This is a non-exhaustive list of Shuttle XPC systems currently indexed by this wiki. This targets mostly the mid-2000s, with some 2010s outliers that might be good for retro use (like the SH61R4 having full XP support). If you want some general knowledge about the XPC line, I recommend you start with the Shuttle chassis breakdown page first.
As of right now this list will be sorted by what chipset said model is equipped with.
These models begin with SB- or in later models SG or SH.
These models begin with SN-.