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Overclock 6870 past 1000Mhz....how? - Page 3

post #21 of 40
Thread Starter 
Tried it out and it works as you stated, except that the frequency of the 2nd card stays at whatever OC I set it to, which in this case was 1050Mhz on the core and 1150 on the mem.
Looks like it's a case of doing this when benching only.
Thanks for the assist BTW smile.gif.
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post #22 of 40
Just leave it at 1000. There isn't really a way to change the voltages. Dual 6870s are most likely bottlenecked by your chip, as well. ( not by alot)

Just be happy with 1000.
post #23 of 40
Thread Starter 
Quote:
Originally Posted by SpeedNuggeT;12278117 
Dual 6870s are most likely bottlenecked by your chip, as well. ( not by alot)
I would not have thought that. 6 cores running at 4Ghz I would think is ample?
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post #24 of 40
wait 1000 on stock volts?! hax!

I am struggling for 999MHz 1.3v right now.
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post #25 of 40
Thread Starter 
Quote:
Originally Posted by reflex99;12278238 
wait 1000 on stock volts?! hax!

I am struggling for 999MHz 1.3v right now.

Piece of cake smile.gif. Water cooled.
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post #26 of 40
I have aftermarket cooler.

1000 on stock volts is insane. You have cards of the gods.
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post #27 of 40
I have been playing with my CF 6870s also. I was able to reach 1000 core 1200 mem @ 1.2V, but as soon as I go over 1000 core, I'm getting alot of artifacts even at 1.3V. I also had to give IOH core more volts so I wouldnt BSOD during overclocks.
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post #28 of 40
Thread Starter 
Quote:
Originally Posted by reflex99;12278316 
I have aftermarket cooler.

1000 on stock volts is insane. You have cards of the gods.

Got lucky, I guess smile.gif.
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post #29 of 40
Quote:
Originally Posted by crunchie;12278062 
Tried it out and it works as you stated, except that the frequency of the 2nd card stays at whatever OC I set it to, which in this case was 1050Mhz on the core and 1150 on the mem.
Looks like it's a case of doing this when benching only.
Thanks for the assist BTW smile.gif.

Remember that I told you that the second card ramps up, this is what I was talking about.

Once you run a 3D app the second card will sort itself out, Run GPU Z with the sensors tab open and check the second card. It will say 100% load.
Then run Furmark on the benchmark then check out the usage of the second card it will drop back down to 0% once the benchmark is finished.

Also I just discovered, that CCC lies about the usage. I checked the sensors in GPUz and it reads 0% load for both cards, also another point every time you set something in Trixx and apply it, it turns off manual fan control in CCC so you need to turn that back on in.
Other than that it's all smoke and mirrors about the load on the GPU.

Quote:
Originally Posted by SpeedNuggeT;12278117 
Just leave it at 1000. There isn't really a way to change the voltages. Dual 6870s are most likely bottlenecked by your chip, as well. ( not by alot)

Just be happy with 1000.

That's funny I just set the voltage just then, worked fine for me.

Also his CPU is no more a bottle neck than yours.
Edited by smash_mouth01 - 2/5/11 at 8:39pm
post #30 of 40
Quote:
Originally Posted by smash_mouth01;12278517 
Remember that I told you that the second card ramps up, this is what I was talking about.

Once you run a 3D app the second card will sort itself out, Run GPU Z with the sensors tab open and check the second card. It will say 100% load.
Then run Furmark on the benchmark then check out the usage of the second card it will drop back down to 0% once the benchmark is finished.

Also I just discovered, that CCC lies about the usage. I checked the sensors in GPUz and it reads 0% load for both cards, also another point every time you set something in Trixx and apply it, it turns off manual fan control in CCC so you need to turn that back on in.
Other than that it's all smoke and mirrors about the load on the GPU.




That's funny I just set the voltage just then, worked fine for me.

Also his CPU is no more a bottle neck than yours.

I never stated my CPU isn't bottlenecking my card. I am sharing my experiences, based on my previous 5970. My 1055T at 4ghz bottlenecked a 5970 quite a bit.
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