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The R4000 is a high-performance microprocessor developed by MIPS Technologies, Inc.

Manufacturer Specifications:

• Architecture: 64-bit RISC (MIPS IV ISA)
• Clock Speed: Up to 100 MHz (varies by model)
• Process Technology: 0.8 µm CMOS
• Transistor Count: ~1.35 million
• Cache:
• L1 Instruction Cache: 16 KB
• L1 Data Cache: 16 KB
• Pipeline: 8-stage superpipelined
• Floating-Point Unit (FPU): Integrated (64-bit)
• Memory Management Unit (MMU): Integrated
• Power Consumption: ~4W (typical)
• Voltage: 5V

Descriptions:

The R4000 was one of the first commercially available 64-bit microprocessors, designed for high-performance computing, workstations, and servers. It introduced MIPS IV instruction set architecture (ISA) enhancements, including improved floating-point performance and superscalar execution capabilities.

Features:

• 64-bit Data Paths: Enables large memory addressing and high-throughput computing.
• Superscalar Execution: Capable of issuing multiple instructions per cycle.
• Integrated FPU: Supports IEEE 754-compliant floating-point operations.
• Large On-Chip Caches: Reduces memory latency for improved performance.
• Multiprocessing Support: Can be used in multi-CPU configurations.
• High Clock Speed (for its era): Competitive performance in scientific and engineering applications.

The R4000 was widely used in Silicon Graphics (SGI) workstations and servers, including the Indigo² and Onyx systems.