- Created by the SUN Corporation in 1985.
- Part of the SPARC architecture family, all RISC based.
- Successor to the UltraSparc III, the UltraSPARC IV was expected to be a milestone with its 64-bit Super-scalar architecture.
- Clock speeds started at 1.05 GHz.
- It is essentially two UltraSPARC III cores on a single chip.