What wattage PSU should I get?

[eheminger]

Hello. I am building my first computer this summer and would like to know what wattage power supply I should order for it. Here are the specs:

-Intel Core i7-2600k Sandy Bridge processor, overclocked to 4.0GHz, cooled by a Cooler Master Hyper 212 EVO cooler
-NVIDIA GTX 570 graphics card
-2 x 4GB DDR3 RAM
-64GB 2.5-inch SSD
-2TB 3.5-inch mechanical hard drive
-4x 120mm blue LED case fans
-"normal" MSI ATX motherboard, nothing too special about it

I want this computer to be really power efficient. I currently have a 550W Rosewill PSU picked out, do you think I should upgrade to a 600, or 650W PSU?


Thanks!

 

[fb39ca4]

You need a PSU with a single 12A rail of at least 30A, I would get 35 to be safe. If it is multi rail, one should be at least 20A for the GTX 570, and you should not have a problem with the other rails.