GTX 550 TI Performing Badly

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?

System: HP Pavillion Elite e9200
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  1. Best answer
    Did you uninstall all old amd drivers before fitting new card, old drivers can cause this problem.
    Use driver sweeper to remove all amd drivers then install clean nvidia drivers.
  2. That worked, thanks!
  3. Best answer selected by archon61.
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