The NVAX is a CMOS microprocessor developed and produced by Digital Equipment Corporation (DEC) that implemented the VAX instruction set architecture (ISA). A variant of the NVAX, the NVAX+, differed in the bus interface and external cache supported, but was otherwise identical in regards to microarchitecture. The NVAX+ was designed to have the same bus as the DECchip 21064, allowing drop-in replacement. The final model in the series was the NVAX++, or NV5, offering 50 VUPs. This was the last VAX processor, DEC had moved entirely to the DEC Alpha after that point.