ATI Technologies X1900 - Radeon XTX 512 MB PCIE Video Card User Manual page 110

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Note: To determine which PCIe™ slot is the primary slot, consult
your motherboard manual.
Alternately, to determine whether or not a CrossFire™ Edition card is
in the correct slot, connect your display directly to the DVI-I
connection on the Master graphics card instead of using the
CrossFire™ connector, with both graphics cards seated in their
respective slots on the motherboard. If an image appears on the screen
upon boot-up, the card has been placed in the correct slot on the
motherboard.
6
Are there any software settings required for CrossFire™ to
work?
Yes, there is a setting in the Catalyst™ Control Center that needs to
be enabled for CrossFire™ to operate. When all of the hardware and
software has been properly set up and installed, the following
CrossFire™ aspect appears in Catalyst™ Control Center: