i tried furmark's benchmark testing app and i only got around 32-34 fps throughout the 60 secs. Games seems to be smooth even on max settings (except the resolution is only on 1280x800 as the old monitor's max res). Is that range of fps for GTX 460 normal?
what kind of setting did you use for your benchmark? btw i believe furmark geared towards more on gpu stability test rather than a benchmark to measure gpu exact performance. try running programs like Unigine Heaven which is true benchmark for measuring gpu raw performance.