This is a Nvidia Quadro4 NVS 400. It has two LFH 60-pin connectors on it providing DVI plugs for up to 4 monitors at once. Only comes in PCI (be nice if there was a PCI-Express version).
It presents itself as two separate PCI devices and will only work with the 'nvidia' X driver from NVidia. Xorg config is just like any other multi-head card. See the NvidiaDriverHowto page.