GTX 260 to 560 no speed increase

I have recently upgraded my GTX260 to a GTX560 ti for use in Rift. I have not seen any increase in frame rate at all. On top of that, it seems to get bogged down more than the 260 in high population areas and boss fights. At first I thought this was a software issue. So I purchased a new hard drive and did a fresh win 7 install on it. Exact same poor frame rate.
I am running the 266.66 drivers (the latest from nvidia).

System Specs:
Mobo- Asus P5q-Pro
Proc- Core2 Duo E7200 @ 2.53 ghz
64 Bit Windows 7
4 Gb Ram
Psupply- 850watt SLI ready

Nothing is overclocked. I never tweaked any clock speeds.

Is it a bad card?
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More about speed increase
  1. I think your CPU is bottlenecking. Try overclocking to about 3.2Ghz
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