I made a post previously on here about how to upgrade my pc but got stumped on where to find my PSU, greeted by help by many wonderful people I was also busy so had no time to open my PC and find out my PSU. I've now sat down and genuinely want to upgrade my PC I bought it roughly 4 years ago its a DELL inspiron 5675, with a CPU AMD Ryzen 3 1200 Quad-Core Processor and a GPU AMD Radeon (TM) RX 560 after research online I'm pretty sure its PSU is 450 and can be upgraded to 850, although I'm not sure, i just need advice on how upgradeable it is and what I'd need to buy, never upgraded a PC before