I’m using dell’s 6430u for a few months now and went through 4 bios updates, but the excessive fan noise issue is still present even with release A05.

The dell tool (system utility application) suggested in a support thread didn’t helped either.

Dell has now publicly acknowledged that there was a manufacturing issue with the fan of the 6430u: the next time that I’ll be not traveling for a while I’ll open a call to get the fan fixed/replaced: fingers crossed.