Nope. Only specific models of gaming laptops ($1,500+) have that capability (< 1% of all laptops sold). Additionally, these MXM format graphic cards are pretty expensive compared to desktop graphic cards for the performance you get and they are also very hard to find. Usually they will show up on eBay.
If you want better graphics, then you need to buy a laptop with something better than the Intel HD 3000. I generally recommend getting at least a nVidia GT 640 LE for 1366x768 resolution and the GTX 660m for 1920x1080 resolution.
Benchmarks for the Intel HD 3000 / HD 4000 have shown that faster RAM has very minimal affect on performance. Only when looking benchmark programs will you be able to notice the negligible increase in performance.