VUPs (VAX Unit of Performance) . The MIPS R3000A -compatible R3051 32-bit RISC chip running at 33.8688 MHz was the processor used in the Sony PlayStation . Third-party designs include Performance Semiconductor's R3400 and IDT's R3500 , both of them were R3000As with an integrated R3010 FPU. Toshiba 's R3900 was