New graphic card

[Tally]

Yea, but my new graphic card is a R9 290. The graphic of GTA V is fantastic with only 3-4% laggs. But I don't understand why Ghosts has a bad graphic and laggs.

Ghosts is a notoriously bad console port. It is not optimised at all well for PC. The forums have been awash with people complaining about it. I have 2 x GTX 980s and I still can't have shadows on and extra textures. It lags too much. It is all right for single player, but not for multiplayer. So, do what I suggested - turn off shadows and run in 720p.