Rack Servers

Rack Servers Overview

A server is a high powered computer designed to store, retrieve and send computer files and data. It processes requests from client computers or programs and delivers the data via the internet or local network. Rack servers, or rack-mounted servers, are servers that are designed to be installed in a low-profile enclosure (rack) designed to hold IT equipment.


These racks contain multiple vertical bays where the servers are installed, minimizing the need for floor space and simplifying supplying power; however cooling the confined space where the servers are crowded is a necessity. When a server is mounted in a rack, it is usually done so with a rail kit that allows the server to slide in and out of the rack to provide easy in-rack serviceability.

Rack Servers Products

(1-25 of 31) Sorted by Most Reviews

IBM POWER9 Servers
70 ratings
28 reviews
IBM offers the POWER9 series of servers, available in scale-out or scale-up variants.
IBM Z
45 ratings
24 reviews
IBM Z is the company's mainframe enterprise server solution product line.
Dell PowerEdge R
30 ratings
22 reviews
Dell's PowerEdge R is a line of rack servers.
Cisco UCS Series
48 ratings
17 reviews
The Cisco UCS Series is a modular, high-density, high-availability, dual-node storage- optimized server suited for service providers, enterprises, and industry-specific environments. It provides dense, cost-effective storage to address your ever-growing data needs. Designed for a new class of data-i…
HPE ProLiant DL
13 ratings
13 reviews
HPE ProLiant DL is a rack server, from Hewlett-Packard Enterprise.
IBM Power Systems AC922
12 ratings
10 reviews
The IBM AC922 and LC922 line of servers are storage-rich servers designed to support high data throughput and scalability needs.
IBM Power Systems S914
2 ratings
8 reviews
IBM® Power System S914 provides the data and compute-intensive infrastructure needed to deliver faster time to insights. Power S914 enables the cutting-edge AI innovation data scientists desire, with the dependability IT requires. This is IT infrastructure redesigned for enterprise AI.
IBM Power Systems S924
4 ratings
3 reviews
IBM® Power System™ S924 provides the data and compute-intensive infrastructure needed to deliver faster time to insights. Power S924 enables the cutting-edge AI innovation data scientists desire, with the dependability IT requires. This is IT infrastructure redesigned for enterprise AI.
IBM Power Systems IC922
2 ratings
2 reviews
IBM's Power System IC922 server is a server designed for AI inference. It leverages IBM's Power9 technology to optimize for AI-based modelling and simulations. The IC922 is designed to be scalable with businesses' growth and expanded AI inference needs.
IBM LinuxONE
27 ratings
2 reviews
IBM LinuxONE is the company's high performance scalable mainframe servers, available in the Rockhopper and Emperor editions.
IBM Power Systems LC922
2 ratings
1 review
IBM's Power System LC922 is a rack server designed for big data storage. Using IBM's Power9 technology, the LC922 specializes in satisfying heavy storage requirements, such as data lakes. It is also intended to meet Linux workloads with large storage requirements.
Oracle SPARC Servers
8 ratings
1 review
Oracle offers their SPARC line of rack servers designed, as described by the vendor, as optimal for scale-out and Cloud infrastructure.
Hitachi Unified Compute Platform RS Series
Hitachi Vantara offers the Hitachi Unified Compute Platform RS series (Hitachi UCP RS) to support rack-scale infrastructure.
Dell PowerEdge C
Dell's PowerEdge C6420 is a density optimized server designed to support HPC and scale-out workloads with a flexible platform that offers up to 4 dual-socket servers and high-capacity storage in a 2U rack.
Intel Server System
Intel offers rack servers, the Intel Server System was launched in early 2016 and presents a family of rack servers.
Lenovo ThinkSystem SR Series
Lenovo offers the ThinkSystem SR series of rack servers, offering a wide range of options boasting price, power, or low foot print as desired. Presently Lenovo's ThinkSystem series of rack servers includes the SR250, SR530, SR550, SR570, SR590, SR630, SR650, and the SR670.
QCT Rackgo X
QCT, a Quanta Computer company headquartered in San Jose, offers Rackgo X, a scale-out rack server.
Lenovo ThinkServer RS Series
Lenovo offers the ThinkServer RS series of rack servers, Lenovo's entry level servers boasting affordability and a low footprint.
QuantaGrid
QCT, a Quanta Computer company headquartered in San Jose, offers a line of high density rack servers, QuantaGrid.
IEI GRAND Series
IEI Integration Corp headquartered in Taipei City offers the GRAND series of rackmount servers.
NEC Express5800 Rack Server Series
NEC offers the Express5800/100 rack server series.
iXsystems iX Series
iXsystems headquartered in San Jose offers the iX series of rackmount servers.
ClearPath Forward Libra
Unisys offers the enterprise grade ClearPath Forward Libra series of servers.
Supermicro Ultra
Supermicro Ultra is the company's line of higher end rack servers.

Learn More About Rack Servers

What are Rack Servers?

A server is a high powered computer designed to store, retrieve and send computer files and data. It processes requests from client computers or programs and delivers the data via the internet or local network. Rack servers, or rack-mounted servers, are servers that are designed to be installed in a low-profile enclosure (rack) designed to hold IT equipment.


These racks contain multiple vertical bays where the servers are installed, minimizing the need for floor space and simplifying supplying power; however cooling the confined space where the servers are crowded is a necessity. When a server is mounted in a rack, it is usually done so with a rail kit that allows the server to slide in and out of the rack to provide easy in-rack serviceability.

What is a Rack Unit?

A rack unit, designated as “U”, is a unit of measurement for standardizing rack servers, racks, and other rack-mounted IT equipment. A rack unit equals 1.75 inches or 44.45 mm. Standard rack heights are designated as 1U, 2U, 3U, and 4U (equal to 1.75”, 3.5”, 5.25”, and 7”). A 2U rack server will, therefore, have a height of 2.5 inches. There are three available widths of rack servers (19”, 23”, and 24”) but 19 inches wide is the most common.

Server Memory

Without delving too deeply into the mechanics of memory, installed server memory is usually SRAM, DRAM, or ECC. Static random access memory (SRAM) is the fastest and the RAM speed is expressed as DDR1, DDR2, etc. SRAM is usually not user replaceable. Dynamic access memory (DRAM) is less expensive but slightly slower than SRAM. It is also replaceable by the user. ECC stands for error-correcting code and has a self checking software that identifies and corrects any errors that might creep into volatile memory. ECC is a type of DRAM that user replaceable but must be compatible with other computer hardware.

Rack Servers Features & Capabilities

  • Hot swapping - The capability to replace or add components without shutting down the system

  • The ability to update software without a restart or reboot

  • Advanced backup capability for frequent backup of critical data

  • Redundant power supplies

  • Advanced networking performance

  • Automatic (invisible to the user) data transfer between devices.

  • High security for resources, data and memory protection

  • Powerful cooling fans or water cooling systems

  • Advanced self-monitoring, such as overheating and disk failure

  • Various Connectivity capabilities: USB, video, serial cable

  • Number of processor cores - multiple cores speed up processing times and capabilities

Pricing Information

The prices for rack servers vary greatly. The biggest specs that impact price include server speed, memory, storage capability, and integrated security features. Low end rack servers start around $1,000 and range to more than $70,000 for very high end enterprise level servers.