I have a similar build as you and run at an average 40-50 fps on high settings. Processor: AMD Athlon II X4 630 Motherboard: Gigabyte/GA-MA78LMT-S2 RAM: 8 GB GPU: Radeon HD 4890 (1024 Mbytes) I had the same problem, when I realized I needed to set the power settings to maximum performance.for Windows 7. Go to control panel> Hardware and Sound > select High Performace. If that doesn't work, sorry man. But seeing as I'm pretty sure you have a little bit better PC than me, or almost exactly the same, there is no reason it shouldn't be running the game on high settings with at least a 40 FPS.