Thanks Rutra, yes I did go a bit off topic there.... shaving 1 or two seconds off each frame is definatly not worth it in my opinion... a minute or two then I would be very keen! 

I have an i7 920 so a fairy good cpu. When I use 5.5 gig + then things start to get sluggish. Vue can crash if I press the mouse button when it is thinbking/calculating.  Render time does not seem affected at all.  If 6 gig of Ram will stop that sluggishness/crashes  it may be a worthy upgrade I think. Just out of curiousity .. I take it you are using DDR2 Ram ? If so what make/speed are you using?