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8800GTX GPU Volt Mod with Apogee 176mhz o/c Stable

post #1 of 18
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Even though I did the gpu volt mod on my 8800gtx just before the holidays, due to the holiday I didn't really get to play around with it until this morning (last night) and though I had also placed a pelt against the core and the waterblock, my worries were confirmed that I have previously ruined my good pelt by experimenting with heatsinks. I took the pelt back out and even though I was only using a waterblock now (apogee) I got some great results.

The smr in the picture is smaller than it seems. I used a tiny wire from an 80 conductor ide cable, and the smr is about the same width. I practiced soldering again some before modding the card and found that tinning is very important in this situation. I had never tried a tinning pad before and instead of solder beads sometimes repelling from contacts until they get really hot, tinning the iron made it want to latch on to everything.





After adding two wires for the voltage test spots I put the card back together (without the pelt after a test run) and started creeping up the voltage in .0125 increments. This got boring and I turned the gpu voltage to 1.4v. A stable clock frequency 736mhz is achieved.



For a couple of hours I slowly increased the voltage when it is needed to keep the gpu stable, and I end up with at 1.552v gpu. Any higher than this did not seem to increase stability as it should, even though at 1.6v temps did not break 50c. At 1.552v gpu, 752mhz core is achieved completely stable and benchmarkable. At this same voltage, 779mhz is achieved and seems to be stable, but 3dmark scores are lower, as if there is some strap issue, or perhaps not enough volts / high temps.



I think my cpu is holding me back a little. When I get some more watercooling gear, I should be able to get just a bit more I tried pencil modding the memory again, and got only artifacts once more. Guess I just have bad luck with vga memory.


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post #2 of 18
Thread Starter 
A few more images....

I can't get 3dmark to publish anything on my ga-965p-s3, drivers I guess.

A 750ohm trimmer was used for the gpu mod.


752 / 1007 mhz runs completely stable with games and benches


779mhz core is stable, but 3dmark06 score goes down some. I don't know why yet.



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post #3 of 18
may i ask why you would want to overclock a 8800 ?
    
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post #4 of 18
Quote:
Originally Posted by dkdeath View Post
may i ask why you would want to overclock a 8800 ?
because he can.....why else?
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post #5 of 18
Thread Starter 
Quote:
Originally Posted by dkdeath View Post
may i ask why you would want to overclock a 8800 ?
For fun, and for high fps.

It's like gambling
    
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post #6 of 18
Quote:
Originally Posted by Mister Crowley View Post
For fun, and for high fps.

It's like gambling
but it's already bottlenecked by your CPU you wil probably not see any performance gain.
post #7 of 18
Thread Starter 
Quote:
Originally Posted by {core2duo}werd View Post
but it's already bottlenecked by your CPU you wil probably not see any performance gain.
This is not true. Right now my cpu is holding my score back a bit for sure, but going from a 676mhz gpu to 752mhz gpu (stock is 576mhz) at the same 3.2ghz e6600, I gained over 650 points in 3dmark06. I think with a second waterblock and radiator, it should go over 13000.




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post #8 of 18
well dam man, takes some balls to do that. I think its fast enough, but 779mhz on the core? thats just crazy. I might try my hand in this when I finally get my GTX waterblock.
    
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post #9 of 18
That does take balls.....you a crazy mad foo!
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post #10 of 18
wait holy cow.. those are bigger and longer than i thought and it reqiares 2 sli bridges.. omg !



sorry to go off topic!
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