ASROCK PENRYN1600SLIX3-WIFI Installation Manual page 20

E. From the Display Properties dialog box, select the Settings tab then click
Advanced.
F. Select the NVIDIA GeForce tab.
G. Click the slider to display the following screen, then select the SLI
multi-GPU item.
H. Click the Enable SLI multi-GPU check box.
I. Click OK when done.
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ASRock Penryn1600SLIX3-WiFi Motherboard