Unfortunately, the Thunderbolt card we make only works as a target device. While it has a PCIe card edge connection it is a slightly custom pin-out and the device on the card is set in downstream mode. The Thunderbolt spec makes it difficult and costly to make a Thunderbolt certified host card. Many parameters of Thunderbolt are tied directly to motherboard resources that are not part of the PCIe slot. These include the requirement for Thunderbolt to support Display Port video and hot-swap of the cable through BIOS. At the minimum a Thunderbolt host interface would have to have a GPU, memory and a driver to support all of the Thunderbolt features built into motherboards. These additions to a host card would make it more expensive and over complicated for the functions most people require, which is a PCIe host interface using the Thunderbolt cable. Any host card that did not include the video and hot-swap could not be labeled as Thunderbolt compatible and violate our Thunderbolt agreements with Intel and Apple.
As an alternative, we have PCIe interfaces from 5-128Gbps that operate in any PCIe slot of a PC or Mac and externally cable to the same range of PCIe expansion systems such as our CUBE or Accelerator product lines.