download and install this
http://www.tweakers.fr/memset.htmlmay ask for a reboot.. dont remember.. if so, do as it commands
once ready, fire it up and post the readout
if my guess is right and the moon and the stars line up with the numbers.. your just entering the FSX zone which is the best you are going to do on DDR2 and the Q6600 with the memory you are running
with that Q9650 you are actually 'in' the FSX zone
it may be possible to squeak just a tad more out of the system as is but I need to see the memset readout and the benchmark
its way late here so if I dont pst back its because I had to hang it up for the night but will be back tomorrow morning to check in