Ok. I really don't know much about power supplies, but do you think I will need 630W's?
you will be fine with either PSU, in total system power at gaming you won't break 300w
CPU: Intel Core i7-920 @ 3.33GHz
Motherboard: Asus Rampage II Extreme
Chipset Drivers: Intel 22.214.171.1245 (Intel)
Hard Disk: OCZ Summit (120GB)
Memory: Patriot Viper DDR3-1333 3 x 2GB (7-7-7-20)