A few years ago one of my friends gave me an old Cyber Power pc. I would like to upgrade/build a new pc but I lack experience and knowledge. I am not sure what parts to buy and replace and I would like to sell any parts I don't need. Ideally the new build will be able to play at 1440p and maybe even 4k depending on the price. From what I can tell the pc has a MSI Z87-G41 PC Mate, an Intel I5 4570, 8 gigs of DDR3 ram, an EVGA GTX 770, and a 800 watt power supply (I don't know if it is safety certified). I know the ram and graphics card have to go but I don't know what to do with the processor and mobo. Any help is greatly appreciated.