Low FPS on new, beefy Mac Pro, help!
Now, this is a beefy machine, 2 quad core 3 GHz CPUs, 8G RAM, and less than two weeks old, and I'm seeing really really low performance, graphically. In WoW, based on http://www.barefeats.com/octopro2.html, as well as consultation with a friend who has a similar system (x1900, 2.6GHz CPUs, ?G RAM), I would expect north of 100 FPS in WoW with the settings pegged, but I'm seeing more like 25-30, even at low settings (FSGE off, low resolution, 1x multisampling, for those who know the game). What's sad is that my MacBook Pro laptop, driving the _same monitor_ on an 8600 GT graphics card, can outperform the Mac Pro. So I assume I'm doing something wrong.
Anybody know what might be causing poor performance here? It's a brand new x1900, and I'm not seeing graphical artifacts, just low performance, so I assume it's not a cooling issue. Could it matter that I still have the empty 7300s hooked up, or that the x1900 isn't in slot 1? Any other thoughts about what might be wrong? I'm desperate, so any help appreciated.
Mac Pro, Mac OS X (10.5.1)