Let's start with the mainframe, 4000.
I5 3470 bulk 1050
CPU cooling, mysterious blade shooter 40
Huaqing B75 PRO 450
*2 Memory 500 Kiki or pirate ship 4G 1600.
The hard disk Seagate 1T is less than 400.
The graphics card Dylan Demon HD7870-2G, which is now around 1300, has very good poison performance.
Or Inno3D GTX660 Frost wyrm Version 1300.
Or the game 2G of microsatellite R9 270, 1400.
Suggest doing it in order
The power supply new valley GP600G black gold version is less than 300, although the brand is not so good, but the price is very high.
Or use Hangjia MVP 500,350 or so.
Choose a box you like.
Problems can be adopted. Thank you.