Will a "Corsair Powersupply 750W" run two 3870x2 in crossfire?

Will a "Corsair Powersupply 750W" run two 3870x2 in crossfire?

cant find any info about this anywhere

Under load a single 3870x2 consumes 270-290W. Idle is around 140W.

290W x 2 = 580W

As long as your PC can function on the remaining 170W, you'll be ok. I'm also pretty sure Corsair rates their PSU's as a constant draw as opposed to the peak.

As of now, I wouldn't recommend stressing the PSU like that. You're basically trying to run 4 GPU's off 750W. Tri-SLI with Ultra's recommends at least 1KW (Although, it can be done a 850W PSU).

List your specs for a more definitive answer.

more about the PSU please...if it cant push the amps, it wont run

Go here, and check it out http://www.extreme.outervision.com [...] orlite.jsp

I'm not sure where you are getting your info but it's a bit off. Our PSU guy working with ATI has already gotten Crossfire certification with these cards and the TX-750. ATI should have this posted soon. These cards will draw a MAX of 200w and is comparable in overall power draw to an 8800GTX. This PSU will run your system just fine.

Under load a single 3870x2 consumes 270-290W. Idle is around 140W. Source please??

http://www.atomicmpc.com.au/forums [...] t=9354&p=0
says 188W for one

That's 15.67A @ 12V, or 31A for 2. A corsair 750X should be more than plenty.

You'd be hard pressed to put together a system that could overload a TX-750. I'm not saying it can't be done, but it would be difficult without tri-SLI.

That being said, PSUs tend to be most efficient at ~40-60% load. A power draw of 600W would put a TX-750 at an 80% load. Corsair most likely underrates their PSUs a bit, but you may still want to consider a higher wattage model.

For what it's worth, here's the list of certified AMD power supplies for two 3870x2 and 2900xt:

http://ati.amd.com/technology/cros [...] wn2.html#1

Why don't you wait till the 4870 for a second card? The 3870x2 is great for now, but the $299 card reported at Nordic Hardware as arriving in June will be just as fast, then there will also be a 4870x2 @ $499. Hope they arrive on time.

I just installed my single 3870x2 today with an Antec Neo 650 in an Antec Nine Hundred case. I'm downloading 3DMark 06 now to start benchies. I'm using the latest catalyst drivers off ATI's site.

This fall, I'll give CrossfireX a try. If you do go with 2 3870x2's now, let us know how it benches.

Check your Anandtech link again. That 290w is for the entire system power draw. Not just the card.

Hey will a p35 mobo support crossfire x cuz i'm getting a pc with hd3870x2 and am interested in crossfiring it with the hd4870x2. If not how much more will a x38 mobo cost?

My God, Why were there not more answers like that.
The 750w Corsair will not even be pushed that hard.

Because life is not all zen. Even Zen is not all zen, in the sense of the New Age slang term meaning simplicity.

We can assume that a 750 watt PSU will run any two cards, but the caveat is that it has to be a quality PSU. certified by AMD for that purpose.

Me, I checked ATI's list, and then after confirming his PSU was on that list; I discussed the upcoming 4870 and 4870x2's that were also of interest to him. He may not have seen the Nordic Hardware article.

Besides, there are people who would answer "yes" if he'd asked about a Rosewill (bad idea), or "no" if they were convinced that what one "really" needed is a 1000 watt Antec TPQ.

Sometimes in life it's better to be a journeyman in complexity than a master in simplicity.

You definitely added some useful information, but all of the answers did not give a clear answer to a simple question. I often find it best to answer to provide a simple answer first and then provide details later to support that answer. This way those who can't understand the explanation will not miss the answer.