KVM and PCI passthrough with K2000D and K5000D

I get the following errors when attempting to pass through a K2000D to a RedHat VM using RH6 and KVM.
Xorg.log - (EE) NVIDIA GPU@PCI:0:8:0 is not supported by the 346.72
dmesg - rminit_adapter failed Nvidia_frontend_open; minor 0 module->open() failed, error -5

pci passthough works fine with a K5000D and driver.
Is this disabled for K2000D? I can’t find any clear indication of support one way or another for pci passthough w/ 2000D.