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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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