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This sound about average for 6950 oc?

post #1 of 8
Thread Starter 
Hi all,
Just wanting to check, does the following sound about right for a 6950 overclock? And if so, how else might I go about improving it further, if I can and it's fun and achieveable to do so that is?

Core is at 930MHz
Memory is at 1305MHz
Power is +20%
Voltage is at 1.100v (default)

Temperature under the GPUtool stress test (I think it's called that anyway) reaches around 65C average, no artifacts or crashing in that or games I've been playing for the past few hours.

http://3dmark.com/3dmv/3590753?show_...J6i1DKB2STdSFg is a 3DMark Vantage, bear in mind the CPU speed is showing as if it were idle.
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post #2 of 8
I don't know about the 3D mark score because I haven't done it myself, but I overclocked my 6950 to 900/1325 just using CCC and it's stable with no artifacts and goes up to about 68C so yeah that sounds normal. What setting did you change for power +20% ? Were you able to achieve a higher overclock after changing that? Also, did you use MSI Afterburner or something else to oc it?
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post #3 of 8
Thread Starter 
Quote:
Originally Posted by KraziKarl View Post
I don't know about the 3D mark score because I haven't done it myself, but I overclocked my 6950 to 900/1325 just using CCC and it's stable with no artifacts and goes up to about 68C so yeah that sounds normal. What setting did you change for power +20% ? Were you able to achieve a higher overclock after changing that? Also, did you use MSI Afterburner or something else to oc it?
There's an option for altering the power between -20 and +20 in the overdrive options, I didn't check to see if it made a difference to the max clock I could get, but I have read that it has an effect on throttling higher clocks under certain conditions, so I went with just increasing them to +20 which is 20% above normal powertune limit.

I have used both CCC and Afterburner, and GPUTool initially as a stability test, then gaming and/or 3DMark Vantage afterwards.
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post #4 of 8
Its an OK overclock, you can easely reach higher if you add more voltage.
You can go up to a voltage of 1.25v if you manage to stay under about 85 degrees

With 1.1v i get 950/1280mhz with 1.18v i get 1010/1280mhz

just slowly add more voltage and up the clocks, constantly monitor your temperatures.

* keep power at +20% or you will get throttling under heavy load
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post #5 of 8
Thread Starter 
Quote:
Originally Posted by Farih View Post
Its an OK overclock, you can easely reach higher if you add more voltage.
You can go up to a voltage of 1.25v if you manage to stay under about 85 degrees

With 1.1v i get 950/1280mhz with 1.18v i get 1010/1280mhz

just slowly add more voltage and up the clocks, constantly monitor your temperatures.

* keep power at +20% or you will get throttling under heavy load
I see. I noticed your memory clock is lower, I was wondering, as from past experience and reading, if really increasing the memory clock is worth doing and mainly increase the core clock since that yields noticable results?
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post #6 of 8
Keep your memory stock and overclock the core first.
When you reach the clockspeed where you want to be you can start adjusting the memory.. well thats how i do it..
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post #7 of 8
that sounds about right. With my card i can do 1000 core if i max out the voltage at 1.2v and my memory won't go above 1400. Although at anything higher than 950 there is very little performance increase.
post #8 of 8
Thread Starter 
I see, one final question then.

What do you generally use to put pressure on the card for stability test? I'm finding GPUTool's stability test a bit sensitive, where things like Vantage, Team Fortress 2, and other games/programs seem to work fine, GPUTool produces some pixel errors every so often.
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