Power Supplies: Form Factors

Form Factor of the PS describes the size and shape.

The FF must fit the case and fit in relation to the mobo.

PS FF names match those given to system cases.

Usual standard is ATX/NLX for 486-class and Pentium class PCs.

• Includes the +- 3.3 V output for AGP.
  
• First to include "soft power" switch that replaced the mechanical ones.
  
• Replaced the two-mobo power connectors with a single connector

SFX for Pentium Class: does not probifr -5 V output for older ISA expansion cards.
WTX for Pentium Class: ditto.