I am planning to buy a Dell XPS 15 laptop. I can configure the system for 4GB/6GB/8GB RAM. While digging for suggestions on Google I found out that Windows 7 64-bit has problems with using ALL of the installed RAM. I explored further & got to know that the real problem lies in the Memory Remapping feature of the chipset-BIOS combination. Can someone throw some light on this please. The Dell XPS 15 uses the Intel® HM67.