PSU Adequate for this build

I'm building a system for a friend and I haven't really been looking at components since I built my system about 8 months ago. Not alot has changed besides prices and the quad cores being much more available.

Here it is:

Gigabyte GA-P35-DS3L ATX LGA775 P35 1333FSB 1PCI-E16 3PCI-E1 3PCI SATA2 Sound GBLAN Motherboard
Intel Core 2 Quad Q6600 Quad Core Processor 2.40GHZ 1066FSB 8MB Retail
Corsair XMS2 TWIN2X2048-8500C5 2GB 2X1GB PC8500 DDR2-1066 CL 5-5-5-15 240PIN Dual Channel Memory
EVGA E-GEFORCE 8800GT Superclocked 650MHZ 512MB DDR3 PCI-E Dual DVI-I HDTV Out DIRECTX10 Video Card
Western Digital SE16 500GB SATA2 7200RPM 16MB Cache 8.9MS NCQ Hard Drive OEM 3YR MFR Warranty
Pioneer DVR-212D Black DVD-RW 18X6X18 DVD+RW 18X8X18 DL 10X SATA 2MB OEM DVD Burner No Software
Arctic Cooling Freezer 7 Pro LGA775 2500RPM 45CFM
Thermaltake WingRS 101 Black Mid Tower ATX Case Silver Black 4X5.25 1X3.5 5X3.5INT No PS Front USB
Samsung SyncMaster 2220WM 22IN Widescreen LCD Monitor 1680X1050 1000:1 5MS VGA DVI HDCP W/ Speakers
Coolermaster Extreme Power 500W ATX 12V V2.01 Silent Power Supply 20/24PIN 120MM Fan
Cooler Master Neon Blue LED 120MM Case Fan 3PIN 22DBA 1220RPM 42.734CFM 3PINS

I'm hoping that 500W PSU is adequate for this build. But I'm not sure with the quad core and the GPU. I just haven't got a clue. I know my 600W is totally adequate for my Intel 4300 and NVidea 7900, even with my OC'ing of both. This build isn't meant to be OC'ed, I don't think.