I recently got a 'slightly used' Sapphire R9 290x 4gb video card for my i7-3820 cpu @3.60 GHz. My CPU is no slouch and this card is supposed to be a beast but when I try to run Team Fortress 2 on max settings, it lags so much that its unplayable and I have to turn quite a few settings down for it to run smoothly. I have been able to play Shadow of Mordor and Thief on ultra, and those games have much better graphics. I saw a video on youtube of a guy using my same card at 7860x1440 resolution with triple monitors, at 299 fps. He also had an I7 processor... I don't understand why my rig doesn't chew up and spit out a game like TF2. I also have 32GB of kingston high performance RAM. Can anyone help me?