And GTX750Ti must be cost around 130us but up is same relation between your actual card and mine
GTX 750 Non Ti around 120us for 2048MB model
GTX 750Ti around 135us for 2048MB model
Resume GTX750 Ti must be have between 2 to 2.5x performance ratio compared with Geforce GT630 GK208
However memory in GTX750 Ti is much much faster than mine vga, GT 630 GK208 have 1800mhz 64bit DDR3 (around 14.4gb/s of memory bandwidth) but GTX750Ti have 5400mhz 128bit DDR5 (around 84.3 gb/s memory bandwidth), in this case ratio is much higher GTX750 Ti offers 6 times more memory bandwidth than GT630 GK208
Respect GTX and Ti be only names provided for nvidia for discriminate normally more power editions than regular non ti, for example
This is gpu charts by gpudatabase for GTX750 (Non Ti) and GTX 750 Ti
Resuming GTX 750 (Non Ti) have 512 shaders, 32 tmus and 16 rops
And GTX 750 Ti have 640 shaders, 40 tmus and 16 rops
However both models came with 128bit DDR5 (around 80 gb/s memory bandwidth) normally