Unlocking Barton 2800+ on AN7

Greets everyone.

I know that is now not the main subject for OCing, but I own a XP locked 2800+ Barton Core (03 week 2004).

Altough I've given up on running it with 200Mhz for a long time, as the multiplier is locked at 12.5x, I wanted to give it a go at unlocking it (i.e.: Turning it to XP-M), mostly after seeing Tom's article.
My objective would be going from 12.5x166 (2083Mhz) to 10.5x200Mhz (2100Mhz), as a starting point, as my objective when I bought it was to run a DDR400 synch-system.

Now I've read countless articles and one thing bothers me is that Tom's articles "instructs" the readers to unlock the 3rd and 4th L5 bridge points, and to achive this you only would (theorticaly) the 3rd bridge, as the 4th is for MP.

Anyway, I've made equally countless attemps at this, but all have been unsucessful (always connecing L5-3 and L5-4)

The closest thing I got was (according to the BIOS and Windows):
Windows: Unspecified Processor type
CPUZ,Crystal,CPUMSR: Athlon XP-M, with the same "Unspecified Processor type" specfication (instead of the expected mobile AMD XP-M)

Of course this could have been that altought CpuZ saw a Athlon XP-M, it still was at 12,5x166=2083Mhz which no such XP-M exists... but I was expecting for BIOS to detect it correctly (XP-M).

As I said, all the attempts to change the multiplier failed, either by Software or Hardware.

Dwelving deeper I see that a normal XP-M have registers C0010042 and C0010041 enabled, but according to the register output of CPUZ and the other ones only C0010042 was enabled not C0010041, so this could be the problem.

Aditionally in CPUMSR it shows the XP2800+ as locked Multiplier, but when only C0010042 register was enabled it showed it as unlocked... the system did crash everytime I changed it nonetheless.

So to play it safe I undone everything and all is back to normal (XP2800+ Barton detected by everything).

Now my doubt is, can the MoBo/chipset be at fault here?
The board is a Abit AN7 (nForce2 400), for which the chipset is known to have problems doing software Multiplier/FSB changes.
Worser still, the AN7 specifically, has the crappy uGuru system-that-doesn't-work and is not quite standard.

My question is.
Has anyone been able to unlock a Barton core processor (multiplier locked) on this SPECIFIC motherboard?

I'm also interested in hearing other peoples attempts at this, dispite motherboard, only the chipset is what I'm concerned more.

Thanx



-- I did use to have a Signature line, but it was to lame, so I removed it and replaced by this crap --