A:AnswerMost likely, just make sure you have space for an ATX psu and the motherboard has a 20 or 24 pin conector and a 4 pin CPU motherboard connector, DELL tech dpt should have a more concrete answer.
A:AnswerIf it takes the regular standard ATX power supply then yes. Almost all PCs use the ATX standered and some do use TFX etc but thats not to common, but your most likely in the clear.... I put an image to show what a regular ATX psu looks like for ya...
A:AnswerYou shouldn't try to get a aftermarket PSU for older optiplexes, The motherboard may not be compatible with the psu connecttors.
Short Answer: NO