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HD6950 safe clock speeds

post #1 of 7
Thread Starter 
I got my HD6950 flashed to a HD6970.

Core clock is running at 900.
And memory clock speed at 1375.

I raised my core clock to 950
and memory clock to 1400.

I tested it 2 minutes later my screen freezed.

I want to ask, should i keep these clock speed that i have now, or can i increase it a little more ?

Does somebody have running his flashed HD6950 at those clock speeds ???
Perhaps my memory became unstable frown.gif.. Core is the same as the core from a HD6970...

Sry for my bad english.
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post #2 of 7
You probably just need to up the voltage to get it stable.
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post #3 of 7
what is a good voltage for 6950s flashed at that speed, usually default is 1.175, should up it to 1.2?
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post #4 of 7
Are you using a HD 6970 bios? You should use a modified 6950 instead. The 6970 bios may kill your card (as it runs the memory at higher voltage than the spec it's meant to run at).
    
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post #5 of 7
Thread Starter 
Yea i already thought so, but I flashed it on the PowerTech way, now i can't increase or decrease my GPU voltage....
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post #6 of 7
Quote:
Originally Posted by thrgk;12766373 
what is a good voltage for 6950s flashed at that speed, usually default is 1.175, should up it to 1.2?

I would raise it by 0.01V until it's stable.

Quote:
Originally Posted by AMD/ATI 
I want to ask, should i keep these clock speed that i have now, or can i increase it a little more ?

I usually pick a resonable voltage to start with, say +0.1V above stock. In the 6950's case, that's 1.2V. Leave memory at stock 1250MHz. Start raising the core speed by 10MHz until it crashes. Back down 10-20MHz and that's your stable clock.

Ex: ..., 890 pass, 900 pass, 910 pass, 920 pass, 930 pass, 940 fail -- back down to 920 for your stable core overclock.

Now that you've found your stable core speed, it's time to bring up the mem speed. Start raising mem speed by 20MHz until it artifacts or crashes. Back down 20-40MHz and that's your stable memory speed.

Ex: ..., 1340 pass, 1360 pass, 1380 pass, 1400 pass, 1420 fail -- back down to 1380 for your stable mem overclock.

My usual stability test it to run the Crysis: Warhead benchmark 99 times on max settings. If it completes, I consider it stable for 24/7 gaming. I've ran furmark for 24H and had Crysis crash within 5M so that's why I prefer to use Crysis for stability testing.

If you want to tweak more...
Now that you've found your max stable overclock of 920/1380, it's time to find the lowest voltage for that clock speed. We already know it's stable at 1.2V. From here I usually lower voltage 0.01V until it's unstable and then raise it 0.01V.

Ex: ..., 1.2V pass, 1.19V pass, 1.18V pass, 1.17V pass, 1.16V fail -- raise it up to 1.18V for your lowest voltage for 920/138.


Don't start plugging in those numbers, I MADE THEM UP! Instead, use this method to find your own numbers.

Enjoy!
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post #7 of 7
Thread Starter 
Ok thanks for the information ! I will Try smile.gif.

The memory from a HD6950 is different than the memory from a HD6970.

So increasing the memory from my HD6950 to much, is that not to dangerous .. ?

@Razi3l, Yes im using the HD6970 bios, but everything runs great, no crashes or artifacts...
Edited by AMD/ATI - 3/17/11 at 9:18am
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