I am looking to buy some more ram and I was wondering if anyone could give me an idea of how I should go about purchasing the correct RAM for my system. I just bought this computer from my brother because he got a new laptop, and I am trying to get up up to par for gaming. Here is what I have installed now: Samsung M3 78T6553EZS-CE6 DDR2 SDRAM DDR2-667 (333 MHz) 512 MB x 2 I have attached my full system specs in a .txt document if it's needed. I really want 4GB. Is there a limit to how much memory I can install on my system? Can you tell how many pins I have because it's DDR2? I believe I have heard somewhere that you can tell the amount of pins by the speed without opening your case and counting the pins lol. Thank you in advance for your time.