|"LOGISYS Computer PS550ABK 550Watts ATX12V Power Supply"|
"But I know the power supply isn't the problem"
You're kidding? You pay $17 for a low end POS & you know it isn't the problem? Apparently you don't know a lot about power supplies.
Look at the label. It's a 400W unit, not 550W. The +3.3v & +5v combined are rated at 200W. The other 200W goes to the +12v. So even though the +12v amperage is given as 25A, it's really only 16.67A. Looking further at what's listed at newegg:
- two 80mm cooling fans rather than one 120mm
- no PFC, not even passive
- no efficiency rating so it's probably 65%
- no PCIe plug
- amperage ratings are out of whack
- only a 1 year warranty
The power supply is NOT the place to be cutting corners. You don't necessarily have to buy an expensive unit, but you do have to know what to look for. Here's two possibilities: