I recently purchased a Toshiba L855D-S5114 laptop from Best Buy for $379.99 (new not refurb). The first thing I noticed was the RAM. The laptop came with a single module of Kingston 4gb 1600 11-11-12-28. I was very unimpressed with it and as I started reading and researching I found that APU's greatly benefit from Dual Channel RAM with fast timings and speed (more so than other CPU's). So I found a kit of Corsair Vengeance and ran a couple benchmarks before and after upgrading.