Like the OpenVMS and SGI (IRIX) systems threads: Same deal, post what kind of Sun (or Oracle, nowadays) systems you have or that you (have) otherwise use(d)! Either at home, or perhaps what you use at work, university or so.
A Sun system is primarily understood to be SPARC-based (Sun-4, with MC68000 in the Sun-3 days) and running Solaris (or, SunOS). The modern x86/-64 (e.g. AMD Opteron) systems don’t interest me much, but you’re free to name them if you wish to. Especially if you run Solaris x86/-64.
Like in the other threads: Perhaps say a thing or two about the specifications (for example, include a [FONT=“Courier New”]psrinfo[/FONT] output), pictures and tell us what you use it for? All is welcome!