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Water Cooled 8800 Ultra OC Advice

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1138

Registered
Joined
Dec 27, 2007
I have my EVGA 8800 Ultra water cooled and would like to try to overclock it. What is a reasonable amount to overclock the 8800 Ultra without damaging it, I'd like it to last 2-3 years?


(EVGA 8800),(Core),(Memory),(Shader)
Stock, 612, 1080, 1.51
KO, 636, 1125, 1.63
Superclocked, 655, 1125, 1.66

gpuID.jpg
 

ChinStrap

Member
Joined
Sep 17, 2006
Location
Cedar Rapids, IA
most will do 702rop (core) stable.

the core revision on the Ultra is an 'A3' where as the GTX's got the 'A2' - the A3's have shown the ability to clock greater then 700core on AIR @ stock voltage quite frequently. i had an 'A3' cored GTS (g80) that i could bench @ 729core with an upped fan speed duty cycle. since your on water i would think 700 would be a good place to start.
 

jason4207

Senior Member
Joined
Nov 26, 2005
Location
Concord, NC
You're not going to damage anything just by OCing. Volt-modding is a bit risky, though.

Your covered under warranty for just OCing, though.

See what she'll do!

Should be able to get at least 700 on the core I think.

Edit: too slow on the 700 comment.
 
OP
1

1138

Registered
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Dec 27, 2007
I used RivaTuner to set my card to Superclocked specs 655 GPU, 1125 MEM, 1.66 Shader and got 14345 3DMarks.

Thanks, I'll try 700 on the GPU. Is it better to link the GPU and the Shader? Can the Shader handle 1729MHz?

gpuID.jpg
superclocked%20unlinked.jpg
 
OP
1

1138

Registered
Joined
Dec 27, 2007
700 seems ok 14732 3DMarks this time with the GPU & shader linked. GPU temp was 47-48C MAX. during Unreal Tournament III and it is 81.5F in my office.
700.jpg
superclocked%20unlinked.jpg
gpuID.jpg
 

Surfrider77

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Jan 24, 2006
Location
Abroad...
I had my Superclocked running at 705, but had Rivatuner upping my fan speed. Your watercooled should do considerably better... and quieter! :D
 
OP
1

1138

Registered
Joined
Dec 27, 2007
712 & 730 passed a 3DMark06 run, but 750 locked up on 3DMark06.:bang head 730 GPU Temp was only 49C under load, Do I need to read about more volts?:) I like the 18.0 GPixel/s & 50.4 GTexel/s numbers.:drool:

750%201125%201666.jpg
730%201666%201125.jpg
712.jpg
 

ChinStrap

Member
Joined
Sep 17, 2006
Location
Cedar Rapids, IA
729rop was the highest i could get my 'A3' cored GTS (g80) to bench stable on AIR with fan speed at 100% - i think unless you hardmod the GPU 729 is the highest she will go. but hey, 729 overclocked Vs. 612 stock - not to bad IMO. :beer:
 
OP
1

1138

Registered
Joined
Dec 27, 2007
The hardware monitoring in RivaTuner is not showing what I set the GPU/shader/mem to but gpuz is. Which one is correct?:confused:

rivatuner.jpg
740%201200%201760.jpg


Here is what I have them set on.......Which app is correct???
gpu%20oc.jpg
 

jason4207

Senior Member
Joined
Nov 26, 2005
Location
Concord, NC
RT Hardware Monitor is correct. These cards are based on a 27MHz crystal, so clock speeds jump up in factors or multiples of 27. Sometimes you have to move the slider quite a bit to get to the next step.

I'm not sure why GPU-Z reports incorrectly.