The VHDCI to 4x DVI-D Cable for Quadro NVS 420 from PNY Technologies can be used to connect up to 4 DVI-D displays to their Quadro NVS 420 display card. Each display can be up to 1920 x 1200 in resolution.
The cable is also compatible with other display cards by PNY that use a VHDCI connector for signal output.