R4200

The R4200 is a microprocessor designed by MIPS Technologies that implemented the MIPS III instruction set architecture and was initially referred to as the VRX during development. MIPS, which had no production capability of its own, licensed the design to NEC, which fabricated and marketed it as the VR4200. The first VR4200, running at 80 MHz, was introduced in 1993, with a faster 100 MHz version following in 1994.

Primarily aimed at low-power Windows NT systems such as personal computers and laptops,^: 468 the R4200 was marketed as offering "Pentium processor performance at a tenth of the price." It was initially expected to deliver twice the performance of a 66 MHz Intel 486DX2 processor. SPECint benchmark results showed the microprocessor’s integer performance at approximately 85% of the original Pentium, while its floating-point performance was about half that of the Pentium.

The R4300i is a derivative of the R4200, designed by MIPS for embedded applications. A variant of the R4300i was used in the widely popular Nintendo 64 and SNK's Hyper Neo Geo 64 arcade board.

The R4200 never saw use in personal computers and was eventually repositioned as an embedded microprocessor complementing the R4600.