computers

Does anyone know how much RAM is good for a computer to run well? I am trying to decide between a MAC and a PC that I have that will be my main computer. Both seem to run about the same but they seem a little slow to me. They both have 4gb of RAM I think and I don't know if adding more will...

I have a question for you guys. If you have ever used both a PC and a MAC for working online, which one do you prefer to use for that? A friend of mine just fixed my old MAC that has been down for several months and while it was down I was using a PC that I had. I kind of got used to how things...