Arguably workstations as a meaningful category largely died out when wintel took over the world. So Sun Ultras, SGI MIPS, HP PA-RISC, DEC Alphas, and IBM POWER

Arguably workstations as a meaningful category largely died out when wintel took over the world. So Sun Ultras, SGI MIPS, HP PA-RISC, DEC Alphas, and IBM POWER belong to workstations. Wintel PCs are, well, PCs. It is notable how for almost all of these venerable series the last models came out in fairly similar time (2005 ±few years).