I can't find any concrete info on it either, but one thing I definitely can tell you is that it would have been insanely slow for 2008.
My guess is that it's a 500-700Mhz CPU (the fastest Slot 2 server level PIII Xeon was 1Ghz).
If my guess is correct, it's not really good for much.
Also, for what it's worth, I can't even find any info on a mobile version of a PIII Xeon even existing. Maybe I'm just not looking in the right places, but Google shows nothing as far a mobile PIII Xeon's go. Lots of mobile PIII's, but no mobile PIII Xeon's.
I have been given a HP notebook which is a 6730b, but it has a Pentium III Xeon processor.
Having done a fairly deep search on this, I can only confirm that they exist on one list with HP part number:
A "normal" 6730b had a P8x00 or P9x00 Core 2 Duo CPU and ran Vista on release.
1. what is with this strange config?
2. is there any actual advantage/disadvantage? slower, cheaper, less battery time?
3. is it possible to do a re-install of windows 7 on it?
This a 2008/9 era notebook, so why is there a late 20th century (1999) processor in it?
There seems to be no documentation from HP online about it either.
Anyone familiar with this unit?
That processor doesn't exist and wouldn't run in any new computer. There were a couple of mobile Pentium III processors used over a decade ago but nothing branded as Xeon. HP did infact make laptops with Pentium III processors that ran as fast as 1Ghz but these have been out of production for a very long time.
You will not be able to install Windows Vista or Windows 7 on a Pentium III processor, you can install Windows XP though.