So my grandfather has said pc above and he doesn't want to buy a new one, he doesn't want to swap the case or move hdd over to something newer, he wants the same pc but he wants it faster, I told him I could put a better cpu and a better gpu aswell as a corresponding psu, but I'm not sure what would fit and what wouldn't, I would take the pc apart and just lay it out and measure everything but my grandfather is obsessed with this thing and won't let it be turned off for more than a few hours let alone a few days, so is there anything that knowingly would be compatible with it, my grandfather told me he would pay whatever so I don't need any budget things or anything just the best that fits honestly