So the CPU inside my AMD Shuttle box (an SN45 with the latest, FN45S00W BIOS) is marked AXDA2600DKV4D, which means it’s a Barton-core XP 2600+ @ 1917 MHz with a 333 MHz bus (166 MHz external frequency) and a 11.5 multiplier. The manufacturing code, AFAICT, is AQZFA0348MPM, which in turn means the multiplier’s locked (the unlocked ones were made prior to week 39 of 2003, or 0339, according to OC forums).
The single memory module it’s accompanied by currently is a 512 MB Elixir PC3200U @ 400 MHz, marked CL3. And apparently I just destroyed it while gathering this data.