Wrong on the demise of the Sparc. Oracle just posted a massively record breaking TPC-C benchmark using their new Sparc T3 servers, something like 30 MILLION TPM.
Oracle has very publically committed to keeping SPARC strong, which is good news for those of us believe in diversity in the compute-verse. Even so, SPARC is also supported by Fujitsu, so as they... "[SPARC's] demise has been greatly exaggerated."
There's also Power aka PPC, formerly used in Apple Macintosh computers, and still used on large scale IBM AIX Unix servers, the Power series. These also are very high performance.
Just a minor nit here, POWER is not the same thing as PPC. PPC branched from POWER with strong influences from other vendors and technologies. PPC has since evolved into a mostly embedded platform, though later POWER releases are (mostly) compatible with PPC.
One of my former employers (a fossilized System V UNIX vendor) was part of the alliance that worked on a common UNIX implementation for this processor family, which sadly, never came to fruition.