HP P/N 492329-004 DisplayPort to Dual Link DVI-D Adapter 2560x1600
Dell P/N A7102180 DisplayPort to Dual Link DVI-D Active Adapter (M/F)(Visiontek)
VisionTek P/N 900639 DisplayPort to Dual Link DVI-D Active Adapter (M/F)
Startech P/N DP2DVID2 DisplayPort to DVI Dual Link Active Adapter - DisplayPort to DVI-D Adapter Video Converter 2560x1600 60Hz - DP 1.2 to DVI Monitor - USB Powered - Latching DP Connector

or similar. 

Anyone have one of these sitting in a drawer and willing to part with it for a nominal sum? Trying to eek a bit more life out of an old 27" IPS.