From the Wikipedia:
RISC System/6000, or RS/6000 for short
****************************** E XCE RPT****************
RISC System/6000, or RS/6000 for short, is a family of RISC and UNIX based servers, workstations and supercomputers made by IBM in the 1990s. The RS/6000 family replaced the IBM RT computer platform in February 1990 and was the first computer line to see the use of IBM's POWER and PowerPC based microprocessors. RS/6000 was renamed eServer pSeries in October 2000.
RISC is alive and well, everyone except intel uses RISC and intel adopted a lot RISC features in it’s chips. The link I posted above points to IBMs new Power (RISC) processor.