If you have 4 slots to put ram, that is dual channel.
2 Slots is single channel.
6 slots is triple channel.
Triple Channel > Dual Channel > Single Channel.
What is your computer specifications?
Tell me so i can tell you whether 4GB is sufficient for you, or if 8GB would be better.
Good companies for ram is Corsair, G.SKill, A-Data, Patriot, and a few others.
How much money do you plan on using for 4GB's of RAM? I will help you look for the best one for that amount.
HI, I have ASUS m4a88t mobo with AMD phenom II X6 processor.
Right now i have corsair ram 4GB. I think this onehttp://www.corsair.com/memory-by-product-family/vengeance/vengeance-4gb-single-module-ddr3-memory-kit-cmz4gx3m1a1600c9.html
But i am not satisfied with it. It is quite slow and sometimes my PC lags...:(..
It can be near about $50-60, but i need a good RAM and i was also thinking about some stable RAM after overclocking it...:)