HP xw9400 Service And Technical Reference Manual page 19

NOTE
using slot 3, which is the PCI slot below the graphics slot. If a graphics card requiring more than
75W is installed in slot 5, HP recommends not using slot 6, which is the PCI-X 100 slot below the
graphics slot. In addition to these slot power specifications, the overall power consumption of the
system (including I/O cards, processors, memory, and drives) must not exceed the maximum
ratings of the system power supply. Also, there are broad restrictions on using dual 150W
graphics cards.
For hardware specifications of other system components, such as graphics cards or optical drives, see
the website of the specific manufacturer.
ENWW
If a graphics card requiring more than 75W is installed in Slot 2, HP recommends not
Product specifications 11