Tom's Hardware > Forum > CPU & Components > Power Supplies, PC Cases & Case Mods > PSU Question
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jduquemin   01-22-2007 at 03:23:23 PM

Right, I'm in the process of building up an Athlon 64 SLi spec pc to replace the Athlon XP 3000 based system i'm currently running. I've had differing information from manufacturer websites and forum threads wit reference to the PSU to buy.

The specifications of my new machine are as follows:

AMD Athlon 64 3700
MSi A8N-SLI FI motherboard
2 x BFG Tech NVidia 7600GT OC GPU with 256MB RAM
4 x 512MB DDR 400 memory
2 x 250GB SATA II drives in RAID 1 array
1 x DVD/RW combi drive

I have seen 2 PSU that I am interested in but am now concerned that they won't meet the power required by the motherboard (20A on 12v rail).

I am currently deciding on either the Hiper Type R 4B580 which has 20A on 12V1 and 18A on 12V2 or the XClio X14S4P4 700W PSU that has 4 12V rails but only supplies a Max load of 18A per rail.

Slizone has recommended both these PSU for SLI systems but could someone provide me with any information about these 2 PSU and whether they would provide enough power for the motherboard I have purchased.

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jduquemin   01-23-2007 at 10:43:56 AM
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Both have ample power for your system. You want to look at total amperage on the +12v rails not the idivigual rails. The amps on each rail are the max that rail can handle before failing. It is not the max amps being supplied to that rail. To find out the max amps being supplied to the combined +12v rails you need to know the max wattage being supplied to the rails. In the case of the 580W Hiper there is 360W. You take that wattage and divide it by 12 to get the amps. So the Hiper has 30A on the + 12v rails. Read PSU 101 to find out more and how to calculate your system's power needs and find the right PSU for it.



Thanks for that information. My only problem is that the Xclio website does not state the max amps being provided to the combined +12v rails on the PSU, only the individual rails. In PSU 101, it is mentioned that the total ampage can only be calculated if this combined figure is provided. As you have already given me the combined wattage figure for the Hiper PSU, i will be buying that one as that was the first one I considered. Do you think, given the spec I have listed, that this PSU would have enough power to satisfy further upgrades in graphics cards?

As far as I know, the cards I am purchasing draw their power from the motherboard as they don't have separate connections onboard for their own power supply.

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