ASROCK A75 Extreme6 Quick Installation Manual page 18

Step 2. Connect two Radeon graphics cards by installing CrossFire Bridge on
CrossFire Bridge Interconnects on the top of Radeon graphics cards.
(CrossFire Bridge is provided with the graphics card you purchase, not
bundled with this motherboard. Please refer to your graphics card vendor
for details.)
Step 3. Connect the DVI monitor cable to the DVI connector on the Radeon graph-
ics card on PCIE2 slot. (You may use the DVI to D-Sub adapter to convert
the DVI connector to D-Sub interface, and then connect the D-Sub monitor
cable to the DVI to D-Sub adapter.)
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CrossFire Bridge
or
ASRock A75 Extreme6 Motherboard