So I recently purchased a AMD R9 380 to give my old Inspiron 620 a boost, only to find that it's completely incompatible. I'm not very techy, but I believe it's something to do with my PC being incompatible with UEFI cards? Excuse me if I'm talking out my arse here, I only know what I've picked up from googling my issue. Anyway, if this card is incompatible, what card should I be going for? I need a substantial upgrade to my current GTX 460, so am I best just getting a whole new PC from scratch at this point?