7870 Crossfire Power Requirement

[the1corrupted]

Hey, everyone. Don't yell at me but I have a very cheap/oem 700W power supply from Apevia (http://www.newegg.com/Product/Product.aspx?Item=N82E16817148046R), and I was wondering with the power draw of the 7870 graphics card, would this strain the power supply?

Power: +3.3V@38A, +5V@40A, +12V1@23A, +12V2@26A, -5V@0.3A, -12V@0.8A, +5VSB@2.0A

Also, this specific power supply has a total of four PCIe connections, but they're on a string like SATA connectors (two connectors per line).

Total system: Sabertooth Z77, Intel Core i5 3570K @ 3.8 Ghz, three hard drives, five case fans

7870 I am currently using: ASUS HD7870-DC2-2GD5-V2 @ 1100Mhz / 1250 Mhz

I already have one of these beastly cards, and I'd love another, but I'm fearing that my power supply is too cheap/crappy/inexpensive.

 

[DjDafiDak]

I wouldnt trust a non brand company like Apevia for anything, espaclly if its for 2 Gpu's.
get a name brand PSU,like antec.

 

[wilgoz]

Your psu will do fine... but i will go buy another psu if i were you.
Using a non branded psu creeps me out not to mention its not certified and ominously cheap

 

[wanderer11]

So that isn't really a 700W psu. Adding the current on the 12V rails we get a total of 49A. Multiply that by 12V and we get a maximum power of 588W on the 12V. Since this is split up into two rails I can't say for sure how much is available for the pcie connectors. I really wouldn't recommend crossfire on a sub 600W psu. Get a decent unit with 4 pcie connectors, you probably won't find one under 700W but it will be a single 12V rail and will deliver its rater power on that rail. For example, my pcp&c 750W mkii is rated for ~62A on the 12V giving a total power of ~744W. That's how you know it's a good unit.