If you remember, we posted a story sometime ago about this add on card. This card will fit on a number of ASUS Z77 models that has the TB header on it e.g. ASUS SABERTOOTH Z77. (News link)
This card is a dual protocol with PCI Express and DisplayPort. It supports 10 Gbps per channel in both directions.
The card has two connectors, one is for the Thunderbolt connector and the other is the DisplayPort IN port.
This solution is kind of hybrid as you would need to connect the existing DisplayPort with the card with the cable provided. The card can support a daisy chain of up to 6 Thunderbolt devices.
Here are some pictures of the package and product.