Hello all, Just have a few quick questions regarding a RAM upgrade for my Dell Workstation... I'm currently running 6-monitors and multiple programs on 6 GB of RAM (1GB x 2 of DDR PC2-5300 and 2GB x 2 of DDR PC2-6400), and while my computer has generally been running pretty smooth, my Esignal has been freezing up a little bit lately. Not only that, but I am constantly getting a Windows alert at the bottom of the screen that says my computer performance is running slow (using Windows 7 Pro 64-bit). I honestly haven't noticed many issues with my performance until just the past few days, so it doesn't seem like this is a major issue but I would still like to beef up my system a bit if it makes sense. I guess my question is... does it really matter what type of RAM I use for this machine for the upgrade? All I know is that I have 4 slots (all currently filled) and that I would like more, but I'm not very tech savvy and so I'm not entirely sure what sort of compatibility issues there may be (or if certain RAM would work better than others for this particular system). Anyone have any thoughts/insights on this before I make a purchase? Thanks -- I appreciate it.