Hey Digger, it's Windows 7 RC, not our MB/bios!
I'm happy to report that Windows 7 (7127 x64) is finally displaying my ram under System Properties
To my surprise, upgrading to 7127 from 7100 (instead of doing a fresh install, as I normally do) my C drive has gone down a bit by 1.5GB!
Windows 7 7100 x64 19.9GB free of 37.2GB
Windows 7 7127 x64 21.4GB free of 37.2GB