QUOTE(Prodigy @ Jul 20 2005, 11:36 PM)If only one core is showing up, you need to flash your BIOS to your latest version. [right][snapback]464322[/snapback][/right]
Thanks for the reply. Double-checked and the BIOS installed is the officially supported for the x2.
Don't know how I missed it earlier but Microsoft's KB 234558 spelled it out. It seems that all that is involved is updating from the ACPI Uniprocessor to the ACPI Multiprocessor driver. Had a ghost image from today so I updated the driver, crossed my fingers and rebooted. Both cores now show up in task manager and it appears that things are working by checking the performance graphs as various apps are run.
This seemed way too simple. At this point I'm wondering if there are any system files that are out of whack now that it's running in multiprocessor mode.