Ok, so I have made a series of stupid and not very carefully planned decisions that have led to this. I bought an sapphire nitro+ rx 580, not realizing how stupidly large the card is. My plan was to pair it with something like a i5 3570/i7 3770, basicly an 1155 socket cpu. I found a very good deal, an i5 3470 with mobo, cooler and 8gb 1600mhz ram for 50€. I got it from a friend upgrading to a newer combo. But me being an idiot didn't realise that he bought that pc prebuilt and it was one of those workstations with a new case and graphics card. So i cannot buy that because i cannot use the rx 580 in it. I looked around the local used parts market and realised all of those combos were either from workstations, or STUPIDLY expensive. My budget wont allow for anything newer than that, so only thing left is something older. So after an unnecessary ramble and explanation, my question. How stupid is it to use the rx 580 with an old 775 motherboard and something like a q9550 or q9650? And would these older boards even fit the graphics card? Would the lack of a pcie 3.0 be a problem? I would hope to overclock the processor.