 It used the KA680 CPU module containing a 71.43 MHz (14 ns cycle time) NVAX microprocessor with 128 KB of external tertiary cache.The VAX 4000 Model 100, code-named ""Cheetah-Q"", is an entry-level VAX 4000 system introduced on 7 July 1992.It used the KA52 CPU module containing a 72 MHz (14 ns cycle time) NVAX microprocessor with 128 KB of external tertiary cache.