Re: default fan speed at 100% on 9600GT
But when you let it use this register it works fine for you? The problem is that basically all cards use the register inverted mode (actually all other pwm registers on nvidia are used inverted) likely because the output is fed through an inverter to amplify the current. The lack of the inverted/non-inverted detection is the reason the code isn't in as I have seen both cases and likely I said in general it is inverted.
Could you check the pci vendor and device id of your card? (nvclock -D output contains it)