Will a q9650 bottleneck 750 Ti?

A bottleneck will only occur if the CPU is throttling at 100% usage (above 90% can count also), otherwise what's limiting the card? If the CPU usage is very high and the GPU usage is very low, this indicates a bottleneck. In the games you play currently if your CPU is coping just fine I don't see any issue.
 
Bottlenecking is guesswork. There's no formula or look up table. If you don't have problems playing your games at the moment, then the CPU is coping with the games. The gtx750ti will need the cpu to lift its performance so it can run at 100%. By how much is unknown. So we guess - based on similar bottlenecking questions.