PSU for Two 4870x2s

[Nohealzforu]

I'm curious if my PSU would run two 4870x2 in crossfire. Currently I'm using a 750W corsair PSU. http://www.newegg.com/Product/Product.aspx?Item=N82E16817139006

The majority of what I have read says I will probably need an 850w psu or up. I just figured I'd ask the experts here first. The chances of me getting another one are limited by if I need to upgrade my PSU.

System specs: Q9550 stock, wdvr150gb, maxtor 300gb, asus rampage formula mobo, diamond 4870x2 GPU, 8gb patriot ram 1066mhz, 2x cd/dvd drives, corsair 750w psu.

Thanks in advance, as always, for the help!

 

[vouslavous]

Personally i think your gonna need about 900w, that should do you fine.

 

[zenmaster]

I would say it would be tight.
Your PSU is good and can handle a nearly full load, but I would feel better with more power.

850w should do it, but you may be better off just waiting until ATI ships a new card more powerful than the 4870x2, then selling your current card and upgrading to the next card coming out.

 

[einstein4pres]

http://www.tomshardware.com/reviews/radeon-hd-4870-x2,2073-32.html
775 W under load

I looked around for details about how the Corsair HX750 handled current over 100% of it's rated spec., but I didn't notice anything information.

Recall that the PSU should handle 750W continuous, and the machine used above probably outdraws your machine unless you have a lot running. It's certainly going to be tight; Corsair sells good units, though. Of course, given the pricetag on a 4870X2, it's probably worth spending the extra on a beefier PSU if you choose to buy a second one.

On a side note, is performance lacking? Do you need the additional performance?

 

[w153r]

Maybe he's a Crysis fan, only reason I see for 2 4870x2's... either that or he's gaming at 2560 x 2048!

 

[Merman]

I haven't seen any max power usage specs for this card but for what its worth ATI recommends:

(1K Watt with two 2x3-pin and two 2x4-pin connectors for ATI CrossFireX™ technology in dual mode)1

http://ati.amd.com/products/Radeonhd4800/requirements.html

Then they certify the Corsair TX750W for the 4870x2 in a CrossFireX platform. 2 cards.

http://game.amd.com/us-en/crossfirex_components.aspx?p=3#ATI%20Radeon™%20HD%204870%20X2

 

[cyber_jockey]

Damn 4.8 teraflops. Whats wrong with a single 4870x2 ?