How many watts do i need?

[HannahLewis]

hey guys I am planning a build next week and it contains the following parts:

 

I5 3570K         or     I5 4670K

standard z77 or z87 board from gigabyte (from around 100-150 euro)

XFX 7870 

Samsung 840 ssd 120 GB

WD black 1TB

CM hyper212 EVO

 

My question is can i get away with like a 450-500 WATT psu or do i need to look for a 600+ PSU?

 

thanks!

[iSuzak]

500/550w will be more than enough. But keep in mind that it will be enough only if you're going for a single gpu setup, so if you're planning to crossfire later, you will have to change your psu

[redhalo626]

500 watt should be enough 

[Hyydrah]

500/550w will be more than enough. But keep in mind that it will be enough only if you're going for a single gpu setup, so if you're planning to crossfire later, you will have to change your psu

+1. A two GPU configuration would only need about a 650-750W PSU.

[mvitkun]

a quality 450-500 watt should be able to handle it fine.

 

though if you plan to crossfire go for a 650-750 watt unit.

[target39]

If you ever need to calculate how many watts a rig will use, use a psu calculator. It will become useful once you start to OC.

http://www.extreme.outervision.com/psucalculatorlite.jsp

[orangecat]

Personally I would recommend a 750Watt psu. i know its a bit overkill but it would be operating in peak efficiency and its gives you headroom. Why but a just powerful enough psu then have to upgrade it later on.