Presuming you are running Win2000 or XP Pro... Increase of ram probably doesn't result in significant increase in performance. With Win2000, you can check how much memory your setup is using. With all your trading programs running, check Task Manager (ctl-alt-del), click Performance, and see how much total memory your system has available and how much you are using. If you're maxing out, adding more ram might help. If not, adding won't help much... it will just increase the amount of "rarely/never used" ram in your system. With 512 MB now, your "page memory" should be set at 1024. That should handle just about anything. And if you do buy memory, my experience with Crucial has also been good.