I recently built a system with an i5-660 Cpu, an AMD Radeon 5870 1GB (ever so slightly over-clocked), 16GB DDR3 and an HP 'MSI' OEM motherboard. I've got a VS550 PSU if that helps. I have recently installed some games and have noticed that my Cpu is almost always at 100% in game but my Gpu is normally around 20%. This is a Cpu bottleneck for sure?! But bottleneck calculators say there isn't a bottleneck. As you can tell this is a budget build so I need to fix this cheaply. Does anyone have any ideas for any Cpu's I could use?