check your com.apple.boot.plist in Library/Preferences/SystemConfiguration and let me know if any boot flags (kernel flags) are set.

Have you run <a href="http://www.xbench.com/">Xbench</a> yet? Is the speed noticeable?

I am not sure why it isn't recognizing it. I know the Mac Pro can have 8 cores (two quad cores) but they are Intel Xeon. I'm just guessing that they are all working just fine but not showing. OS X doesn't always look at your BIOS to tell it what it has available... if at all.

try booting with <b>cpus=8</b> ;-) just for a laugh.

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