ASROCK 990FX Extreme9 Manual Del Usuario página 24

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 PCIE1 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.)
2.6.1.2 Installing Three CrossFireX
Step 1. Install the identical 3-Way CrossFireX
AMD certified because different types of graphics cards will not work to-
gether properly. (Even the GPU chips version shall be the same.) Insert
one graphics card into PCIE1 slot, another graphics card to PCIE4 slot,
and the other graphics card to PCIE5 slot. Make sure that the cards are
properly seated on the slots.
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CrossFire Bridge
ASRock 990FX Extreme9 Motherboard
or
TM
-Ready Graphics Cards
TM
-ready graphics cards that are