power supply compatibility

[Zuhair Ishraque]

So i was looking at some 300w+ power supplies because i am planning on buying a GTX 1050 and i was wondering if there was a way to know if a power supply was compatible with a computer if it didnt specifically say so. I'm thinking about buying this one for my Dell OptiPlex 790 MT: http://www.ebay.com/itm/EVGA-400-N1-100-N1-0400-L1-400W-Power-Supply/301380760828?_trksid=p2045573.c100033.m2042&_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D41451%26meid%3D1f039184a9b3455295ec47d5598fbe79%26pid%3D100033%26rk%3D1%26rkt%3D8%26sd%3D301380760828

 

I wanted to ask if their was any way to know if the power supply is compatible with my computer besides looking at the connectors.

[Mira Yurizaki]

Assuming the power supply in the Dell is colored correctly, if they match up with the 2.0 version, you're golden:

[iamthecpu]

It does not matter what power supply you get as long as it is both compatible with the case and has the correct amount of connections for the computer. The GTX 1050 does not require any power from the power supply as it come from the motherboard.    

[alexhelvetica]

EVGA N400 is awful, don't. The PSU in the Dell will already be good, but the wattage may be the problem. How much power can it output? Can you send a picture of the diagram that is shows of the current output on the rails?