If your choices for a PSU are limited you can use it, but a bit more power and a higher quality brand would be better. Yes, you can use it. Will it work well and be reliable? Unknown.My spec
Rx 570 itx 4gb
I5 2400 3.1ghz
Ram 4x2Gb
Fan 3
Is MWE 450w enough for my spec?
ThxxxYes, it is the minimum for what you have and should be okay.
ThxxxIf your choices for a PSU are limited you can use it, but a bit more power and a higher quality brand would be better. Yes, you can use it. Will it work well and be reliable? Unknown.