What Drives the Global CPU Landscape? From Intel’s Legacy to ARM’s Rise

CPU (Central Processing Unit) is the core of a computer, executing instructions and processing data while interacting with memory and I/O devices.

CPU Workflow and Main Units

Typical von Neumann CPU workflow includes fetch, decode, execute, memory access, and write‑back. The control unit directs data flow, the arithmetic‑logic unit performs calculations, and registers/cache store intermediate data, reducing memory latency.

Historical Milestones

1971 Intel introduced the 4004, the first commercial microprocessor (4‑bit, 2 µm process, 2 in wafer, 2 300 transistors, 740 kHz). By 2020 the 11th‑gen Core chips on 10 nm integrate over 100 billion transistors, reach 4.8 GHz, and combine cores, GPU, memory controller, media engines, and other components.

Instruction‑Set Evolution

CPU architectures split into CISC (complex instruction set) and RISC (reduced instruction set). X86 (CISC) dominates servers, desktops and PCs; its lineage from MMX to AVX‑512 expanded vector width from 64‑bit to 512‑bit, boosting per‑instruction throughput eight‑fold.

RISC vs CISC Competition

RISC designs (e.g., ARM, MIPS) feature many registers, simple pipelines, low power, and excel in parallel workloads. Since the 1980s ARM has dominated mobile devices (≈90 % of smartphones) and is expanding into servers (Neoverse) and desktops (Apple Silicon, Windows on ARM).

Emerging RISC‑V

RISC‑V, an open ISA launched in 2010 by UC Berkeley, offers a royalty‑free, extensible architecture. Its ecosystem grew 133 % in 2020; it targets IoT, edge and custom silicon, attracting dozens of tech companies (IBM, NXP, Nvidia, Qualcomm, Samsung, Google, Huawei, Alibaba, Red Hat, Tesla). Forecasts predict >6 × 10¹⁰ RISC‑V chips by 2025.

Chinese Domestic CPU Landscape

China’s “Taishan” and “863” programs fostered indigenous CPUs such as Loongson (MIPS‑based), Phytium, Kunpeng (ARM‑based), and Sunway (Alpha‑based). These chips have progressed from early 4‑bit designs to multi‑core processors used in supercomputers (e.g., Sunway TaihuLight) and servers.

Market Share Overview

In non‑x86 segments, ARM holds ≈43 % market share, RISC‑V is gaining niche footholds, MIPS ≈9 % and Power remains in enterprise. X86 still dominates servers (Intel ≈96 % share, AMD rising from 1 % to 4 % in 2018‑19) and desktops, but ARM‑based PCs are emerging.

Future Outlook

ARM’s licensing model drives billions of chips annually; non‑x86 server shipments grew 60 % YoY in 2019, reaching $5.2 B. RISC‑V’s open nature may accelerate custom silicon for IoT and edge, while Chinese manufacturers aim for greater autonomy by adapting ARMV8/V9 or developing native ISAs.