ASROCK Z77 Extreme6 User Manual page 29

2.9 Thunderbolt
This motherboard has two thunderbolt connectors that support video output from
internal VGA cards. Due to 32-bit OS limitations, we strongly recommend using
a 64-bit OS to bring ThunderBolt into full play. For thunderbolt display installation
please follow the steps below:
Thunderbolt cables are provided by your monitor supplier.
Internal VGA
If you want to use the internal VGA with the Thunderbolt ports, simply connect your
monitor to either Thunderbolt port (see p.3, No. 12,13) on the motherboard using
a Thunderbolt cable.
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ASRock Z77 Extreme6/TB4 Motherboard