HP Z400 - Workstation Maintenance And Service Manual page 207

CPU power cable, P3
CAUTION: Ensure that you can differentiate between which power cable
connects to the PCIe x16 graphics card and which power cable connects to the
system board. These two cables have different pin counts and different colors.
The PCIe power cable has a 6-pin black connector, and the CPU power cable has
an 4-pin white connector. When power is present, you must never connect the
PCIe power cable to the system board. If you do so, the system board can be
damaged and the warranty voided. To see a picture of the PCIe cable and where
it must be connected, see
NOTE: The 6-pin power (auxiliary PCIe) is only required with high-powered
graphics cards.
Graphics aux. power cables, P12
4 6
1
3
Internal USB 1 2x5
ENWW
Pin
1
2
3
4
Expansion cardon page 104.
Pin Signal
1 V12-D
2 V12-D
3 V12-D
4 GND
5 GND
6 GND
Pin
1
2
3
4
Color Signal
BLK GND
BLK GND
WHT 12V CPU
WHT 12V CPU
Color
YEL
YEL
YEL
BLK
BLK
BLK
Signal
+5V
+5V
USB6#
USB9#
195