Notes:

Doesn't support Coppermine due to outdated voltage regulator module.

Likely original revision of the ASUS P2B, however there are multiple variants. Some feature these differences: 1.04. version with a dot 1.04 = version without a dot.

Some also feature DA6 and DA7 or D7 and S4 quality control stamps above the chipset While other boards features the DA5 and Q24 stamps below the chipset.

The backside on some also feature different manufacturer names while some have no manufacturer name. It is ultimately not clear if or which of these exactly are clones/fakes as asus reports in their manual which makes the mistake of comparing a 1.10 board to a supposed fake 1.04 board.

Functionally we see no actual difference between these 1.04 variants. Though some may feature lower cost capacitors. It is likely though that even on original 1.04 boards the capacitors have long since degraded and are due for replacement.

More data is required to resolve this conclusively

More info in CPU Upgrade and support: https://web.archive.org/web/20190823065341/http://homepage.hispeed.ch/rscheidegger/p2b_procupgrade_faq.html