That's really good news! Rogue, after reading that pdf you linked, this would also explain those strange time correction entries in the console when running both cores. eg.

3/18/08 8:41:32 AM mDNSResponder[17] mDNSPlatformRawTime went backwards by 4 ticks; setting correction factor to 206737245

---

 Mac OS X 10.6.4 Retail || Intel Core2 Duo E8200 2.66GHz || Gigabyte G31M-ES2L || GeForce 6600 GT 128MB || Realtek ALC883 Audio || Realtek RTL8169 LAN || Samsung SpinPoint F1 1TB HD || Sony Dual Layer IDE DVD RW DW-D22A || Apple Aluminium Keyboard || Mighty Mouse

 MacBook Pro || 2.4Ghz Core 2 Duo || 200Gb HD || 2Gb Ram || NVIDIA GeForce 8600M GT

 iPhone 4 || 16Gb