phil, you dont give the specs on your laptop, but my post was the result of my own testing on my system, and the results I got only 2 to 3% difference, (running 2 systems with identical parts) and I couldnt tell just by comparing them side by side, I had to use a synthetic benchmark prog to see the difference. The big difference that I could see was in opening up my games, the loading of the games and how quickly my computer booted up and also curiously enough, how quickly it exited out of the game. I play combat flight sims, and one in particular was horrible with only 1 GB of ram, Pacific Fighters. It would take over 45 seconds to initially load, would be a bit choppy while playing, especially with alot of details during a combat dogfight. Now the other thing is that when the game would quit, it took over a full minute to return to the desktop, and when it did it was very slow, one part at a time....when i put in 2 more 512MB sticks, all of that went away and the system ran terrific, but at 2T instead of 1T, and still 128bit dual channel. This is how I rate my systems, by how they perform ini real world usage, and by the way it also helped greatly with my wifes graphics and video editing she does, quicker load times and snappier performance, her rig is identical to mine except hers runs a 3000+ winnie instead of venice core( which I had several people tell me you couldnt run 4 sticks with the winnie core)....but like I said, this is my experience with this issue, others results will vary with other systems, but should still be similar...