A desktop computer is a personal computer
designed for regular use at a single location on or near a desk
or table due to its size and power requirements
. The most common configuration has a case
that houses the power supply
(a printed circuit board
with a microprocessor
as the central processing unit
, and other electronic components), disk storage
(usually one or more hard disk drive
s, solid state drive
s, optical disc drive
s, and in early models a floppy disk drive
); a keyboard
; and a computer monitor
, and, often, a printer
for output. The case may be oriented horizontally or vertically
and placed either underneath, beside, or on top of a desk.
Prior to the widespread use of microprocessors, a computer that could fit on a desk was considered remarkably small; the type of computers most commonly used were minicomputers
, which were themselves desk-sized. Early computers took up the space of a whole room. Minicomputers generally fit into one or a few refrigerator-sized racks.
It was not until the 1970s when fully programmable computers appeared that could fit entirely on top of a desk. 1970 saw the introduction of the Datapoint 2200
, a "smart" computer terminal
complete with keyboard and monitor, was designed to connect with a mainframe computer
but that didn't stop owners from using its built-in computational abilities as a stand-alone desktop computer.
"Forgotten PC history: The true origins of the personal computer"
, ''Computerworld'', 8 August 2008
The HP 9800 series
, which started out as programmable calculators in 1971 but was programmable in BASIC
by 1972, used a smaller version of a minicomputer
design based on ROM memory and had small one-line LED alphanumeric displays and displayed graphics with a plotter. The Wang 2200
of 1973 had a full-size cathode ray tube
(CRT) and cassette tape storage. The IBM 5100
in 1975 had a small CRT display and could be programmed in BASIC and APL
. These were generally expensive specialized computers sold for business or scientific uses.
Growth and development
and Commodore PET
were first generation personal home computer
s launched in 1977, which were aimed at the consumer market – rather than businessmen or computer hobbyists. ''Byte'' magazine
referred to these three as the "1977 Trinity" of personal computing. Throughout the 1980s and 1990s, desktop computers became the predominant type, the most popular being the IBM PC
and its clones
, followed by the Apple Macintosh
with the third-placed Commodore Amiga
having some success in the mid-1980s but declining by the early 1990s.
Early personal computers, like the original IBM Personal Computer
, were enclosed in a "desktop case", horizontally oriented to have the display screen placed on top, thus saving space on the user's actual desk, although these cases had to be sturdy enough to support the weight of CRT displays that were widespread at the time. Over the course of the 1990s, desktop cases gradually became less common than the more-accessible tower case
s (Tower was a trademark of NCR created by ad agency Reiser Williams deYong) that may be located on the floor under or beside a desk rather than on a desk. Not only do these tower cases have more room for expansion, they have also freed up desk space for monitors which were becoming larger every year. Desktop cases, particularly the compact form factors, remain popular for corporate computing environments and kiosks. Some computer cases can be interchangeably positioned either horizontally (desktop) or upright (mini-tower).
Influential games such as ''Doom
'' and ''Quake
'' during the 1990s had pushed gamers
to frequently upgrade to the latest CPUs and graphics cards
, and Nvidia
) for their desktops (usually a tower case) in order to run these applications, though this has slowed since the late 2000s as the growing popularity of Intel integrated graphics forced game developers to scale back. Creative Technology
's Sound Blaster
series were a ''de facto
'' standard for sound cards in desktop PCs during the 1990s until the early 2000s, when they were reduced to a niche product, as OEM desktop PCs came with sound boards integrated directly onto the motherboard.
While desktops have long been the most common configuration for PCs,
by the mid-2000s the growth shifted from desktops to laptops.
Notably, while desktops were mainly produced in the United States, laptops had long been produced by contract manufacturer
s based in Asia, such as Foxconn
. This shift led to the closure of the many desktop assembly plants in the United States by 2010. Another trend around this time was the increasing proportion of inexpensive base-configuration desktops being sold, hurting PC manufacturers such as Dell
whose build-to-order customization of desktops relied on upselling added features to buyers.
Battery-powered portable computers had just a 2% worldwide market share in 1986. However, laptops have become increasingly popular, both for business and personal use.
Around 109 million notebook PCs shipped worldwide in 2007, a growth of 33% compared to 2006.
[Worldwide notebook shipments grow 33% on year in 2007, says IDC](_blank)
31 January 2008, Yen Ting Chen, DigiTimes, retrieved at 12 September 2011
In 2008, it was estimated that 145.9 million notebooks were sold and that the number would grow in 2009 to 177.7 million.
