Putty is pretty good, and you don't need special thickness thermal pads.
I hate auto fan adjustments, so I always set ~30-40%. ~40% is usually very quiet for all modern fans. Auto is typically up to 60-70%, so for most popular fans it's 2000-2500 RPM. Some series have really bad curves, and then fans go to 100%. I had that in the Gigabyte 7900GRE, which was passing 3000RPM on all three fans.
I hate auto fan adjustments, so I always set ~30-40%. ~40% is usually very quiet for all modern fans. Auto is typically up to 60-70%, so for most popular fans it's 2000-2500 RPM. Some series have really bad curves, and then fans go to 100%. I had that in the Gigabyte 7900GRE, which was passing 3000RPM on all three fans.