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Will a 650W PSU be enough to run crossfire 6950's?

post #1 of 10
Thread Starter 
I just recently built my parents a new computer. It has a 2500k, hdd, ssd, 16 gb of memory, and currently 1 6950 (1 gb model). I used to have crossfire 6950's, but put one of them in their new build. I just pulled the trigger on a 7970 a few minutes ago, so I was thinking of giving them my other 6950 so they could crossfire them.

My dad loves civ5 and was blown away at the level of detail when I cranked the settings up with their new build. I want to give them my 6950, but the problem is I wasn't planning on setting up a crossfire rig for them, so the computer only has a 650W PSU. It is this exact model (Corsair TX650):

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139020

I know a 650 W psu would be cutting it pretty close for this system. What do you guys think, would it be enough? Or would a new PSU be required as well? Thanks a lot!
post #2 of 10
Yep, it'll be fine.
    
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post #3 of 10
^Agreed.
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post #4 of 10
i agree with mrTOOSHORT, it should be fine.. the corsair TX series are nice PSU's too smile.gif
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post #5 of 10
Thread Starter 
Awesome! That's exactly what I was hoping to hear. I'll go ahead and give it a shot then, and if it doesn't work I can always get them a better PSU.

One more question, how will I know if the 650W isn't enough? Will the computer crash, artifact, or what?
post #6 of 10
I belive that a light will appear on a card and the fan will spin rapidly or at least thats what happened to me
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post #7 of 10
Quote:
Originally Posted by gregr507 View Post

Awesome! That's exactly what I was hoping to hear. I'll go ahead and give it a shot then, and if it doesn't work I can always get them a better PSU.
One more question, how will I know if the 650W isn't enough? Will the computer crash, artifact, or what?

It will generally just black screen crash. I was overloading my old PSU and it would just crash straight up, and leave no information in the error report that is usually generated by crashes (that give enough time to generate a complete one).
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post #8 of 10
Computer will reset when you stress the cards, like loading up a game.
    
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post #9 of 10
Thread Starter 
I'll be sure to watch for any signs of instability. Just ordered a kill-a-watt to see what the actual power draw is, to be on the safe side.

Btw you guys rock, thanks so much for the quick responses. I'm sure my dad will love it
post #10 of 10
With a kill-a-watt you need to take into account efficiency.
If your PSU is only 80% efficient then youll be pulling around 780W at the wall for 650W used by the PC.

But 650W is plenty for games. You'll just be getting close to the limit if your stress testings with Furmark and Prime at the same time.
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