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Should this be possible???

post #1 of 4
Thread Starter 
to push my 5970 to 1000Mhz on the core???, i got it to 900Mhz stable with the memory at 1185Mhz, using the XFX overvolt tool, so the voltages are

Core: 1.1625

Mem: 1.15

My temps on the 2 GPUs are :

GPU1: 34c
GPU2: 33c

and the vddc's for each gpu are:

VDDC's for GPU1: between 63c and 73c
VDDC's for GPU2: between 92c and 95c

if anybody can help me hit 1000Mhz on both GPU's stable it would be much appreciated.

Thanks

Martin

Ok so since i typed this without changing anything the VDDC temps actually got quite a bit hotter (running furmark btw in full screen so utilising both GPU'S)


VDDC GPU1 : 73c to 84c
VDDC GPU2 : 102c TO 104c
Edited by Badass1982 - 1/30/11 at 11:09am
post #2 of 4
Each GPU should be able to clock to 1GHZ but considering thermals and power I'm not too sure. I had numerous 5770s past 1GHZ with no volts so it could be possible. Even if you just got GPU1 to 1GHZ and left the second at 900Mhz it should make a difference. 95c seems a bit high IMO.

I'm not to knowledgeable on dual GPU cards, sorry.
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post #3 of 4
Thread Starter 
is there any ratio i should stick to regarding memory clock to GPU clock or not? i mean i have no problem dropping the mem clocks slightly if i can get the cores to 1 gig!
post #4 of 4
Start with stock memory settings. Increase one GPU1 10MHZ at a time and test for artifacts. Once you reach maximum without artifacts drop the MHZ by 10 or 20 and leave it for stability. Then go to GPU2 and do the same.

Once you have both of your GPUs stable increase memory 10MHZ at a time and scan for artifacts. Find the maximum and then drop it 10-20mhz for stability.

If one GPU core clocks higher while being stable then it's OK. Not every GPU die is going to clock the same and a 1GHZ core and a 900MHZ core is going to help vs a 900/900MHZ clock.

If you try to do it all at once it's going to be hell to figure out what is crashing/artifacting the card. Take your time and do it right.

Also watch thermals. You don't want to see above 100C a core in furmark or other bench unless you don't care about the card and just doing it for fun. I say 100C because gaming is less intensive and you should load @ lower temps but you need to "engineer" for worst case.

With voltages you'll eventually hit a wall in where higher voltages will result in a lower clock. Don't expect more voltage will always let you clock higher. If you previously volted your cores in tandem I'd reset to stock and start over again one core at a time. You'll find one core clocks higher or lower vs the other core @ different voltages on your card which is normal. For example: if you have one core lower voltage than another stable at the same speed it'll decrease temps and lead to a overall higher/stable clock.

Good luck!
Edited by zorrobyte - 1/30/11 at 11:35am
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