The ASUS Thunderbolt EX is a swanky PCI-Express 2.0 x4 add-on card, which is driven by an Intel "Cactus Ridge 2C" Thunderbolt host controller. The TB_HEADER is a low-level connection between the motherboard and the add-on card, which transacts power state, signaling, and device hot-plugging events to the system BIOS. Some of ASUS' recent 7-series LGA1155 motherboards can be retrofitted with Thunderbolt the same way, and feature the same header. The card has a nice EMI shield running the entire length of its PCB. Its rear panel has one full-size DisplayPort, which is actually an input from your graphics card, and one Thunderbolt + mini-DP output.
Source: VR-Zone]]>
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