question on my rig

i searched first, and couldn't yield any helpful results. anyway, i'm not really a computer buff by any means, but i am an avid gamer, and i do like my games to run smooth. ok so my current rig is this:

pentium d 3.0 ghz processor water cooled
2 gigs ram
asus p5n32 sli delux nforce 4 mobo
2 7800gt's running in sli
650 watt psu

i just puchased last night 2 evga 8800gt's.

now, my question is this: will my current power supply (and i guess the rest of the setup, too) be able to handle the two 8800 gt's? and if not, what do you all recommend?? i really appreciate the help. thank you!

-jason