again:
from my experience with computer parts. RAM modules must be better identical(recomended but not necessary ) if you like to use Dual-channel architecture,but is not always necessary, moreover you can turn this Dual-channel architecture off on bios, then you have no problems if you use different models totally:
http://en.wikipedia.org/wiki/Dual-channel_architecture various DDR DDR2 DDR3 cause not any OS crash or big problems..........
a simple reason for this if it was so:
then you most have for each PC around the world one special O.S only for each PC...............
i mean
1 pc=1 O.S
but it is not like that
[This message has been edited by AFG Music (edited 05-31-2010).]