Enough Power?

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I am looking to buy a couple of the 4890's on this week only before it end tomorrow.

I am not sure if my PSU can handle it or not.
Corsair HX 620W Modular PSU

Running:
Gigabyte P35C-DS3R
C2D E8400
8Gb Corsair XMS2 (4x2Gb)
250Gb Seagate Barracuda
8800GTS 512
Sata DVD Drive

I'm hoping to clock the cards up a little (Heard they can do 950?) and maybe the CPU to 3.6 ish. Ofcourse I will need a new board for the 2 cards.

Can the PSU cope with the 2 cards and/or the OC as well.

 

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Thanks for the detailed reply james.miller.

Guess I'll stick with this unless I can stretch the budget to a i7 build *counts pennies*

 

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im sure corsair 620Ws having been failing recently on the forums but it probably will be fine

Have had my Corsair almost a year if not over so it isn't a recent one. Doing fine so far.