So basically, I'm doing rig reboot. I'm adding a 1650 LP card, 16gb ddr3 1600mhz ram, and the PSU that I'm concerned about. I watched some videos about people upgrading the HP Compaq 8300 Elite. But on 1 video they left out the Cooler master 500w psu because It didn't fit. Worried that the APEVIA SFX-AP4002 Mini wont work. And on the other videos, they didn't upgrade the Power supply at all so couldn't find any that fit.