Hardware Reference
In-Depth Information
All LFX12V supplies include a 24-pin main motherboard power connector, a 4-pin +12V
connector, and Serial ATA connectors. The current LFX12V 1.1 release dates from April
2005 and has only minor revisions over the previous version.
Flex ATX
A power supply company called FSP (Fortron Source Power) originally introduced vari-
ations of what was to become the Flex ATX power supply form factor in 2001 in the
form of proprietary designs for SFF desktop and thin (1U) server systems. These power
supplies became popular in systems from Shuttle, but they have also been used by HP/
Compaq, IBM, SuperMicro, and others. In an effort to make this form factor an official
standard, Intel introduced the Flex ATX power supply form factor in March 2007 as part
of the 1.1 and later revisions of the “Power Supply Design Guide for Desktop Platform
Form Factors” document, which is available on the
www.formfactors.org
site. These are
also sometimes called 1U (one unit) power supplies because they are used in many 1U
server chassis.
Flex ATX power supplies, like the one shown in
Figure 18.14
,
are designed to deliver
nominal power output capabilities of between 180 and 270 watts, which is ideal for the
small systems for which they are designed. Flex ATX supplies usually include one or two
internal 40mm fans; however, larger fans can be mounted horizontally, and even fanless
models exist. The dimensions of the Flex ATX form factor are shown in
Figure 18.15
.
Figure 18.14
Flex ATX power supply.
Figure 18.15
Flex ATX power supply dimensions.
