Is bits of Graphic card plays a vital role in Heavy Gaines V r playing

[Burhan Ahmed]

I mean if I buy a 2 gb graphic card which has 68 bits or 128 bits so
What will happen if I run the game
Please Tell me in detail way Friends

 

[Mousemonkey]

http://www.tomshardware.co.uk/answers/id-2281548/budget-maximum-250-buy-gaming-main-diffference-bits-128-gpu.html