I am just curious if any one has really seen a difference running 2 gigs of any ddr2 ram memory to 4 gigs of ram in dual channel.I hear some do not see a difference on many forums,Any one go from 2 to 4 gigs.What did it speed up.Games /programs opening ?,I have played with a comp that had 4 gigs of the same brand ram pc 5300 667mhz like i have,But i run 2 sticks of one gig and did not see any difference playing with the computer.