I am thinking about replacing my htpc with a Mac mini running windows, as was advised on avsforum. But they are not always as concerned with noise, so I thought I better ask here about how noisy the mini really is. Also if there is any gain from choosing specific mini models noise wise. It's going to replace a c2d 8400, with nexus fans in a ahanix case.

This might help. Get the baseline unit. Maybe boot from an external SSD.

By baseline, do you mean the version with the lowest configuration?
Thx, I just saw the post. Very informative indeed.

I am just in doubt if there is a difference between the 2011 and 2012 models in terms of noise. I am also considering to await the next generation, based on the haswell platform. Intel will release the platform in 2Q 2013, but there is no rumors about when a mac mini based on this will hit the shelves. However, as I am in no hurry as my existing htpc is working okay, I can wait and see.

baseline = cheapest version.

Haven't listened to the 2011, so couldn't compare. All in all, the 2012 is pretty quiet, especially if it's sitting next to a TV 6ft or more away.

If Intel's Haswell intro schedule is similar to IVB, and Apple's Mac intro's follow the same gameplan this year as last, you won't see 2013 Mac Mini's until November. That said, Haswell's IGP should kick some butt.