Nick I have two set's of this in my sig rig, OCZ 4GB (2x2GB) PC2-6400C5 Dual Channel Vista Gold Series DDR2 (OCZ2G8004GK) After having 8gb of ram in a decent system for a few days I can say that if I build myself a system again I am NEVER going below 8gb ever again. Honestly I am after the last day or two I am seriously starting to slip into the dangerous land of nos boost levels of hardware ownership.
Weird, I am in XP X64 at the moment and my mate just told me something weird, Try an make a folder called CON any ware on the system it wont do it. Seriously I just tried it and it just aint happening.