"The naming conventions used for the ThinkServers — RS110,
RD120, TD100, TD100x and TS100 — are fairly standard: The R
stands for Rack, T stands for Tower, S stands for Single (as in
single core) and the D means Dual Core. All servers come with a
one-year warranty (except the TD100x, which has a three year) and a
90-day trial of the priority support package that covers you during
the first three months of ownership. Each box is compatible with
the Windows, Linux, Red Hat and VMware operating systems."