New MacPro much faster rendering compared to Nehalem?

I have a dual quad 2.66 from 2009 and I'm about to start a new project that's going to be heavy on the rendering. Anyone have any idea what sort of increase in speed I'll get if I invest in a new 12-core 2.96 Westmere? Anyone done this upgrade?

So Qmaster won't help.

Rendering what exactly i.e. what footage with what effects using what drives? All those things make a difference.

I wouldn't put those kind of bucks down on that machine just now. Certainly not just to run FCP at 32 Bits and 4GB of RAM. You'll get a bit quicker render times from the processors, but nowhere near enough improvement to justify the price tag.

Here's one guy's comparison:

[arstechnica.com]