I have a hp p6 2321es using an AMD A4-5300 on a FM2 Jasmine 7778 (HP's mobo). I want to upgrade the processor, at least an Intel i5. I have a 250€ budget for the processor (and the new motherboard). My PSU gives 600W and I'd like to keep the original case. What can I do with that budget? I looking for occasional gaming (Rome 2, Battlefield 4 etc..) and, over all, AutoCad 3D design.