Hardware Reference
In-Depth Information
Table 18.3 Obsolete Industry Standard Power Supply Form Factors
You may encounter power supplies using obsolete form factors if you work on PCs built
in the 1980s through the mid-1990s. I cover them in more detail in the 18th and earlier
editions of this topic.
Each of these power supply form factors is, or has been, available in numerous configura-
tionsandpoweroutputlevels.TheobsoleteLPXformfactorsupplyoriginatedintheIBM
PS/2 Model 30 in April 1987 and was the standard used on most systems from the late
1980s to mid-1996, when the ATX form factor started to gain in popularity. Since then,
ATX and the many variants based on ATX have become by far the dominant form factors
for power supplies. It is interesting to note that IBM's legacy lives on even now because
ATX,PS3,andEPSareallbasedontheLPX(PS/2)physicalformfactor.Anypowersup-
ply that does not conform to one of these standards is considered proprietary . In general,
avoid systems that use proprietary power supply designs because replacements are diffi-
 
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