> kaip ir rašiau pagal prioritetus - pirmas prioritetas - tylus, todėl
> kaip suprantu Core M su pasyviu aušinimu tinkamiausi šiuo aspektu?

teoriskai taip, tik Core M ar pasyvus reiktu dar pasitikslinti.

The incorporated Core M processor makes passive
cooling of the notebook possible.

t.y. "possible" tai dar nereiskia, kad pasyvaus jam per akis.


Power Consumption
Thank to its Core M processor, the Zenbook is very frugal when idle. We 
measured a power consumption of 6.5 W. It is not surprising, that the 
power consumption only increases to 15.5 W during the stress test since 
the CPU and GPU are heavily throttled. The Zenbook UX305FA-FB003H with 
the same CPU reached double the power consumption under full load. 
However, this is only true for the first seconds of the stress tests. 
Afterwards, the sibling also throttles and the power consumption falls.

beje,
http://www.notebookcheck.net/Asus-Zenbook-UX305-Subnotebook-Review.136543.0.html

Heat pipe and cooling ribs - but no fan.
http://www.notebookcheck.net/fileadmin/Notebooks/Asus/ZenBook_UX305/Asus_UX305_42.jpg