Hi Airbot, welcome to the board,

I believe a standard size PSU would fit in that unit. In making sure of that, you always can take a measurement before purchase. I don't believe Gateway will provide such information.

If the possible reason for your step up is for an addition of a mediocre gaming GPU, I heard that the built in 400 Watt PSU provides sufficient amperes.

Good luck and post back.

I had a old eMachines (Gateway) computer, and it would accept any standard size PSU.

Originally Posted by YoVincenzo

I've seen some computers where the manuf had changed the location of some wires in the plug. I'd suggest comparing the wire colors on the new and old motherboard connectors before installing.

Dell is the manufacturer you are thinking about. For a number of years, they used none standard PSUs which, although they had the same physical dimensions and mountings as a standard ATX unit, were certainly not interchangeable. Although the plugs were the same, the order (as well as the number of voltage lines i.e. 3.3v, 5v and 12v) of the wires on the main 20/24 way plug was different. In addition, on some units the wire colours were not standard.

Gateway has been known to do it as well - an in particularly, some Gateway models are set up as BTX cases as opposed to ATX cases, making the restrictions on PSU, while not as great as a completely non-standard PSU, still more restrictive, in that you need the cables to be a certain length to make it to the motherboard and peripherals....

It could be a heat issue, a PSU issue, or other issues, including a mobo issue - but you might want to evaluate your PSU requirements using the eXtreme Power Supply Calculator v2.5 to be sure your 500 is going to be enough.