There is a limited list of 10-bit DisplayPort compatible NVIDIA cards at Eizo at <http://www.eizo.com/global/support/compatibility/monitors/19.html> and ATI cards at Eizo at <http://www.eizo.com/global/support/compatibility/monitors/17.pdf>
Although neither list is complete (yet), we have several customers using a NVIDIA GeForce GT 120 card successfully with DisplayPort. Not sure why it isn't listed yet at Eizo.
Rick Hatmaker
CHROMiX.com