Can't users who already own a Win7 beta,just simply use the update function?
I've noted that the beta version of Win 7 works fine with 768MB of ram; but too slow with 512MB of ram.
It does work with 512MB of ram, if you disable lots of services, aero, programs, etc..
As far as technet I can't seem to download the RC.
However all hail mininova which seems to host RC1.