I want to buy a graphics card under 400$ and i even want to know if my pc is compatible with ddr5 graphics card i have amd fx4300 in my pc Gigabyte GA-78LMT-USB3 Motherboard and 2 x EVM DDR3 4 GB PC RAM (EVMT4G1333U86D/ EVMT4G1333U88D) . i like to play a lot of games and i am even a game...