i have an alienware x51 and I am going to upgrade my graphics card to a gtx 660ti, i have a 4 core i5, so what 2014 games will I be able to play with that config?
yes but the 760 isn't compatible with the x51, it doesn't have enough power supply.
The X51 was sold with a GTX 670 and used the same 330w PSU and people have even used a GTX 680 inside a X51 without adding a new PSU. I would not recommend using a GTX 680.
Sources: http://alienware-x51.wikia.com/wiki/Alienware_x51_Wiki
Maximum power the GTX 680 uses is 195w, GTX 670 170w, GTX 760 170w, GTX 660 ti 150w, Sources:
yes but the 760 isn't compatible with the x51, it doesn't have enough power supply.
The X51 was sold with a GTX 670 and used the same 330w PSU and people have even used a GTX 680 inside a X51 without adding a new PSU. I would not recommend using a GTX 680.
Sources: http://alienware-x51.wikia.com/wiki/Alienware_x51_Wiki
Maximum power the GTX 680 uses is 195w, GTX 670 170w, GTX 760 170w, GTX 660 ti 150w, Sources: