Rack Servers6Rack servers are dedicated servers installed in a low-profile enclosure containing multiple bays where the servers are installed, minimizing the need for space and simplifying supplying power; however cooling the confined space where the servers are crowded is a priority.IBM POWER9 Servers1https://media.trustradius.com/vendor-logos/yf/sf/DNSXTG99HOK3-180x180.JPEGIBM Z2https://media.trustradius.com/product-logos/yf/sf/2NN87UADJVBJ-180x180.JPEGCisco UCS C-Series3https://media.trustradius.com/vendor-logos/KP/BJ/EKH5RFTLCO4X-180x180.PNGIBM Power Systems AC9224https://media.trustradius.com/product-logos/AT/EL/WM0B3I7B2EBN-180x180.JPEGHPE ProLiant DL5https://media.trustradius.com/vendor-logos/qq/uK/ZTECRXT03ME3-180x180.JPEGIBM LinuxONE6https://media.trustradius.com/vendor-logos/yf/sf/DNSXTG99HOK3-180x180.JPEGDell PowerEdge R7https://media.trustradius.com/vendor-logos/QU/Ro/1VKOUZJX2NK3-180x180.PNGHitachi Unified Compute Platform RS Series8https://media.trustradius.com/vendor-logos/RG/Yt/MJIDJV0VP3AN-180x180.JPEGDell PowerEdge C9https://media.trustradius.com/vendor-logos/QU/Ro/1VKOUZJX2NK3-180x180.PNGIntel Server System10https://media.trustradius.com/vendor-logos/Ew/IS/Q672JHANLJ3S-180x180.JPEGLenovo ThinkServer RS Series11https://media.trustradius.com/vendor-logos/LR/zp/V0HPUC83UP3G-180x180.JPEGLenovo ThinkSystem SR Series12https://media.trustradius.com/vendor-logos/LR/zp/V0HPUC83UP3G-180x180.JPEGQuantaGrid13https://media.trustradius.com/vendor-logos/Fa/m7/5ZT2G6EZN7X3-180x180.JPEGQCT Rackgo X14https://media.trustradius.com/vendor-logos/Fa/m7/5ZT2G6EZN7X3-180x180.JPEGIEI GRAND Series15https://media.trustradius.com/vendor-logos/oR/5x/LFDLZUIHFDAS-180x180.JPEGNEC Express5800 Rack Server Series16https://media.trustradius.com/vendor-logos/V7/VJ/1803CSTL26SA-180x180.PNGFujitsu Primergy RX Series17https://media.trustradius.com/vendor-logos/aI/FW/KB0LL6HPRJKM-180x180.JPEGFujitsu PRIMEQUEST Series18https://media.trustradius.com/vendor-logos/aI/FW/KB0LL6HPRJKM-180x180.JPEGSupermicro Ultra19https://media.trustradius.com/vendor-logos/vO/av/1QTLGDZMGXL4-180x180.JPEGiXsystems iX Series20https://media.trustradius.com/vendor-logos/zr/jh/QP40E128COF0-180x180.JPEGClearPath Forward Dorado21https://media.trustradius.com/vendor-logos/ih/uf/FI6S542IVPJK-180x180.JPEGClearPath Forward Libra22https://media.trustradius.com/vendor-logos/ih/uf/FI6S542IVPJK-180x180.JPEGCisco UCS S-Series23https://media.trustradius.com/vendor-logos/KP/BJ/EKH5RFTLCO4X-180x180.PNGIBM Rack Servers24https://media.trustradius.com/vendor-logos/yf/sf/DNSXTG99HOK3-180x180.JPEGIBM Power Systems IC92225https://media.trustradius.com/product-logos/aO/KC/UFFZ3OL0PXCM-180x180.JPEG

Rack Servers Overview

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.

Rack Servers Products

Listings (1-25 of 30)

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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.

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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.

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QCT, a Quanta Computer company headquartered in San Jose, offers a line of high density rack servers, QuantaGrid.

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QCT, a Quanta Computer company headquartered in San Jose, offers Rackgo X, a scale-out rack server.

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The Cisco UCS S-Series (available in the S3260 model) 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. D…

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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.