I've heard both but I'm not sure.
Last time I bought memory for my old comp.. I added it and I didn't see a speed difference and I was doing 3D rendering.
So what does adding memory do? Just be able to have more programs open at once? Then does it really help in doing stuff with just one program?
I have 3GB RAM now. Want to move up to 10GB. And I do 3D graphics rendering and stuff