Really the three pieces of info we would need are, CPU (check ), PSU (Power Supply Unit), and Motherboard. Since you already know the CPU all you would need to gather is the wattage+name of your PSU and the name of your Mobo. PSU name and wattage should be on the PSU itself so popping the computer open and taking a peek to get that, the mobo should have stenciling on it with the name. If the mobo is hard to read you can always download Speccy from piriform and check that way.