Motherboard + graphics card compatibility!

[LalaRu]

Motherboard: Gigabyte GA-970A-D3
Processor: AMD FX 6300 3.5ghz 6-core
Graphics card: GTX 650 2gb
... upgrade my graphics card to an msi geforce gtx 1050 ti oc 4gb...

The only difference is the video memory will run at 5GHz (max for PCIe 2.0) instead of the 8 GHz you can get with a PCIe 3.0 (that memory uses the pcie base clock). In simple words, the memory bandwidth will keep capped at 80GB/s even with the card capable to reach 112GB/s.

The improvements you will get are the ones of the internal architecture (number of cores and higher base clock (1290 vs 1058MHz)).

I think you will get a 10-20% improvement on your score on same settings. Lemme know if I were correct, if you will do the upgrade

Edit: as suggested above, I think you better save your money for a new system later, than upgrading it. Your GTX 650 is already pushing the limits of your MB and any better gpu will not help you so much. For sure it doesn't double your scores, if you aiming to the 9k score for a 60fps play. Better lower some of your playing settings.