If I get more RAM, will my CPU be up to snuff?

[Nadamski]

So, my game isn't playable. My RAM is the biggest issue, when I get into the game, my diagnostics are already saying there is no more free RAM Space. I have 2gb, but 600mb are used just be logging onto my computer before I get into the game. I was considering putting in an additional 4gb.

However, is my CPU enough? It doesn't hit 100%, but it looks to hit about high 80's. I have an AMD Athlon 64 X2 Dual Core Processor 5000+ (2.6ghz). I'd hate to buy more RAM but find out my CPU wouldn't be able to run it.

I'm just worried about playing, not about playing at any above-minimum graphics standard. Thanks!