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Also worth considering:
Modern PSUs can have 2 or more 12v rails and these are what are important for stuff like running two VGA cards in SLi mode.
If you try and run all your drives and fans off one branch of your wiring, you will exceed the amperage of that branch and rail.
(By branch, I mean the group of molexes on one set of wires)
Try to split them evenly.
I put both my HDDs on one branch, MY DVD on another and the fans on the last one.
The VGA got a bit arsey with my in FarCry when I had it cranked up until I put it on it's own cable branch.
Aside from the stated brand issue, the AMPERAGE is also very very important.
Certain devices suck huge amps and as such cannot share a rail or cable branch with another device. (Like my VGA card that was sharing with one of the HDDs)
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