Intel stated in this thread that they didn't have any plans for an Iris Pro variant of the NUC. I hope this isn't true, but I take what they said at face value.
I DO really like the idea of changing the cooling solution to use a bigger and slower spinning fan. It would make a big difference in how much noise these make.
jphorx. I have a DC3217IYE and I moved the MB from the Intel cabinet to a
Silverstone cabinet PT14.
That lowered the CPU temperature 10 degrees C. so now it is on par with my very noisy
D54250WYK. BIOS is set to Default in both cases.
With regard to noise: Wall mounted I can hear a weak 'chopping noise' from the PT14 fan and the airstream is not audible at all.
Placed on a table on a soft underlay it isn't audible at all.
The solution is thought out; you have an efficient active cooling fan at the bottom
of the cabinet (cooling the SSD, Wi-Fi card and RAM directly) and an efficient passive
cooling of the CPU and chipset on top. And the airstream from the fan passes of
course eventually through the passive grill.