If the older PSU is the old model then it'll have the switch wired into the PSU, that means ,it's a big pain removing the FP Switch block and changing it.....
But if it's a standard PSU with the mains switch at the back and no other switches connected directly to it, then it fits onto any mobo and will function with the FP Power switch attached to the Mobo.
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Reply to alyoshka
I know I saw that, but, I'm talking about the one that was already inside the Dell.
Is it connected directly to the FP Power switch or is the FP Power switch connect to the Mobo?
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Reply to alyoshka