I've recently put together my first system (so obviously i'm no expert) but already I am noticing a particular problem. I've built the machine primarily for gaming using Intel Core i5-3570 CPU, and I also have an N-Vidia GTX 650 2GB graphics card, and 8GB ram. The problem is that when I've tried playing WoW, and Assassin's Creed 3, the CPU says its operating at 99% capacity and the game play is really poor visually and the lag i experience is unreal. Any ideas what the problem could be?
When you know the CPU is running at high percentage, right click on the Taskbar and open Task Manger. In the processes TAB click at the bottom to Show all Processes. Have a look and see what process is being used on your CPU.