Asus E3746 - Manual (Page 183)

ROG Striker II Extreme / Striker II NSE 6-3
2. Insert the first graphics card into the PCIEX16�1 slot (blue), the second into
the PCIEX16_3 slot (white), and the third into the PCIEX16_2 slot (blue).
Make sure that the cards are properly seated on the slots.
3. Align and firmly insert the 3-way S��I bridge connector to the goldfingers on
each graphics card. Make sure that the connector is firmly in place.
3-way SLI bridge connector