Thnx, for the information. Indeed, after searching more forum's, that didn't made it easier! your choice looks like the best option for me. (The price wasn't really a factor) I think I need a 850 W for my configuration CPU: Intel Core i7 -920 / Motherboard: ASUS - P6T Deluxe V2 / Mem: (3 x 2GB) - 2000MHz DDR3-2000 / Video card: Sapphire VAPOR-X HD 4870 2GB GDDR5 PCI-E / HDD: 1 TB. / Blue-ray cd/dvd writer: Pioneer BDR-203BK.