 It supported up to 128 MB of memory.The VAX 4000 Model 400, code-named "Slow-"mega"", was a distributed server, positioned as a mid-range VAX 4000 system, introduced on 7 July 1992.It used the KA675 CPU module containing a 63 MHz (16 ns) NVAX microprocessor with uCode patch changes to slow it down beyond the cycle scaling, with 128 KB of external tertiary cache.