Your getting into a lot of "what ifs" to which I don't know the answers, not for certain.
My thoughts, in no particular order.
Desktop systems interpret the voltage ids, VIDs, of mobile CPUs differently than laptops. That's why the 1.45 V mobiles POST at something like 1.6 volt by default on desktop motherboard. Not a problem on motherboards that can set Vcore manually. I don't think it's an issue with Mobile Barton which seem to do pretty well up to 1.75 volt, even 1.8 volt. You're taking big risks if you set Vcore higher than that for sustained periods (IMO).
Your motherboard has a max multiplier? That mightmax only be documented because the chipset was designed in the Palomino days, when I think 13.5x was the highest.
Adressing that by example, my previous motherboard, an Abit KT7 with a KT133 (not KT133A) chipset had a max documented multiplier of 14x. Yet I've run my mod'd Tbred up to 21X multiplier and POSTed my board up to 23X. This was with FSB of 100 Mhz.
So don't take the multiplier max as an absolute limit it depends.
Now for the gotcha's. The only reason why my mod'd XP1700+ worked on my KT7 so easily (in my opinion) is that I have a 1.6 volt version instead of the later 1.5 volt versions. This is a factor because the KT7 defaults to a 20X multiplier when any unlocked processor with a high multiplier (13X or higher) is installed and 20 x 100 is a bit of overclock stretch for an early the Tbred B at 1.6 volt nevermind 1.5 volt. Each time I cleared CMOS I had to quickly increase Vcore. I had to jump into BIOS setup quickly before the system crashed. At 1.85 volt 21X was no problem.
How does one do it when multipliers are limited to 13X? These old motherboards can't manipulate the higher multiplier bit, the 8X bit, but if the bit is forced either by mod'ing the L3 bridge on the chip or by mod'ing the socket then the CPU multiplier remaps take over.
The remaps are kind of like that of the old K6-2. Set the multiplier to 2X and 6X is interpretted internally. On Tbreds, unlocked Bartons, and on mobile Bartons there are many more multiplier remaps. For example 7X becomes 15x, 7.5x -> 22.5x, 8x -> 16x, 8.5x -> 16.5x, and more.
So even though I can't literally choose "16X" I just set 8X and I get 16X.
For motherboards that don't have adjustable multipliers. You can still mod the L3 bridges or make socket mods and force the multipliers.
Now for your motherboard with which you cannot set the multiplier. In theory default multipliers should still work. Unfortunately some boards don't POST. Some POST with oddball multipliers like the KT7 and it's 20x. Some POST with the default multiplier but at 100 Mhz FSB (common problem). And I think there are other possibilities.
Generally, if you CAN get one unlocked, high multiplier CPU to POST then you get others to work. Sometimes wiremods work better than relying on the default multiplier. If you run into the issue of being stuck at 100 Mhz FSB then you are going to want a wiremod which the only workaround or the that issue.)
After saying all that, I don't know if a 16.5X processor will POST on your motherboard. It might. You will have to try it. From what I have read people that were successful with Tbred B's on legacy mobos were also successful with Mobile XP's.
As for "Auto Detect FSB", AFAIK, that is the motherboard detecting the condition of the L12 bridges via the appropriate pins on the CPU ands setting FSB speed accordingly. (I forget the name of those pins). Multipliers are not affected Auto Detect FSB (again, AFAIK).
<b>A mind is a terrible thing</b>
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