Just built a P55A-UD3 w i5-750 and Corsair XMS3 memory with Windows7 Home Premium 64 bit and it has one of most frustrating builds I have had in years. For some reason the system when sitting in Windows7 at the desktop idling the case speaker emits a single beep seeming randomly. For the thread on my timings see http://forum.corsair.com/forums/showthread.php?p=435394#post435394 . I am not the only one having the same problem as there is a thread on the Gigabyte forums from someone with the same mb and memory and theirs is beeping http://forum.giga-byte.co.uk/index.php?topic=1150.new;topicseen#new ( I am the "frustrated" in that thread).