Well, if this is your CPU ( http://processorfinder.intel.com/details.aspx?sSpec=SLA... ), it's TDP is 65W, so overclocking it, so say about 100W for that. The TDP of the 5870 is ~190W, but 400 isn't too far away. 10Ws for fans, harddrives and the Corsair H50. So unless you have 10 harddrives, I will say 100W for everything.
100W + 400W + 100W = 600W And that Antec PSU can definitely provide 600W reliably.
Wouldn't it be better to balance your build a bit?
An E5200 with 2x5870/5970? I mean, you are pairing a low end-cpu with high-end GFX cards. You're gonna have some serious bottlenecking there. Why not just get one 5870 and spend some of that cash on a quad core?
Thank you cobot! I was saying, WTF? $1000+ for two video cards? A water cooling loop? And all powered by a 5200? A dual core chip with 2MBs L2 cache? I'm almost tempted to be an @ss and ask if he's still using his 17" CRT monitor. (THAT would be funny. two 58i70s in CF so that he can play games on his 17" monitor at 1024x768....) If you can find a 5970 for $700, use the saved $300 for a new quad core CPU. I'd also seriously consider buying only one 5870 and a quad as well.
Note the 5970's clock (725-735) is way lower than your original selection's 875 .... an air cooled 5870 is usually 850 ....before you OC it
The 5970 requires a 650 watter....if ya think ya might want to XFire it, an 850 would be in order:
For comparison purposes , the list of 850 watters below contains performance ratings (10 scale) at jonnyguru.com / prices as per newegg on 02/21/2010 and ones w/ double asterisks (**) made it onto silentpcreview.com's Editor's Choice List meaning they excelled at both electronic and acoustic performance:
Antec SG-850 - 10.0 ($220) **
Antec CP-850 - 10.0 ($110) ** (only fits in Antec 1200, P183, P193 and DF series cases)
XFX 850W Black Edition 10.0 ($185)
Corsair HX850 850W - 10.0 ($180)