CPU : Intel core i7 920 @ 2.67Ghz
Motherboard : Pegatron IPMTB-GS Intel X58 chipset
GFX : Ati radeon HD 4850
Memory : 3GB DDR3 RAM
PSU : not sure, as I am using an ati radeon 4850 card it should be atleast 450 Watt or greater power supply. So my bet is 500 Watts.
don't go by watts go by amps. How many amps do you need to run what's in your machine and will also work with your future upgrades.....what PS do you have ?........ what is your monitors native resolution and what games do you play ? This will dictate what card to buy.