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PSU/Electronic Guru's Please help me Understand Amps

S

spectecx

Junior Member
Hello all, Noob here, found you guys on antoher site.

I need help with understanding the Amperage ratings on Power supplies.

I have:

E6600
XFX nForce 680i LT Mobo
2 Gigs Corsair XMS 6400 C4
WD 40 gig (old as heck, 5 years) Will get new Sata later.
Wanna Run Dual SLI when 8800's Come down.

My Manufacturer Sates "To run an Ultra High-End SLI PC, I must have a PSU that can providea Mimimum of +12V @ 22A of dedicated power for the two Graphic Cards (2 X 8800). Of this 22A requirement, +12V @ 5.5A must be available to each of the two PIC Express 6-pin auxiliary power supply connectors. The remaining 11A must be supplied to the MOBO for dedicated graphics use"

My question, from the above quote is:
1. say for instance I have a PSU with 4, +12V rails, each has 18A, does this equate to {+12V @ 18A Plus +12V @ 18A Plus +12V @ 18A Plus +12V @ 18A} = 18A X 4 = 72A total, which would be more than enough for my 22A requirement?

or, 2. Same PSU will not be sufficient for my 22A requirement as there is only 18A? on a rail which is 4A les than the 22A requirement.

Thanks much
 
1 is more correct than 2, but neither are accurate. While you may have 4 rails each capable of 18a, there is still a combined total amperage, that is normaly less than adding the 4 rails together. So while each of those rails can supply 18A, the total 12v amperage allowed may be like 60A rather than 72A. A good PSU with 4 18A 12v rails will be more than enough(actualy more like an overkill).
 
Hey Stevty, thank you so much. I only used that as an illustration. I prbably wont get 4 rails. I gues my illustration works if I have 2 or 3.

What I understand is to add up the aperage and take 10% off for fudging it, right
 
Really the only way to know, is if the PSU manufacturer lists the specs, there is no set percentage you can subtract to figure out the combined rating. As long as you go with a quality brand, you should be good to go. Enermax, Seasonic, Enhance, Fortron are good, Corsair has some nice PSU's as well.
 
Ok great, I was looking at these Enermax, Seasonic, Enhance, Fortron so my choices have been confirmed, thans again, Stevty
 
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