The zotac gt 730 128 bit ddr3

[jackdoom132]

Can it fit in a asus 945 model p5gc mx

 

[clutchc]

Can it fit in a asus 945 model p5gc mx

If you're referring to the P5GC MX Motherboard, yes.
But if you want to get the most out of the GT 730, get the 64 bit DDR5 model. It is faster and uses a newer version of the GPU and faster RAM.