I run a E6600 CoreDuo system with a Intel 975XBX sys bd + 4gb ram and a QuadroFx board.

This system simply fly! It's much faster ( ~ 30 / 40%) than the previosly already fast AMD X2 4400+
And is extremely faster than any P4 based system, including the D dual core version.

Vue5 infinite and 6 take full advantage of both cores when it's time to render.

You simply need XP home or Pro 32bit version.

From the preliminary benchmark I made there is NO speed difference between 32 and 64bit op.sys. with the current Vue6 release running some supplied demo scenes. Other user opinion welcomed!