On the HP ML110 G7 You have to edit the bios for it to work with Esxi5 or you will get a Pink screen of death, the changes needed are.
“Power Management Options” >> “Advanced Power Management Options” >> “Minimum Processor Idle Power State” >> “C6 State”
“Power Management Options” >> “Hp Power Regulator” >> “OS Control Mode”
To update Esxi 5.1 to support VGA Passthrough a patch is needed.
To apply the update, log into your Esxi Host, Press “F2″, go to “Troubleshoot” and enable “Shell” then press “Ctrl + Alt +F1″ , login with root and password and insert this command.
esxcli software vib update --depot=/vmfs/volumes/datastore1/ESXi510-201212001.zip
To upload the patch to Esxi you can use the vSphere client to upload files to your Datastore, You just need to go to “Configuration” >> “Storage” and right click your Datastore and select “Browse Datastore”