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[ The PC Guide | Systems and Components Reference Guide | Power | The Power Supply | Power Supply Form Factors ]

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 cards.

Form Factor

Typical Dimensions
(W x D x H, mm)

Usual Style(s)

Motherboard Connectors

Match to Case Form Factor

Match to Motherboard
Form Factor

PC/XT

222 x 142 x 120

Desktop

AT Style

PC/XT

PC/XT

AT

213 x 150 x 150

Desktop or Tower

AT Style

AT

AT, Baby AT

Baby AT

165 x 150 x 150

Desktop or Tower

AT Style

Baby AT, AT, AT/ATX Combo

AT, Baby AT, AT/ATX Combo

LPX

150 x 140 x 86

Desktop

AT Style

LPX, some Baby AT, AT/ATX Combo

LPX, AT, Baby AT, AT/ATX Combo

ATX/NLX

150 x 140 x 86

Desktop or Tower

ATX Style

ATX, Mini-ATX, Extended ATX,  NLX, microATX, AT/ATX Combo

ATX, Mini-ATX, Extended ATX, NLX, microATX, FlexATX

SFX

100 x 125 x 63.5 *

Desktop or Tower

ATX Style

microATX, FlexATX, ATX, Mini-ATX, NLX

microATX, FlexATX, ATX, Mini-ATX, NLX

WTX

150 x 230 x 86 (single fan)
224 x 230 x 86 (double fan)

Tower

WTX Style

WTX

WTX

* Standard configuration, not including additional top-mounted fan, if any. 50 mm height option also exists. See here for more details.

Next: Power Supply Output and Ratings


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