I recently got a XFX 650w modular PSU and I have a sapphire 5870, I also have a XFX 5870 on the way. I was wondering if my psu could handle 2 5870's and can I crossfire sapphire and xfx? I think cf 5870's calls for 55a on the 12v and my xfx 650 only has 52a but 624w. I am also running a phenom ii x4 965, which is high power as well. And 8gb(4x2gb) crucial ballistix ddr3 pc3 12800 1600mhz ram. My hd is samsung spinpoit 500gb 7200 rpm sata 2. Under xp 64 bit. Plus 1 old samsung dvd burner, IDE. Motherboard is ta790gx a+3 5.x. This PSU comes with 2 pci e 6 pins built in and 2 more modular, so theres plenty of plugs. Will it work or is it too much power for the 12v rail. Thanks for the info!
Here's a quote from a post I made just about one year ago:
" I read a technical review of the 5870 over at anandtech.com. They measured the total power draw at the wall outlet (mains). That's the total power used by the entire pc. The test system consisted of an Intel Core i7 920 2.6 Ghz overclocked to 3.33 Ghz and just one 5870 and another test with two 5870's in Crossfire mode. They did the test while playing World of Warcarft. The total power draw for the entire system with one card was 295 watts. The total power draw for two cards in Crossfire mode was 430 watts. I knew the new cards were going to be energy efficient. I'm beginning to think the Corsair VX550 could power a moderately overclocked cpu and two 5870's. It's not that far from the ATI recommendation of 600 watts and 40 amps on the 12 volt rail(s) for Crossfire."
There is no problem at all. The XFX XXX Edition can handle two 5870 in CF for sure. It's a high quality PSU made by Seasonic that will provide all the connectors you need. Two 5870 in CF consume 400W at full load, so you have room enough.