HP earlier this week released more replacement part numbers for some of the other Mini-Note 2133 motherboards. The part #: is 482276-001 and it's information can be seen below.
This specific PN has the following specifications - "HP System board with processor - 1.2GHz VIA C7-M ultra low voltage processor (800MHz front side bus, 5W thermal design power) - Includes ExpressCard assembly, fan/heat sink, RTC battery, and replacement thermal material".
I personally own a HP Mini-Note 2133 with the 1.6GHz and think it's a solid unit and I am not worried about the motherboard failing anytime soon... cross my fingers lol.
HP Compaq Mini-Note 2133 1.2GHz Motherboard 482276-001
Sale Price: $12.05 on eBay.com