Why Servers Matter: Architecture, Types, and the X86 vs ARM Showdown

Introduction

Servers are high‑performance computers that provide services to client devices across networks, forming the core of cloud computing and data‑center infrastructures. Compared with ordinary PCs, servers demand higher stability, security, and performance, which is reflected in their hardware, firmware, and operating system choices.

1. What Is a Server?

A server (the English term “Server”) is a network node that stores, processes, and delivers roughly 80% of data traversing the internet, earning it the nickname “the soul of the network.” While functionally similar to a PC, a server’s design emphasizes continuous operation, robust security, and superior computational capability.

2. Server Composition

2.1 Logical Architecture

The logical architecture of a server mirrors that of a PC but with stricter requirements for processing power, reliability, and manageability. The CPU and memory remain the most critical components, handling logical operations and data storage respectively.

2.2 Hardware

Key hardware elements include processors, memory, chipsets, I/O controllers (RAID cards, network cards, HBAs), storage drives, and chassis components such as power supplies and fans. Cost breakdown for a typical server is roughly 50% CPU & chipset, 15% memory, 10% external storage, and 25% other hardware.

2.3 Firmware and Operating System

Server firmware typically comprises BIOS or UEFI, Baseboard Management Controller (BMC), and CMOS. The BIOS/UEFI initializes hardware and hands control to the OS, while the BMC enables out‑of‑band management such as remote firmware updates. Servers run either 32‑bit or 64‑bit operating systems, with 64‑bit versions offering greater memory and application handling capabilities.

3. Server Classification

3.1 By Form Factor

Servers are categorized as tower, rack, blade, or cabinet units. Tower servers are standalone units suitable for small offices; rack servers follow a 19‑inch, “U”‑height standard for dense data‑center deployment; blade servers pack multiple server boards into a shared chassis for high density; cabinet servers integrate compute, storage, and networking into a single enclosure, targeting next‑generation data‑center architectures.

3.2 By Instruction‑Set Architecture (ISA)

Servers fall into CISC (X86), RISC (e.g., Power, SPARC, ARM‑based Kunpeng), and EPIC (e.g., Intel Itanium) families. X86 servers dominate the market, while RISC and EPIC servers are collectively referred to as non‑X86 servers.

3.3 By CPU Count

Servers are described as single‑socket, dual‑socket, quad‑socket, or octa‑socket, indicating the number of CPUs installed. Dual‑socket servers are currently the most common, leveraging symmetric multiprocessing (SMP) to share memory and I/O across CPUs, dramatically boosting processing throughput.

3.4 By Application Type

Depending on workload, servers are specialized as file servers, database servers, or application servers. File servers focus on high‑throughput storage access, database servers prioritize I/O and memory for query performance, while application servers demand strong CPU capability to handle concurrent user requests.

4. The X86 vs ARM Competition

The server market now exhibits a dual‑strength landscape: X86 servers, led by Intel and AMD, dominate traditional workloads, whereas ARM‑based servers, championed by vendors such as Huawei’s Kunpeng, target energy‑efficient and scale‑out scenarios. Both architectures coexist, each offering distinct advantages.

4.1 X86 Market Share and Trends

According to Gartner, in 2019 X86 servers accounted for 1249.7 million units and $69.36 billion in sales, far outpacing non‑X86 servers. In China, the “new‑infrastructure” policy is projected to drive a 9.1% CAGR for X86 server shipments from 2020 to 2024. Intel’s upcoming 10 nm Ice Lake‑SP processors, offering up to 38 cores and 76 threads, are expected to further stimulate X86 server adoption.