Just built my first computer, 4 ghz 8 core processor, MSI 970 Gaming Motherboard, 8 Gb of Ram,and a MSI Radeon R9 390 8Gb Graphics Card. Was planning on playing games like Grand Theft Auto 5 and Rainbow Six Seige, but can't play games like Counter Strike Global Offensive, which runs at about 20 fps. Using an older monitor, a SyncMaster 2033 Samsung. At a loss for what to do, as I tried installing the latest drivers multiple times. Please help!