Athlon XP (Barton):
Flagship chip was XP 2500+ (1.83GHz). As the TBred B (manufactured in 0.13µ), but now available with 512KB of L2 cache. With a 333mhz (166 FSB) bus available at 2500+ (1.833GHz), 2800+, 3000+ (2.17GHz) and finally the 3200+ and 3400+ with 400mhz bus (200 FSB).
Athlon XP (Thorton):
Visually the same as the Barton, with 333mhz bus but 256KB of L2 cache.
Athlon XP (Thoroughbred A):
Launched with the XP 2200+ (1.8GHz). As the Palomino, but with the difference that it was originally made with a 0.18µ. core, and then changed to 0.13µ. process, which makes it possible to work with less core voltage (1.5 to 1.65v, against 1.7 to 1.75v from Palominos), therefore, they do not heat as much. They can operate at higher frequencies. Core is 80 sq. mm. in area.
Available from 1700+ (1.466GHz) to 2200+ (1.8GHz)
Athlon XP (Thoroughbred B):
Launched with the XP 2400+ (2GHz). Bus is 266mhz (133 FSB) and 333mhz (166 FSB). It's practically the same as the TBred A, but the manufacturing process is refined, has more layers, and it's fabricated at FAB30 in Dresden, Germany. Core was then made in a 0.13µ. process. Core is 84 sq. mm. in area.
Available from 1700+ (1.466GHz) to 2800+ (2.250GHz)
Athlon XP (Palomino):
Were launched after the Tbirds. Also 0.18µ, with 256KB of L2 Cache and all operate at 266mhz bus (133 FSB). Core is also 128 sq. mm.
SSE instruction set was implemented (from Pentium 3s)
Available from 1500+ (1.333GHz) to 2100+ (1.7GHz).
Table for AthlonXP recognition:
Athlon MP CPUs:
Opteron CPUs:
High-end CPUs to directly compete against Intel Xeons. All currently available with 1mb L2 cache and socket 940.
Duron (Applebred) CPUs:
Low end CPUs, to directly compete against Intel Celerons, beating them by a good margin.

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