Wow....LOL!! No mark no sex...

Seriously though...there is a difference...seriously...i provide links if need be...

Bartons ARE Thoroughbred 'B's but with 512KB L2 cache...thats what MAKES the Barton a Barton...

ASIDE from the extra cache..no, there is no other difference, but the CPU Core itself is bigger on a barton to accomodate the extra cache....i have 3 Athlon XP's sitting right here infront of me right now man...ive owned EVERY single Athlon there is possible to own (in Stepping/core changes, not frequency wise)

Ive had a 1600+ Palomino...I HAVE a 1900+ Palomino, I HAVE a 1700+ Thoroughbred 'B', i HAD an 1800+ Thoroughbred 'A', I HAD TWO 2500+ Barton's....

Socket A:

Thunderbird 'B' = Original Socket A Athlon w/ 100Mhz FSB. 700-1400MHz
Thunderbird 'C' = Original Socket A Athlon w/ 133Mhz FSB. 1000-1400MHz
-These here above are the ones that used a ceramic CPU Packaging and u could do the good old pencil trick across the L1 bridges to unlock the multipliers from 5 - 12.5. Built on the 0.18Micron process
Palomino = Original Socket A Athlon w/ 133Mhz FSB and added SSE Instruction set and on-die thermal diode. 1500+ - 2000+
-These were the first to use the organic style cpu packaging that was either a brownish/orangish or green colour and the pencil trick no longer worked to unlock the multipliers, u had to fill the laser cuts with something like crazy glue and connect the bridges with a conductive ink. These were also the start of the Athlons using a Performance Rating system. 1500+ = 1.33GHz, 1600+ = 1.4GHz etc etc. and also built on the 0.18Micron process
Thoroughbred 'A' = A Palomino that has now been shrunk using AMD's first attempt at the 0.13Micron Process. Built as 1700+ - 2200+ Units ONLY for a limited time. It was known the 13 layer die process of the T-Bred 'A' caused instability problems above 2200Mhz, so in comes....
Thoroughbred 'B' = A T-Bred 'A' but with one extra layer in the die process, the CPU core is SLIGHTLY larger than that of the 'A' but it also runs at cooler temperatures, higher clock speeds and reduced voltages...this is the 0.13Micron process that gave the T-Bred 'B' the OC king crown until the release of the Barton. T-Bred 'B' ranged from 1700+ - 2800+, 1700+ - 2400+ all 133Mhz FSB, 2600+ - 2800+ are 166Mhz FSB....
Barton = A T-Bred 'B' but with 512Kb of L2 cache...released as a 2500+ w/ a 166Mhz FSB @ 1.83Ghz it also made a final appearance as a 3200+ model which was the first model to be released as a 200Mhz FSB chip, later a 3000+ was released on the 200Mhz FSB aswell. The 2500+ became the CPU of choice by Enthusiasts etc...were KNOWN to do 2200Mhz w/ stock HSF simply by selecting 200Mhz FSB or the "3200+" option in the bios, as both the 2500+ and 3200+ used a multiplier of 11x, just different FSB Ratings.

Anyways....here....T-Bred vs Barton

-Jay