Just from a teeny-weeny bit of worry: Please note that my tests were done from the pure performance point of view - that is, utilizing various (synthetic) benches. But in a grand scheme of things, if you need to make a choice between 2 x GB for 1T vs 4 x 1GB for 2T, the answer can't be clear enough. You should go with 4GB / 2T instead of 2GB / 1T. The area where my tests are covering is a minuscule part of normal computing system. Compared to that, doubling the ammount of memory will out-weigh any other tiny tweaks at any given time. Especially if you're using Windows Vista. If i were given a choice at this point, I'd go with 4 x 2GB DDR2-800 / 5-5-5. Yes, 4 x 2GB for total 8GB of system memory with CL 4.