StarTech.com 1ft DVI Splitter Cable - M / F - DVI-D to 2x DVI-D Dual Video Split
DVI SPLITTER FOR MIRRORED DISPLAYS: View two identical DVI-Digital (24-pin) images from a single DVI-Digital (24-pin) source with this 1ft (30cm) DVI-D to 2x DVI-D (DVI-Digital) splitter; DVI-Analog signal is not supported.