Sorry if these are old topics but here goes: 1) I have 4 GB RAM and if I don't restart for a while, the free RAM gets less and less over a few hours even after quitting all programs. From about 3 GB free to 1 GB free, even though all programs have been officially "quitted". Is this just typical of Mac caching its RAM? Is there a benefit to periodically restarting for this reason alone? Or leave it and let the Mac figure out its RAM / cache situation on its own? Is this normal? 2) Fan speeds using istat are basically fixed - they never seem to change even though temps rise significantly. Is this normal? CPU and Hard Drive fan at approx 1199 speed and optical drive at 699, all the time! Temps I don't think are astronomical compared to what I have seen on this board, but hard drive gets into the 50's Celsius, and Power Supply in the 70's (C). Shouldn't the fan speeds increase as temps go up? Or only at what Apple calls extreme temps? Is this normal? It's quiet, but I don't care if it's quiet if it doesn't work! Thanks for the input -- new 24" iMac, 2.8, 4 GB RAM (factory, don't worry, only $180 with educ discount). Love it otherwise so far.