Hi mate
You could try the settings suggested by Rubini here using nHancer;
http://www.subsim.com/radioroom/showthread.php?t=128517
However this will require an old driver as nHancer stopped support anything much after the 185.xxxx series drivers IIRC. You could try nvidia inspector, as this supports even the latest drivers. I have a couple of inspector profiles I can post if you want to try that route
Best regards.
Fubar2Niner