16 GB RAM - 15.7 GB usable 4GB RAM 2.7 GB usable ???
I uppped the memory of an ASUS Motherboard to 16 GB - no extra video card or whatever from 4GB --running W7 X-64 Enterprise version (approx equiv to W7 Ultimate). 4GB memory chips are CHEEEEEEEAP currently so why not upgrade !!.
I now get in the properties Usable memory 15.7GB (installed memory 16 GB). Fine by me.
When I had 4 GB installed the memory status showed 4GB of which 2.7GB was usable.
Why the difference in usable memory -- the BIOS or internal video hasn't changed.