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post #11 of 35
I think a 650w psu is pushing it close.
    
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post #12 of 35
Quote:
Originally Posted by MrWhiteRX7 View Post

I think a 650w psu is pushing it close.

Minimum 750 for CF 6950's
post #13 of 35
Me and my mate ran 2 6950s with 6970 bios in CF and BF3 ran on ultra with 4xaa and all the jizz perfectly, even on B2K maps it didn't dip below 60 on 1080p. I'd say your PSU is inadequate.

What are other specs? Can you fill in your rig.

673
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post #14 of 35
Thread Starter 
Quote:
Originally Posted by ErOR View Post

Me and my mate ran 2 6950s with 6970 bios in CF and BF3 ran on ultra with 4xaa and all the jizz perfectly, even on B2K maps it didn't dip below 60 on 1080p. I'd say your PSU is inadequate.
What are other specs? Can you fill in your rig.
673

ugh....is there a way for you test if your psu is not cutting it.here are my specs. again thanks for the inputs!

i5 2500k OC'd to 4.2ghz with 212+ cooler
16gb RAM
128gb SSD
win 7 64bit

again im running this on stock clock (no 6970 bios). just my cpu thats OC.
post #15 of 35
Ive done testing with 2 6950's and they only use like 630w with p95 and furmark running and that was with both cards running like 1.3v 1020/1500mhz.
    
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post #16 of 35
Quote:
Originally Posted by microman View Post

Ive done testing with 2 6950's and they only use like 630w with p95 and furmark running and that was with both cards running like 1.3v 1020/1500mhz.

And that's counting the rest of the system? Also we're assuming his psu is legitimately putting out a steady 650w then.
    
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post #17 of 35
Thats including 12 fans 2 ssd and 1 hdd 2 pumps and a 2600k@5ghz . Playing bf3 only uses about 400w
    
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post #18 of 35
Impressive, you have the most economic gaming rig around then biggrin.gif

Mine was hitting low gpu usage in BF3 with 2 msi 6950 2gb OC'd to 950/1500 1.25v with a 750w psu... Once I switched out to my current 1000w I was getting almost 100% both cards. Nothing else changed. I didn't actually change the psu because of this reason, but it's something I noticed immediately.
    
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post #19 of 35

http://www.overclock.net/t/1194674/650-watt-enough-for-2x-6950s

 

 Quote:

 Originally Posted by microman View Post

ok i turned off HT and put my chip at 4ghz like you said then put pcs +20% on both cards and ran furmark and prime95 on and i was pulling 683 watts from the wall.

 

 

Quote:

Originally Posted by microman View Post

Ive done testing with 2 6950's and they only use like 630w with p95 and furmark running and that was with both cards running like 1.3v 1020/1500mhz.

 

 

That's like saying "OP, you are fine to run 100% capacity of your 650W PSU. You will be fine because I am not using 650W for the test but a 1000W PSU. Again you are fine OP with your 650W PSU".

 


2 6950's 1.3v 1020/1500mhz <~~~~~ amazing chips

 

 

 

 

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post #20 of 35
Factor in efficiency i am posting this from my phone so i am pulling from my memory. I will get out of bed and make a video for you all.
    
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