Hardware Reference
In-Depth Information
TFX12V power supplies are designed to deliver nominal power output capabilities of
180-300watts,whichismorethanadequateforthesmallersystemsforwhichtheyarede-
signed. TFX12V supplies include a side-mounted internal 80mm fan that is usually ther-
mostatically controlled, so as to run both coolly and quietly. A symmetrically designed
mounting system allows the fan to be oriented facing either side inside the system for
optimum cooling and flexibility in accommodating different chassis layouts (see Figure
18.9 ) .
Figure 18.9 TFX12V power supplies are symmetrical and can be mounted with the fan facing either left or
right.
Unlike SFX-based supplies, only one standard mechanical form factor exists for TFX12V
supplies. TFX12Vsupplies havealsoalways included the4-pin+12Vconnector since the
standardappearedinApril2002,wellafterthe+12Vconnectorhadbeenincludedinother
power supply form factors. TFX12V 1.2 (April 2003) added the Serial ATA power con-
nector as an option, whereas the TFX12V 2.0 release (February 2004) made them man-
datory and changed the main power connector from 20 pins to 24 pins. Revision 2.1 (July
2005) includes only minor updates and changes from the previous version.
CFX12V
The CFX12V (compact form factor) power supply was originally introduced by Intel in
November 2003 and is designed for mid-sized balanced technology extended (BTX) sys-
tems of about 10-15 liters in volume, primarily using microBTX or picoBTX mother-
boards.
CFX12V power supplies are designed to deliver nominal power output capabilities of
220-300 watts, which is more than adequate for the mid-sized systems for which they are
designed. CFX12V supplies include a rear-mounted internal 80mm fan that is typically
thermostatically controlled, which enables it to run both coolly and quietly. The shape of
the supply includes a ledge such that part of the supply can extend over the motherboard,
 
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