Hardware Reference
In-Depth Information
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.
TFX12V supplies have also always included the 4-pin +12V connector since the standard appeared
in April 2002, well after the +12V connector had been included in other power supply form factors.
TFX12V 1.2 (April 2003) added the Serial ATA power connector as an option, whereas the TFX12V
2.0 release (February 2004) made them mandatory 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) systems of about 10-15
liters in volume, primarily using microBTX or picoBTX motherboards.
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, reducing the overall size of the system (see Figure 18.10 ) .
The dimensions of the CFX12V form factor are shown in Figure 18.11 .
 
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