It is indeed DDR2-800 (PC6400).
Here is the link to the product page:
http://www.newegg.com/Product/Produc...82E16820231087
Every so often I have crept up to 1.8 gigs used or so and I figure might as well have a bit more, it can't really hurt. But you do have a point with system stability.
Also, the last time one of my friends played World of Warcraft on my computer he pulled up the task manager and my ram was more or less maxed out. I kind of don't count this since I do not play WoW myself and have it only installed so that my friends can play/check their accounts if they are over (almost all my friends play), but one has conducted a "raid" at my house when his internet was down.
BL Revo: CF G2R, LMT1940/7, 6S FP 30C Lipos, MMM, Hitec 5955TG
CRT .5: 7075 Ext Chassis, LMT1930/7, FP 25C 3S Lipos, MM