CPU:g640 Pentium 2.8 ghz
OS: windows7 ultimate.
I don't know which graphics card is compatible with my PC pls suggest me and i have only budget for graphic card so pls help me
It should work fine on that motherboard. If you have a low budget, and want a new card, the GT 1030 is your best choice. Just make sure you get the DDR5 version. There is a DDR4 version also for sale and you don't want that one.