According to size
• Supercomputers
• Mainframe Computers
• Minicomputers
• Workstations
• Microcomputers, or Personal Computers
According to speed
There may be many 'standards' as there are no standard... standards! In other words, there is no *official* sizing classification.
However, typically in use by IT are the following:
Supercomputer/Cluster/Beowulf = A large collection of supercomputers, mainframes, servers, or individual computers. Usually takes up the size of an entire facility, and can be physically very, very massive. Such as BlueGene
Mainframe = Usually one or more 'racks' of refrigerator sized individual systems networked together to allow for extra memory, processing capability, or storage space. Like a smaller version of a supercomputer.
Server = The most common 'large' computer, these are typically one rack cabinet or less, a cabinet the size of a refrigerator or less, and consist of one or more motherboards and individualized computers. Most servers are a single 'rack' on the cabinet, and may work with other racks/servers to perform a task.
My website, for example, has three: There's the server that hosts the main page and data, another which holds the actual database and FTP server, and a third used for our forums!
A server can also just be a normal desktop converted to dedicated use.
Desktop = You probably know this one. =) Smaller desktops may be called MiniATX, MicroITX, NanoITX, or PicoITX, though these more accurately refer to the size of the motherboard and case than the actual computer. May also be called 'portoputers' 'mobile desktops' 'fragboxes' and any of a hundred other things. VIA makes computer desktops smaller than most routers!
Laptop = Ditto. Smaller laptops may be called notebooks, ultra-portables or netbooks.
PDAs = Very small, compact systems smaller than laptops but still capable of full processing. However many lack the memory, storage space, or processor power (due to battery constraints) to run 'normal' operating systems, and use either the more efficient Linux, PalmOS, or Windows CE and similar 'portable device OSs'
Cell Phones = With the advent of smart phones such as the Android, Blackberry, and iPhone, cell phones are completely competative computers now, able to perform all the same tasks and even games as desktop computers were once required for. You can play SimCity 2000 on the iPhone! I remember when you had to buy a desktop to play this because laptops didn't have enough RAM!
There are even smaller devices than this, but these are the ones most commonly used and greed upon.
Conventional "supercomputers" consists of many nodes (which are individual computers) that are networked together (clustered) that is designed to distribute the computational load between all nodes.
Generally speaking they can be generally classified by how many nodes, how many cores, and how much processing power it possesses (in the orders of magnitude of FLOPS[floating-point operations per second, how many calculations per second that a "supercomputer" can do with numbers that contains non-integer values - e.g. 3.1415... - the estimated value of pi])
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Classification based on size refers to grouping or categorizing items or entities according to their physical dimensions. This can be done by separating them into different size classes or ranges to simplify comparisons and analysis.
A computer is a machine that is able to be programmed to perform tasks. Classification is based on application, size, brand, and model.
Digital computers are classified based on their size into microcomputers, minicomputers and mainframe computers. Other types include supercomputers, network computers, laptops, palmtops and PDAs.
Each generation reflected a decrease in hardware size but an increase in computer operation capabilities.
size classification status
Hardware Technology The first generation of computers used vacuum tubes ...Physical Appearance These computers were enormous in size and required a large room for installation. ...The cost of the computer reducedsignificantly, as individual components of ...This era is marked by the development of microprocessor
Form factors are usually the configuration, size and physical arrangement of computer hardware in computers. If one is referring to electric motors, then form factor is known as the amount of rectified current based on a direct current.
the centers of the fasteners,(screws) determine the hardware.
Based on the size and use, computers can be categorized into seven types. They are embedded computers, super computers, main frame computers, servers, game consoles, mobile computers and personal computers.
Classes of computers implies the different classification and categorization of computers according to manufacturer, time of discovery among others. Types of computer focuses on the size and model of a computer.
Computers can be classified by their computing power and/or physical size. At the top are supercomputers. Then mainframes, minicomputers and microcomputers or personal computers ( PC's) Desktops, laptops and notepads are kinds of PC's. The classification is blurred nowadays by networks of smaller computers and the fact that microcomputers get more powerful all the time.
A few of the many criteria for the classification of threatened species are a reduction in population size based on observation, a population size of less than ten thousand mature individuals, and a 10% probability that the species will go extinct within the next 100 years.