Can you post the output from /var/log/vmkernel.log
It should look something like this:
2012-01-10T20:56:37.502Z cpu1:3977)PCI: driver nvidia is looking for devices
2012-01-10T20:56:37.515Z cpu1:3977)PCI: driver nvidia claimed device 0000:80:00.0
2012-01-10T20:56:37.515Z cpu1:3977)PCI: driver nvidia claimed 1 device NVRM: loading NVIDIA UNIX x86_64 Kernel Module 295.09 Thu Dec 22 01:11:29 PST 2011
2012-01-10T20:56:37.516Z cpu1:3977)Mod: LoadDone:4465: Initialization of nvidia succeeded
2012-01-10T20:56:37.516Z cpu1:3977)nvidia loaded successfully.
// Linjo