KT266 Pro2-RU + mobile barton XP2500+M

There's been a lot on this forum about the modded bios etc which enables the 6380 v2 motherboard to be compatible with the later T'bred and thornton chips.
But searching through the maze of users' comments I've failed to locate anything saying that it is also compatible with the Barton chip, specifically the mobile Barton chips.
I currently use a 2 year old Thunderbird 1200mhz chip, and would like to upgrade to a Barton 2500+ mobile chip, as it's the only 266mhz Barton chip I can find in the UK. I assume that I cannot use a 333fsb chip on my mobile, unless it is unlocked an I can move the multiplier high enough?
I am utterly confused with the products that AMD have on offer. Is there anywhere where their performances have been compared? Is a T'bred 2500+ significanly slower than a Barton 2500+ because of the 512kb L2 cache?
Cheers

Hi all for again,
I have K7T 266Pro2 - RU (MS-6380)
What is the max speed of processor/fastest procesor, which can I safely use? - I would like stable system too - I want NOT using overclocking...
1) If I make all mods to work with Thoroughbred (update to BIOS 3.7, remove C37), it will work with Thorton?
2) What is the max configuration (speed) with K7T 266 Pro2 - RU? I read much in this forum, but I'am very foggy. Is it 133 * 15 or 133 * 17.5 (with set auto in BIOS or HOW?)
What is the max configuration without doing some special mods (e.g. on processor) only with changing settings in BIOS and with removed C37?
What is the best and fastest choice of processor?
Many thanks for any advice and very sorry for my very poor english.

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