After reading your post again i'm not sure what you are saying. You want to sell your PG278Q and VG248 to buy a predator x34? The predator x34 is not 4k, its 3440x1440 or ultra wide 1440p if you will. I have heard ultra wide monitors provide a very good gaming experience, if you have the money the predator x34 is a very nice monitor. Your system should be able to push it just fine.