Awesome. Glad to hear it.
Depends on your motherboard. You can check their website for that specific model.
If it doesn't, however, you'll need to go into the BIOS and adjust the fan curve there. One of my PCs doesn't allow me to lower the fan from 100% during operation above 70C. I find this incredibly annoying on that computer because CPUs on air spike all the time, so I just keep the curve more consistent at a sacrifice of constant fan noise. I'd rather more whirling sound all the time then it randomly oscillating.
Noise is one of the main reasons I water-cool my system. As long as any reasonable amount of air is going through the radiator, the fans don't need to ramp up like crazy. They can stay at a constant medium speed, low-noise setting.