I recently upgraded my system with a MSI GeForce GTX 550 TI Cyclone II from a Radeon HD 4650, along with a 500W CoolerMaster PSU. But all my framerates have dropped after installing the GTX 550 TI and I cannot even run the original Guild Wars on maxed settings in 1920x1080. Whereas with the Radeon I could do so with no problems. I found the same thing with League of Legends, Skyrim, and GTA 4. Is something from my system bottlenecking the GPU?