not really the cpu but the motherboard that matters. the cpu is rather weak but should not hold back a 750ti too much.
so long as your motherboard has a pcie slot (probably a 2.0 slot) then you should be ok. so we need the motherboard model or the pc model if it is a prebuilt one so we can see what slots it offers.
plus power supply is a concern as well. many 750ti models use no extra power but some of the overclocked models use an extra 6-pin or even 8-pin power connections. important ot know what your power supply can handle as well.
so please post your motherboard model as well as psu model and i can offer some better guidance on what your system can handle
....or at least the brand and model if it is a prebuilt one