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.

4gb DDR2 BallistiX PC8500

CPU: E8400

Mobo: Asus Maximus Formula, X38

Corsair Powersupply 750W

Western Digital Raptor 150GB

Seagate Barracuda 500GB

Sapphire Radeon HD 3870X2

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

http://www.corsair.com/products/tx.aspx

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

Well the E8400 will save some power as it uses very little. I would almost suggest an upgrade to 850w just to be on the safe side but it might work.

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.

I found that information here: http://www.anandtech.com/video/sho [...] =3209&p=12

This site claims similar idle wattage, but reasonably higher consumption under load: http://arstechnica.com/reviews/har [...] view.ars/4

*edit* More:
http://www.tweaktown.com/reviews/1 [...] index.html
http://www.extremetech.com/article [...] 578,00.asp

There was another place with similar results, but I don't appear to have it bookmarked. If it's incorrect you may want to have them correct it for you.

*edit* That's great if it runs of the 750W Corsair. Just voicing concerns based on the information I've gathered.

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.

My post right above yours. Four separate reviews.

If you want another source, here's 5: http://www.tomshardware.com/2008/0 [...] age17.html

That's straight from this site as well. Maybe they are all wrong, but based on the information I've seen / gathered one could see why I posted my comments above.

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.

If it's anything like the Silencer 750W Quad - It should have a peak output of around 850W. Even if the 3870x2 does only use 200W under load, that would be 400W + Proc, HDD, Fans, SC, etc. That would probably put him right in that 600-700W range (esp. if overclocked) and begin to put the load into the 80% mark as you mentioned.

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.

290w is almost impossible to deliver safely to a video card. Consider that the slot gives a MAX of 75w, a 6 pin cable a MAX of 75w, and an 8 pin connector can supply a MAX of 150w. Trust me, those cards are nowhere close to 290w.

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

So under max load a total combined power amount of 300w(75+75+150=300) wouldn't be enough to give the card 290w? Its possible.

I don't doubt it can get that high in power usage. 2 chips on one PCB. Now imagine the ones that will come stock OC'ed/ Probably use more power. I wounder how OverDrive will work with that 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?

The simple answer: YES

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