[Analysis: Did Intel underestimate netbook success?](_blank)
Accessed at 10 January 2009
The third quarter of 2008 was the first time when worldwide notebook PC shipments exceeded desktops, with 38.6 million units versus 38.5 million units.
[Notebook PC Shipments Exceed Desktops for First Time in Q3](_blank)
isuppli.com, accessed at 13 January 2009
The sales breakdown of the Apple Macintosh
has seen sales of desktop Macs staying mostly constant while being surpassed by that of Mac notebooks whose sales rate has grown considerably; seven out of ten Macs sold were laptops in 2009, a ratio projected to rise to three out of four by 2010. The change in sales of form factors is due to the desktop iMac moving from affordable (iMac G3
) to upscale (iMac G4
) and subsequent releases are considered premium all-in-ones. By contrast, the MSRP of the MacBook laptop lines have dropped through successive generations such that the MacBook Air and MacBook Pro constitute the lowest price of entry to a Mac, with the exception of the even more inexpensive Mac Mini (albeit without a monitor and keyboard), not surprisingly the MacBooks are the top-selling form factors of the Macintosh platform today.
The decades of development mean that most people already own desktop computers that meet their needs and have no need of buying a new one merely to keep pace with advancing technology. Notably, the successive release of new versions of Windows
(Windows 95, 98, XP, Vista, 7, 8, 10 and so on) had been drivers for the replacement of PCs in the 1990s, but this slowed in the 2000s due to the poor reception of Windows Vista over Windows XP. Recently, some analysts have suggested that Windows 8
has actually hurt sales of PCs in 2012, as businesses have decided to stick with Windows 7
rather than upgrade.
Some suggested that Microsoft has acknowledged "implicitly ringing the desktop PC death knell" as Windows 8 offers little upgrade in desktop PC functionality over Windows 7
; instead, Windows 8's innovations are mostly on the mobile side.
The post-PC trend
has seen a decline in the sales of desktop and laptop PCs.
The decline has been attributed to increased power and applications of alternative computing devices, namely smartphones and tablet computers. Although most people exclusively use their smartphones and tablets for more basic tasks such as social media
and casual gaming
, these devices have in many instances replaced a second or third PC in the household that would have performed these tasks, though most families still retain a powerful PC for serious work.
Among PC form factors, desktops remain a staple in the enterprise market but have lost popularity among home buyers. PC makers and electronics retailers have responded by investing their engineering and marketing resources towards laptops (initially netbook
s in the late 2000s, and then the higher-performance Ultrabook
s from 2011 onwards), which manufacturers believe have more potential to revive the PC market
In April 2017, StatCounter declared a "Milestone in technology history and end of an era" with the Android operating system more popular than Windows (the operating system that made desktops dominant over mainframe computer
s). Windows is still most popular on desktops (and laptops), while smartphones (and tablets) use Android
(Apple products) or Windows 10 Mobile
Although for casual use traditional desktops and laptops have seen a decline in sales, in 2018, global PC sales experienced a resurgence, driven by the business market. Desktops remain a solid fixture in the commercial and educational sectors. In addition, gaming desktops
have seen a global revenue increase of 54% annually. For gaming, the global market of gaming desktops, laptops, and monitors is expected to grow to 61.1 million shipments by the end of 2023, up from 42.1 million, with desktops growing from 15.1 million shipments to 19 million. PC gaming as a whole now accounts for 28% of the total gaming market as of 2017. This is partially due to the increasing affordability of desktop PCs.
Full-sized desktops are characterized by separate display and processing components. These components are connected to each other by cables or wireless connections
. They often come in a tower
form factor. These computers are easy to customize and upgrade per user requirements, e.g. by expansion card
An ''all-in-one'' desktop computer integrates the system's internal components into the same case as the display, thus occupying a smaller footprint (with fewer cables) than desktops that incorporate a tower.
