I own the S2466N not the S2466N-4M:-(
I asked this question to Tyan techsupport, and they repliedQUOTE
The MP2600+ CPU's definantly will work on your S2466N motherboard
and later they also replied, on a question what was the barton update in bios 1.04QUOTE
That updated the CPU Microcoding for the S2466N so that the 2600+ Barton
CPU's would be picked up correctly. We found that without this update the
2600+ Barton CPU's would not be picked up correctly.
see this linklink
> >> 2600+ AMSN2600DUT4C
> >> 2800+ AMSN2800DUT4C
are both bartons....
WHY THE [content edited] does the MP2800+ does not work !!!