I'm having issues enabling overclocking and getting manual control over the fanspeeds of my Nvidia GTX 570 in Precise.

I've modified my xorg.conf to enable coolbits but the options don't appear in nvidia-settings. Here's my conf:

Section "Device"
    Identifier    "Device0"
    Driver         "nvidia"
    VendorName    "NVIDIA Corporation"
    Option    "NoLogo"    "True"
    Option   "Coolbits" "1"

Section "Screen"
    Identifier "Default Screen"
    Monitor "Configured Monitor"
    Device "Device0"
    DefaultDepth 24
    Option "Coolbits" "1"
So I'm wondering if there have been any changes to how Xorg configuration is read in 12.04, if I'm simply editing a file that has no effect. Or if there are any other known issues.