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Comparison of Power Supply Form Factors
This table is a summary comparison of the different power supply form factors. It shows their dimensions, the usual style of system in which they are used, and what sort of motherboard connectors they provide. It also shows for each power supply form factor, the typical cases and motherboards that are used with it. These lists should not be considered exhaustive. Also bear in mind that some combinations are much more common than others. "AT/ATX Combo" refers to cases designed to fit either AT or ATX power supplies, and motherboards designed with both AT and ATX style connectors.
Note: SFX and ATX power
supplies can generally be interchanged in systems sized to hold them because their 20-pin
main motherboard connectors are almost identical. They are not however
exactly identical: the SFX power supply does not provide the -5
V signal that may be required for some systems that use certain ISA bus expansion
* Standard configuration, not including additional top-mounted fan, if any. 50 mm height option also exists. See here for more details.