upgrading dell vostro 270s GPU?

[cabbageguy]

I need a gaming GPU for my Dell Vostro 270s that can play games like GTA 5. Is the GTX970 ITX compatible with my system? Or is it too big? if it is could you suggest me a good graphics card?

 

[gwiddle]

What are the full specs of the computer?

 

[cabbageguy]

What are the full specs of the computer?

CPU: i5 3450s @ 2.80 GHz
RAM: 8gb
GPU: Intel(R) HD Graphics
64 bit, Windows 8.1