Hardware Reference
In-Depth Information
Figure 18.7. EPS12V form factor power supply ( www.pcpower.com ).
This power supply is basically a 230mm-deep EPS12V supply that works in place of or as an
upgrade to an ATX12V supply as long as the chassis can accommodate the additional depth. EPS12V
supplies are sometimes called extended ATX power supplies because of their optional extended
length. If you plan to use one of these EPS12V power supplies in a standard ATX chassis, it's
important that you measure the available space in your chassis to ensure you have the room behind the
supply for the additional depth.
Connector compatibility isn't generally a problem because, by virtue of the Molex Mini-Fit Jr.
connector design, you can plug a 24-pin main power connector into a 20-pin socket, as well as an 8-
pin dual +12V connector into a 4-pin +12V socket.
If you have the room, an EPS12V power supply can be used with most ATX chassis and
motherboards for the ultimate in high-output capabilities.
TFX12V
The TFX12V (thin form factor) power supply was originally introduced by Intel in April 2002 and is
designed for small form factor (SFF) systems of about 9-15 liters in volume, primarily those using
low-profile SFF chassis and microATX, FlexATX, or Mini-ITX motherboards. The basic shape of
TFX12V is longer and narrower than the ATX- or SFX-based form factors, allowing it to more easily
fit into low-profile systems. The dimensions of the TFX12V form factor are shown in Figure 18.8 .
 
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