Double check that Laptop Ram is running in dual channel mode. My laptop (i5-2410M) came with one 4 Gig Ram module and was runninging in single channel mode, WIE <6 (forgot exact score, but low). Added a 2nd stick, mode changed to dual channel and score shot up. More ram also contributes, but do not know the increase of going from 4 -> 16 Gigs.
Yhis is not likely as you have 2 modules, But woth a double check.