The difference is the graphics memory which is used for textures and rendering. The 1gb is more than enough and the 2 gb is a marketing trick. The 2 will perform exactly the same.
thank you so much for the information.. my usage is only photohop premiere pro and games like COD and CS GO... so 1 gb should do good right?
and last question that i wanted to ask was should i go with the IB corei53210 or for the A10-4600 cause i have that option too