Could i upgrade to a GeForce GTX 750 Ti?

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You could switch to a GTX 750 Ti if you wanted to. But the GTX 750 Ti averages 3-5 fps lower than a GTX 660. It wouldn't be worthwhile unless you have goals aside from performance.

For example, I recently switched from a GTX 660 to a GTX 750 Ti because I was rebuilding my PC into a small form factor, and the 750 Ti allowed me to cut power consumption, and keep the drive bays in my case since it's shorter.

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The GTX 660 requires more power and is larger than the GTX 750 Ti; hence if the OP is capable of running a GTX 660, running a GTX 750 Ti would be no issue.

OP: As mentioned by others however, the GTX 750 Ti would be a downgrade. The GTX 660 is still a solid card and most would advise you wait for Nvidia's next series of GPUs; otherwise you could SLI or purchase a GTX 680/770, 780 or switch to AMD's R9 290 to notice a difference. Personally I'd stick with your current GPU unless you require more graphical "power."

All the best. :)
 
You could switch to a GTX 750 Ti if you wanted to. But the GTX 750 Ti averages 3-5 fps lower than a GTX 660. It wouldn't be worthwhile unless you have goals aside from performance.

For example, I recently switched from a GTX 660 to a GTX 750 Ti because I was rebuilding my PC into a small form factor, and the 750 Ti allowed me to cut power consumption, and keep the drive bays in my case since it's shorter.
 
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