Hi, I am thinking of upgrading my RAM from 4gb to 6gb.
I have GSkill 4(2x2)gb DDR3 1600:http://www.newegg.com/Product/Product.aspx?Item=N82E168...
I can't find another 2gb stick with these specs to add to my mobo so is there anything else I can do or do I have to spring 2 more sticks or ram?
Either stick with your 4gb or get two more sticks of RAM as you will want to retain the use of dual channel. You will lose dual channel capabilities if you add a single 2gb stick. I would advise not upgrading to more RAM unless you're running RAM hungry programs. Photohop, running VM's, etc. would fall in this category. For pure gaming or general use anything more than 4gb won't be needed.