Fastest Athlon XP on the block

My beloved Athlon XP-M 2600+. Should run at 2GHz - Runs at an astonishing 2640Mhz! She has the best of the best cores - the IQYHA week 52, 2003. She's a Barton so she has 512kB of cache - twice that of her Thoroughbred B sister below. She's currently purring away in an ABIT NF7-S V2.0(far and away the best Socket A motherboard)with the help of a Thermalright 947U.