ATX, WTX and other standard and proprietary power supply (PSU) cables connectors pinouts
standard interface between BTX motherboard and compatible power supply
1+3.3 VDC 
2+3.3 VDC 
4+5 VDC 
6+5 VDC 
8PWR_OKPower good - indicate that VDC voltages are in range.
9+5 VSBStandby voltage
10+12 VDC 
11+12 VDC 
12+3.3 VDC 
13+3.3 VDC 
14-12 VDC 
16PS_ON#Active low. TTL compatible (0.1-0.8V low; 2.0 high?). When low - DC outputs are enabled. When high - power supply should not deliver DC current.
21+5 VDC 
22+5 VDC 
23+5 VDC 
24 pin MiniFit Jr 5566-24 male (MOLEX 44206-0007) connector layout
24 pin MiniFit Jr 5566-24 male (MOLEX 44206-0007) connector
at the motherboard
24 pin MiniFit Jr 5557-24 female (MOLEX 39-01-2240) connector layout
24 pin MiniFit Jr 5557-24 female (MOLEX 39-01-2240) connector
at the power supply cable
According to 4 reports in our database (4 positive and 0 negative) this pinout should be correct.

Is this pinout
BTX motherboard power supply visual pinout:
BTX motherboard power supply diagram
click to enlarge
Source(s) of this and additional information: BTX interface specification at the
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