Thomas Andersson wrote:
Hi!

Any suggestions on size of a PSU for a system with a i750 cpu and a 470GTX
graphics card, say 4hds, dvd/rw, mobo and a pci soundcard? Some overclocking
expected for CPU and GFX (both air cooled).
System will never go SLI but a Pysichs card might at some point be added.

Thanks for any advice.


I5-750 95 watts. About 8.8 amps from +12V, at 90% Vcore efficiency.

GTX 470 is here.

http://www.xbitlabs.com/articles/vid...0_6.html#sect0

http://www.xbitlabs.com/images/video...470_plines.png

12V @ 17.4 amps.

Four hard drives, 12V @ 0.6A, 5V @ 1A each, gives 12V @ 2.4A.
(Many drives now, are better than that.)

Cooling fans 12V @ 0.5 amps.

One DVD, 12V @ 1.5A, 5V @ 1.5A (boiler plate max) gives 12V @ 1.5A.

Mobo and RAM is 50 watts from 3.3V and/or 5V.

Throw in another 10 watts for +5VSB powering USB stuff.

*******

Total amps 8.8+17.4+2.4+0.5+1.5= 30.6 amps

Total power - 12*30.6 + 20 + 7.5 + 50 + 10 = 454.7 watts

Compare to:

http://www.newegg.com/Product/Produc...82E16817139005

+3.3V @ 24A, +5V @ 30A, +12V @ 52A, -12V @ 0.8A, +5VSB @ 3.0A

More than enough amps to meet 12 @ 30.1 amps.

170W combined power on 3.3/5V is enough for 77.5 watts load.

Overall power rating is sufficient to handle 454.7 watt load.

Your current supply should be enough. And the TX650W has good efficiency.

http://www.corsair.com/_images/chart...efficiency.jpg

( http://www.corsair.com/products/tx/default.aspx )

As long as it has enough PCI Express power connectors, you're all set.

Paul