DisplayPort to Dual Link DVI-D Active Adapter (CAC-1010), from Club 3D

This gadget allows you to seamlessly connect DisplayPort based sources to conventional DVI displays, such as CRT, LCD monitors and projectors.

Other than single-link DVI outputs with maximum resolution of 1920 × 1200 @ 60 Hz, the dual-link DVI of this adapter supports up to 2560 x 1600 pixels @ 50Hz or 2560 x 1440 @ 60Hz resolution, allowing you to take full advantage of large-format high-end displays, especially the 30-inch Apple Cinema Display. A USB-A port is included for powering to make sure the adapter will function properly.