When working with a lot of softsynths the cpu level often is close to 100%, this is where my machine starts to make glitch on its own
Since ram is pretty cheap I think I might put 2 gb in my pc, right now 1,5 gb, would this have any effect on the cpu usage, and the amount of softsynths an plugs I can run
before buying, you should check if RAM is really the problem.
first of all, check the task manager to see if RAM is fully used when you are running into problems with your song. I doubt so, but in case it is, then buying some more would surely help.
RAM is more important when you are using softsamplers, while for softsynths is much more important to have a fast CPU, though fast RAM is also important.
order of importance for softsynths (most important first):