glossary category

Electronically commutated motor

Equipment cooling class

The most commonly used type of memory in computers. A bank of DRAM memory usually forms the computer's main memory. It is called dynamic because it needs to be refreshed periodically to retain the data stored within

A small circuit board that usually holds memory chips. A single in-line memory module (SIMM) has card edge connections that are connected to the same signals on both sides of the PCB, whereas a DIMM has different signals on each side of the PCB

A well in a piping system that allows a thermometer or other device to be inserted without direct contact with the liquid medium being measured

See temperature, dry-bulb

A period of time during which a system is not operational due to a malfunction or maintenance

Refers to a type of air conditioning system that discharges air downward directly beneath a raised floor commonly found in computer rooms and modern office spaces

A level of floating point accuracy that usually requires twice the space for each value than does single precision, but provides considerably more precision. For most systems running the SPEC CPU tests from the OSG (e.g. CPU2000), double precision implies a 64-bit value

An advanced version of synchronous DRAM (SDRAM) memory now used in most servers. DDR-SDRAM, sometimes called SDRAM II, can transfer data twice as fast as regular SDRAM because it can send and receive signals twice per clock cycle