I have a Dell M6400 Laptop. The spec is quite hefty at Q9300 Quad Code 2.53 Ghz, 8GB Ram, 1GB Nvidia FX 3700M Video. I am running Windows 7, and have recently bought 2 new games, DragonAge, and Modern Warfare 2. When on Battery Power I can run both games in full 1920x1200. The run flawlessly with full detail enabled. However, strangely when on Main Power, both games stutter, with the CPU at 100% usages on all 4 cores. At first I suspected a Driver fault so I updated all drivers; particularly Video and Sound Drivers. Someone has suggested the Video card, and that Windows automatically puts it in a low power mode when on battery. This would make sense except that when on battery, 1920x1200 runs perfectly. When on Mains even 800x600 stutters. Does anyone have any idea how I can monitor exactly what changes windows is making when I switch between mains and battery power? THanks.