Will a gtx 950 2gb be able to run games at a 2k resolution (2560x1080)?



You don't care about the fps? but you want the games to run smoothly?

The games need decent fps to run smoothly.

Depending what game you run, it may struggle
 
Performance impact is different from game to game. Expect something around 20% lower fps compared to 1920x1080 resolution.

Not all games support ultrawide resolution. In that case you will play them in full hd and black bars left and right.

So with gtx 950 you will get playable fps, just dont expect very high settings.
 


In current generation games I think yes, it will.