I take four things from this:
1. In the high end multi-threaded Apps, The Quad Core Xeons absolutely scream.
2. In consumer single threaded Apps the speed of your highest processor is more important than how many cores you have.
3. In that same single threaded environment, the latency of FB-DIMMs makes the Xeons quite a bit slower than Core 2 Duo machines running regular DDR2 DIMMs
4. Apple's Open GL/ gaming performance has come a long way towards reaching parody with windows. There is only a couple of frames difference.
For things like Lightwave, the Octo will scream compared to a single PPC cpu system like a G5 iMac. And this probably excludes Apple's 'tweaking'. And Leopard.
However, it didn't seem that much faster than a dual dual core Mac Pro at 3 gig.
With the above caveat that Apple hasn't put together a system based on this cpu, optimised it or Open GL 2 or Leopard...other factors to consider...
But a dual dual 3 gigger with a price break after an Octo gets released? Will look like a bargain. It's looking as though it will be a good couple of years until software even begins to go Multi-core mainstream and catch up.
A 3 gig Mac Pro will do for a good several years once CS 3 is released. Along with Leopard and a G80 video card..?
I may yet pass on the Octo. We'll see.
Lemon Bon Bon