I was expecting something around 45Ω since G80GTS/GTX which measures to 35Ω output 1.28v, and since the GT has lower vGPU thus the sense resistance should be higher than those on GTS/GTX as all use the same PWM IC. <20Ω is very low and IMO somwhat suspicious...

If someone is willing to be a guinea pig then I would suggest soldering a 500Ω multiturn VR between this point and ground. Before soldering measure the resistance between soldering points (should be ~15Ω), set VR at max resistance (500Ω), solder the VR, measure resistance between soldering points (should be ~14.5Ω, if much less don't turn the card on) tune down for more vGPU.

Damn i found a couple of VR but i think they are not good for the mod i got a 50kΩ and a 10kΩ VR here.

i'll have to find 500Ω VR but i think it will be hard

[VETDRMS]

I will probably just order a few from McMaster.

Someone asked about the SSC bios, and I think it was in this thread, so I attached it. The voltage identifier is 1.05 like the normal 8800. However, my vGPU and vMem are higher than normal.

[wittekakker]

hows your results?

Unfortunately this card aint mine, just did a quick research so to please the OC-community. No results, but I can tell you that I could increase to 1,2VGPU. Anyway, XS counts enough people owning such card, it will not take too long before those cards are running at 1GHz I suppose

Sorry to ask but which of both legs is Vsense+? could you upload a picture of the modded card.

Didn't picture it, you will have to take me on my word here
Vsen+ is the pin marked below:

[cowie]

so it only works to pin right??

[largon]

No, all these spots work.
If not, there's something wrong with the VR/other equipment.

[nordicpc]

Heat is a killer on my card at least. On the first 3D '06 run I hit 83c. I pulled off the HSF and applied AS5, got down to 75c on the second run. I almost burnt my finger on the heatsink though. I guess those NVIDIA engineers who have been saying "We're good to 100c" are pushing it a bit here.

Needless to say, the card was very stable at 700mhz core, and ran through a '06 pass as high as 733. I couldn't get much more out of it without doing better cooling and maybe this volt-mod. We'll just have to see how the cores do with about 1.2v.

[Diverge]

Heat is a killer on my card at least. On the first 3D '06 run I hit 83c. I pulled off the HSF and applied AS5, got down to 75c on the second run. I almost burnt my finger on the heatsink though. I guess those NVIDIA engineers who have been saying "We're good to 100c" are pushing it a bit here.

Needless to say, the card was very stable at 700mhz core, and ran through a '06 pass as high as 733. I couldn't get much more out of it without doing better cooling and maybe this volt-mod. We'll just have to see how the cores do with about 1.2v.

i have no heat issues what so ever with my stock cooler, even overclocked >770/1800/1000. I think my last 3dmark run peaked at 72°C. The only thing you have to do to keep the heat down is max the fan @100%... of course it sounds like a hair dryer then, but i only do that for 3dmark runs.

edit: sorry to go off topic (volt mods)

[nosleep]

The problem is definitely the Overvolt Protection. The 8600gt/gts can hit 1000 core with volt mod's and no OVP.

[trans am]

lets see a shot of someones modded card.

[GoldenTiger]

The problem is definitely the Overvolt Protection. The 8600gt/gts can hit 1000 core with volt mod's and no OVP.

Didn't see anyone with a problem with OVP yet, can you link the post you're saying has the problem ?

[georgesod]

Well, are there any results yet?

[nosleep]

Didn't see anyone with a problem with OVP yet, can you link the post you're saying has the problem ?

Meant to post this in the 8800GTS thread

my bird

still though, I wouldn't be surprised if these GT's are restricted by the OVP

[cowie]

yes i see its working
last night i tryed but to no luck
i seen today that my ground wire was off.
testing 1.29 load now
thank you from me and the others who dont thank but use
best wishes
cow

[96redformula]

So what are you all hitting with increased volts?

[dinos22]

yes i see its working
last night i tryed but to no luck
i seen today that my ground wire was off.
testing 1.29 load now
thank you from me and the others who dont thank but use
best wishes
cow

hey cowie

are you planning to put it on dry ice

if so are you able to tell us how much droop there is

also can you also let us know where the OVP limit is at if you are brave or crazy enough to stick a lot of volts into it....hence why i asked if you're on DICE

[cowie]

well i just had it at 1.55 3d and 3c
no blacksreen and i did not get the clocks i thuoght i might hit only benchmark stable at 810-825.
but its only been a few hrs
i'll start slow and backdown for 24/7 to 1.28 that did not effect temps much but gained me 50mgz on core
i just play around not going for the kill to early

[dinos22]

how much drop and droop are you seeing

1.55V LOL

what cooling are you on