I just got a wild idea! I dont know if this has been said before or if anyone cares lol but I think why not many people are receiving good 512 MB that are AA4t is that the chips are being used by OCZ! and this is why OCZ doesnt use 2x256 mb chips! and these Vx capable chips are being buried in cheap ram and rated 2.5...after all VX is rated 2.5 untill its given 3V and up right... just my 2 cents