Is your custom fan curve working for you all the time and staying active when Afterburner switches between 2D and 3D profiles? No matter what, with Unofficial Overclocking enabled, my fan curve goes back to ATIs default when the profiles automatically switch. Even though, in Afterburner, User Define is selected and the fan slider boarder is lit up green to show that its supposed to use my custom curve. Two click of the "user define" button and my fan curve reactivates, but only until I change the clocks or the profile switches. What about you? Are you sure AB is following your custom fan curve all the time? I don't see why yours would when mine wont.
I see what you are saying...
The custom fan is staying active and accurate most of the time...but, for instance, I just adjusted profile 5 900/1375 to 910/1375@1.18 in 3DMark 11. It ran fine to completion. Then when I went to save that profile to spot 5, the fan dropped back down to like 27%. It stayed there for a few seconds, maybe ~5sec, then went back up to where it was supposed to be, ~35%.
After that, I switched back to 1, which is 400/625@0.9v. When I did, the fan dropped to 27%, stayed there for about 3-4secs, then went back to 30 where it's supposed to be.
Sometimes though, when I switch profiles (1-5), I don't have to click twice, sometimes it takes a few seconds to get the fan curve back to where it was. I would say it's buggy or somewhat.
I think you're right, it just takes a bit to get back on track, not sure why.