The team at Bare Feats may never win a Nobel prize for this but if you're a consumer on the market for a new computer, we suggest you check out their findings. The team put the 2.66GHz Mac Pro mano-a-mano with the 2.5GHz G5 Quad-Core Power Mac through a series of CPU intensive tests that include running:

Non-Universal Binary Apps

• PhotoShop CS2
  
• After Effects 7.0

Universal Binary Apps

• iMovie HD6
• Final Cut Pro 5
• FileMaker Pro 8.5
• Cinebench 9.5

And the results are...drumroll please...

Quad-Core G5 Power Mac beats Mac Pro Xeon/2.66GHz when running Photoshop CS2 and After Effects 7. Between the 3.0GHz Mac Pro and the Quad Core G5 Power Mac, Mac Pro is 5% slower on the Photoshop but 8% faster on the After Effects test.

Both versions of the Mac Pro are faster than the G5 Power Mac running iMovie, Final Cut Pro, FileMaker and Cinebench with the Mac Pro 2.66GHz up to 62% faster than the 2.5 GHz Quad-Core G5 Power Mac. The Mac Pro 3.0GHz was even faster by as much as 85%.

The Bottomline: If money is a big issue and the machine will be used for non-UB pro apps (like Photoshop CS2), Quad-Core G5 Power Mac is a good choice. If the machine is destined for heavy Universal Binary apps (like Final Cut Pro 5.1) and cost is not a factor, go for the new Mac Pro plus the expensive memory (the team recommend at least 4GB). However, expect a 5-week wait for the optional Radeon X1900 XT and the scarcity of correct memory from upgrade sources.