http://www.tomshardware.co.uk/geforc...-32475-14.html
That's at full load though. Most of the time they won't be quite that loud. I'm pretty sure the ASUS was the same price as the Gigabyte when I checked, but never mind.
The 3770k is fine for overclocking, you just can't push it as far as say, the 2700k. You probably won't get more than an extra 5-10% out of it with the stock cooler though.