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Benefit of a Single-Rail PSU? - Page 4

post #31 of 32
Oh my.. why waste the money. A 750W Corsair TX for around $100 is MORE than plenty:
http://www.buy.com/prod/corsair-tx-7...206178325.html

If you REALLY want to have 1000W (for e-peen reasons only... I see no other reason), then get the 1000W version of the corsair, even though it would cost you more than twice as much:
http://www.buy.com/prod/corsair-hx10...207510101.html

Unless you're keen on wasting money... then by all means, spend more.

And you always have to do research. Note that many brands don't build their own PSUs (Silverstone, Corsair, Antec, PC Power & Cooling, OCZ... just to name a few). It's important to know who the OEM builder is, and even then there can be major differences in quality.
    
CPUMotherboardGraphicsRAM
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CPUMotherboardGraphicsRAM
E8400 @ 3.8 GHz DFI LANPARTY DK X38-T2R eVGA 8400GS 2GB Mushkin DDR2 800 (single stick) 
Hard DriveOptical DriveOSMonitor
250GB WD SATA None Windows XP Pro 32-bit HP Pavilion f1703 
KeyboardPowerCaseMouse
N/A Corsair HX520 Coolermaster Cavalier N/A 
Mouse Pad
N/A 
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post #32 of 32
Quote:
Originally Posted by Mhill2029 View Post
Multiple rails can cause issues when using Multi GPU configurations.

Basically, you can use only so much of the power from a multi rail PSU. If one rail uses a given amount of power for devices the rest of the power remaining on that rail is unavailable. With a Single Rail design all power is available and isn't wasted.

That's my best way of putting it.
Typically the rail feeding the PCIe connectors are dedicated and capable of delivering twice the current a graphics cards needs, so this isn't really an issue.

Unless you're talking about older units from when SLI first came out and the manufacturers were using an EPS12V rail layout with the PCIe connectors on the same rail as the Molex (the SilverStone ST60F and original PC Power 850 SSI).

Quote:
Originally Posted by Mhill2029 View Post
Cognoscenti had the problem herself, she constantly got system shutdowns due to overloading a given rail.
Do you recall what PSU she had and what graphics cards she was powering? Right PSU for the job and all that.

Quote:
Originally Posted by Mhill2029 View Post
Well it's not so much of an issue now, a number of PSU's quoted as having multiple rails actually use a single transformer.
Well, it's not so much that. Most PSU's have always had single +12V outputs that were split up. It's a matter of how they were split up. Over the years, the PSU manufacturers learned from others mistakes.... while other manufacturers just changed their marketing to make you believe that it was a bad idea to begin with.

And OP: You don't need anywhere near 1000W. I run a pair of 8800 Ultra's off an 800W (with four +12V rails, but that's a moot point) for goodness sake.
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