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Seasonic X650 for i7 970 + 6970 CFX - Page 3

post #21 of 38
you have a reply from Phaedrus. that's all you need tbh
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post #22 of 38
Quote:
Originally Posted by Phoenixlight View Post
No but I have an even better PSU: Corsair AX750 and I wouldn't risk running two HD6970's in crossfire with it.
Im sorry but it is foolish to believe that it can't handle 2 6970s.

And If I go by PSU calculators, I would need a 800W PSU to power my sig rig...
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CMLXXX - RAMPAGE
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post #23 of 38
are psu calculators really that bad? ive used them in the past, but i always buy a psu that is a bit more than the recommended wattage. this way i have head room for future upgrades.

is it all psu calculators that are bad? or just some?
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post #24 of 38
Based on the scale, 6970cf draws about 430w. That x650 unit can pull almost 54a/648w on 12v so it should be fine but watch out if you start adding more components.
post #25 of 38
Quote:
Originally Posted by Phoenixlight View Post
Why would you divide the result by 2?
Because Newegg's PSU calculator overestimates by about that much. They do have a vested interest in selling you a more expensive power supply, I'm sure you can see.


Quote:
No but I have an even better PSU: Corsair AX750 and I wouldn't risk running two HD6970's in crossfire with it.
It's the same exact thing, except yours has slightly higher rated silicon. You could run said Crossfire setup with ease.
Edited by Phaedrus2129 - 1/25/11 at 5:12pm
post #26 of 38
Quote:
Originally Posted by AliceInChains View Post
are psu calculators really that bad? ive used them in the past, but i always buy a psu that is a bit more than the recommended wattage. this way i have head room for future upgrades.

is it all psu calculators that are bad? or just some?
Some are worse than others. The stock extreme.outervision one is the "best", but if you leave it at the regular settings it will overestimate by about 10-20% for both minimum and recommended wattage. And if you screw with the TDP and % load settings it will tell you up to 50% more than you need.
post #27 of 38
Quote:
Originally Posted by Phoenixlight View Post
No but I have an even better PSU: Corsair AX750 and I wouldn't risk running two HD6970's in crossfire with it.
That's because you don't know any better (not trying to be rude but it's true).

Quote:
Originally Posted by Phoenixlight View Post
What else is there to use?
Your own brain.
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post #28 of 38
Thread Starter 
Okay guys... so I've upgraded to an unlocked 6950 with +20% PowerTune and a heavy overclock. When I fold and run Furmark Xtreme Burning Mode simultaneously, my kill-a-watt reports about 650W of consumption. Multiply that by the ~90% efficiency of my PSU at that level and I get 585W of DC output.

Is my X650 going to be able to handle a 2nd unlocked 6950? I know it's capable of pushing 780W, but a 2nd graphics card would push the load even beyond that. Possibly 850-900W. What I'm really interested in is something like a 140% overload test on the X650 to see just how far it can go above its rating. I recall it handling the 120% overload test without breaking a sweat (still well over 80% efficiency).
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post #29 of 38
Quote:
Originally Posted by aznofazns View Post
Okay guys... so I've upgraded to an unlocked 6950 with +20% PowerTune and a heavy overclock. When I fold and run Furmark Xtreme Burning Mode simultaneously, my kill-a-watt reports about 650W of consumption. Multiply that by the ~90% efficiency of my PSU at that level and I get 585W of DC output.

Is my X650 going to be able to handle a 2nd unlocked 6950? I know it's capable of pushing 780W, but a 2nd graphics card would push the load even beyond that. Possibly 850-900W. What I'm really interested in is something like a 140% overload test on the X650 to see just how far it can go above its rating. I recall it handling the 120% overload test without breaking a sweat (still well over 80% efficiency).
try and see if it explodes. if it does we know its not possible to run crossfire 6950's and a hexacore on a 650W PSU.....
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post #30 of 38
Thread Starter 
Quote:
Originally Posted by wumpus View Post
try and see if it explodes. if it does we know its not possible to run crossfire 6950's and a hexacore on a 650W PSU.....


You make me a sad, sad panda.
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