The all-in-one form factor was popular during the early 1980s for personal computers intended for professional use such as the Kaypro II
, Osborne 1
, TRS-80 Model II
and Compaq Portable
. Many manufacturers of home computer
s like Commodore
included the computer's motherboard into the same enclosure as the keyboard
; these systems were most often connected to a television
set for display. Apple has manufactured several popular examples of all-in-one computers, such as the original Macintosh
of the mid-1980s and the iMac
of the late 1990s and 2000s. Some all-in-one desktops, such as the iMac G4
, have used laptop components in order to reduce the size of the system case. By the mid 2000s, many all-in-one designs have used flat panel display
s, and later models have incorporated touchscreen
displays, allowing them to be used similarly to a mobile tablet
Like most laptops, some all-in-one desktop computers are characterized by an inability to customize or upgrade internal components, as the systems' cases do not provide convenient access to upgradable components, and faults in certain aspects of the hardware may require the entire computer to be replaced, regardless of the health of its remaining components.] There have been exceptions to this; the monitor portion of HP's Z1 workstation can be angled flat, and opened like a vehicle hood for access to internal hardware.
Compact desktops are reduced in physical proportions compared to full-sized desktops. They are typically small-sized, inexpensive, low-power computers designed for basic tasks such as web browsing, accessing web-based applications, document processing, and audio/video playback. Hardware specifications and processing power are usually reduced and hence make them less appropriate for running complex or resource-intensive applications. A nettop is an example of a compact desktop.
These desktops are connected to home entertainment systems and typically used for amusement purpose. They come with high definition display, video graphics, surround sound and TV tuner systems to complement typical PC features.
Over time some traditional desktop computers have been replaced with thin clients utilizing off-site computing solutions like the cloud. As more services and applications are served over the internet from off-site servers, local computing needs decrease, this drives desktop computers to be smaller, cheaper, and need less powerful hardware. More applications and in some cases entire virtual desktops are moved off-site and the desktop computer only runs an operating system or a shell application while the actual content is served from a server. Thin client computers may do almost all of their computing on a virtual machine in another site. Internal, hosted virtual desktops can offer users a completely consistent experience from anywhere.
On January 29 2021 Shenzhen SpinQ Technology announced that they will release the first-ever desktop quantum computer. this will be a miniaturized version of their previous quantum computer based on the same technology (nuclear magnetic resonance) and will be 2 qubit device. Applications will mostly be educational for high school and college students. the company claims spinq will be released to the public by the fourth quarter of 2021.
Comparison with laptops
Desktops have an advantage over laptops in that the spare parts and extensions tend to be standardized, resulting in lower prices and greater availability. For example, the size and mounting of the motherboard are standardized into ATX, microATX, BTX or other form factors. Desktops have several standardized expansion slots, like conventional PCI or PCI Express, while laptops only tend to have one mini-PCI slot and one PC Card slot (or ExpressCard slot). Procedures for assembly and disassembly of desktops tend to be simple and standardized as well. This tends not to be the case for laptops, though adding or replacing some parts, like the optical drive, hard disk, or adding an extra memory module is often quite simple. This means that a desktop computer configuration, usually a tower case, can be customized and upgraded to a greater extent than laptops. This customization has kept tower cases popular among gamers and enthusiasts.
Another advantage of the desktop is that (apart from environmental concerns) power consumption is not as critical as in laptop computers because the desktop is exclusively powered from the wall socket. Desktop computers also provide more space for cooling fans and vents to dissipate heat, allowing enthusiasts to overclock with less risk. The two large microprocessor manufacturers, Intel and AMD, have developed special CPUs for mobile computers (i.e. laptops) that consume less power and lower heat, but with lower performance levels.
Laptop computers, conversely, offer portability that desktop systems (including small form factor and all-in-one desktops) can not due to their compact size and clamshell design. The laptop's all-in-one design provides a built-in keyboard and a pointing device (such as a trackpad) for its user and can draw on power supplied by a rechargeable battery. Laptops also commonly integrate wireless technologies like WiFi, Bluetooth, and 3G, giving them a broader range of options for connecting to the internet, though this trend is changing as newer desktop computers come integrated with one or more of these technologies.
A desktop computer needs a UPS to handle electrical disturbances like short interruptions, blackouts, and spikes; achieving an on-battery time of more than 20–30 minutes for a desktop PC requires a large and expensive UPS.
[Cost of AP]
/ref> A laptop with a sufficiently charged battery can continue to be used for hours in case of a power outage and is not affected by short power interruptions and blackouts.
A desktop computer often has the advantage over a comparable laptop in computational capacity. Overclocking is often more feasible on a desktop than on a laptop; similarly, hardware add-ons such as discrete graphics co-processors may only be possible to install in a desktop.
* Home computer
* Gaming computer
* Single board computer
* Desktop replacement computer
* Legacy ports
* Operating system
of major components of a desktop computers at HowStuffWorks
Category:Classes of computers