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Glossary

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ASP
Apple System Profiler
DC/DC
Also commonly referred to as the VRM, or Voltage Regulator Module. It is the long, narrow board that sits in the Cube at the top edge of the graphics card. It converts the 28V DC from the PSU to 12V, 5V and 3.3V for the various components of the Cube.
MOSFET
Pronounced MAWS-feht. Acronym for metal-oxide semiconductor field-effect transistor, a common type of transistor in which charge carriers, such as electrons, flow along channels. The width of the channel, which determines how well the device conducts, is controlled by an electrode called the gate, separated from channel by a thin layer of oxide insulation. The insulation keeps current from flowing between the gate and channel.

MOSFETs are useful for high-speed switching applications and also on integrated circuits in computers.

More details: http://en.wikipedia.org/wiki/MOSFET

PSU
Power Supply Unit. The white external power supply brick.
VRM
Voltage Regulator Module, also commonly
referred to as the Cubes DC/DC
(or DCDC) card. Its the long, narrow
board that sits in the Cube at the top
edge of the graphics card. It converts
the 28V DC from the PSU to 12V, 5V and
3.3V for the various components of the Cube.