It’s hidden for very good reason – you can truly hose Vegas here. The tab is called “Internal” because they are supposed to be internal to Sony engineers and support. Sometimes a Sony support engineer may direct a user to make an internal change.
I am only guessing – but I suspect that this is the setpoint where Vegas will refuse to run if there is not at least the minimum RAM set here. You can’t “force” a program to use more RAM than it needs.
Steve Mann
MannMade Digital Video
http://www.mmdv.com