In a thread I made a while ago, Grazie (a user on this board) said the following:
2] If you are running 32-bit then VEgas will only access the first 3GB of ram. If you are running a 64-bit pc AND a 64-bit version of VEgas then you can access more.
Does this apply to all versions of Vegas? And if I have 64-bit, how much RAM can Vegas access?