PSU Question

[robtom]

Hi everyone, I recently ordered parts to build my first desktop (listed below). In order to figure out what type of psu I needed, I used the antec power supply calculator, which gave me around 260 w. I decided with a 380 w psu just to give me plenty of breathing room. However, after looking at my gpu specs, it says I need 450 w psu. I am really confused at this point since I am sure I put everything into the antec psu calculator. Did I just screw up or am I not understanding something?

XFX HD-577X-ZNFC Radeon HD 5770 1GB

A-DATA Gaming Series 4GB (2 x 2GB) 240-Pin DDR3

COOLER MASTER ELITE 335 RC-335

GIGABYTE GA-MA785GMT-UD2H

ASUS DRW-24B1ST/BLK/B/AS Black SATA 24X DVD Burner

Western Digital Caviar Blue WD5000AAKS 500GB 7200 RPM SATA

Antec EarthWatts Green EA-380D Green 380W

AMD Phenom II X2 550 Callisto Black Edition 3.1GHz

 

[daisymtc]

Not all PSU will have high efficiency. Some older model may only have 70%. Which means 450W = output of ~ 300W. Also, we won't like the PSU always running at 100%load. Plus ppl like to leave room for overclock. So the gpu spec probably recommend 450W PSU in general.

 

[robtom]

So will my psu be capable of powering my system? Also, if I overclock my CPU would I have to upgrade my psu?

 

[jarlmaster47]

If I were you I would get a bigger psu like a corsair 650w. Its upgrade proofish and gives you more headroom to work with

 

[Pikachuwee]

Your rig appears to be aimed for gaming.

The PSU for gaming builds should be at least of 600W imo.

 

[jarlmaster47]

yea at least 600w

 

[Gooberman]

400-500 Corsair should be able to power that it's not all about the Watts !