So, the 64-bit versions of Revit Architecture, Structure and MEP 2009 have been released - finally shattering the 4 GB RAM ceiling. We're currently using workstations with 8GB of RAM, but I have a 'testing' machine with 16 GB of RAM (sweet!). After installing the new Revit version, I opened the Freedom Tower model with all worksets on...yeah, I was feeling naughty. Virtual Memory usage crept up to around 7 GB when I opened up a full 3D view, then...I rendered. The VM didn't seem to change, but I didn't realize the rendering engine in 2009 runs in a separate process...ringing up another 5 GB of VM. So, if 16 GB is barely going to cut it, I decided to price out a Dell T5400 with a 3.0GHz quad core Xeon with 32 GB of RAM and a 1.5 GB video card.
$11,516 ... nice.