huLLy wrote:
OK, my system:

AMD 6400 AM2 Processor
Asus M2N SLi Deluxe Mobo
4 Gig RAM
1 250GB Sata, 2*400GB Sata Drives
2x Nvidia 768M 8800GTX
XFi extreme gamer soundcard

My question is what size PSU will I need to run this lot when gaming?

Will a Hiper 730W do the trick??


I get a total of about 12V @ 37.1A, but it will be spread
across the rails, according to how the output is wired.
Some supplies use a single 12V output, which means not
having to figure out the distribution.

For total power I get (approximately) -

(12*37.1) + 50 + 3*5 + 1*7.5 + 10 = 528W

There is a manual for a 730W supply here.

http://www.hipergroup.com/English/do..._datasheet.pdf

Tracking where the +12V current flows, gives this. The
four PCI Express connectors, are spread one per rail.
That really isn't the best way of distributing the loading,
as the processor load on 12V2 is pretty significant, and
so 12V2 really shouldn't be used for more than the processor.

Video card = 12V_slot + 12V_EXT1 + 12V_EXT2
= 3.67A + 3.58A + 3.42A

Power supply rails, and resulting load distribution (0.5A for
fans, 3.3A for 3 hard drives and 1 optical drive)

PCI-Express 12V1 3.58 = 3.58A
ATX Main + PCI-Express 12V3 3.67 + 3.67 + 0.5 + 3.58 = 11.42A
ATX12V 2x2 + PCI-Express 12V2 12 + 3.42 = 15.42A
Drives + PCI-Express 12V4 3.3A + 3.42 = 6.72A

The Hiper supply could do the job. Or the following
Silencer 750W would also be suitable. This one uses
a single 12V rail, such that the user doesn't have to
worry about how the rail limits, like the ones above,
are policed by the supply.

Silencer 750
http://www.newegg.com/Product/Produc...82E16817341011

Paul