Can certainly understand the motivation. Definitely considered a barebone machine for quite some time; however, due to the component availability and aforementioned issues, opted instead for a machine a bit more direct from an ODM.
In reference to the Z9 (Z9000), appears the Asus site does not explicitly support Dothan based processors, nor does the BIOS section seem to offer a newer release to support this added functionality. However, do see a number of vendors offer the Z9000 with a Dothan based processor, so it may be the case that either the
specifications on the site are simply outdated, or a newer BIOS exists, and simply is not publically displayed.
Curious - have you considered the
M6N (M6000N) as well?
There are a few alternate choices to Dell and what seem to be the larger companies offering mobile machines. Below are just a few suggestions pieced together from other threads. Nearly all these machines offer a bit more in the way of power and choices of display (higher resolutions):
Just hopefully presenting a few of the many alternate (but at times, lesser known) options that exist in today's market. There are many more options out there; simply borrowed this particular list from another recent thread. Again, nearly all the machines above are a bit more powerful than the original barebone machine listed at approximately the same price point.
Good luck with your decision and purchase.