Bi11hi11y :
I want to build a mini itx system with a GTX 1070 in it. Will it overheat? If not, how hot can I expect it to run? Thanks!
://au.pcpartpicker.com/user/Bi11hi11y/saved/VFWXLk
No if you create a proper airflow, but in your case you are choosing a sound dampering case, usually they are not the best options for cooling and the default fans for the case (one front after a closed cover and one aft) are not the best. i would change the front fan to a botton fan and add one or two upper fans.
Btw i would also switch the Sata SSD for a M.2 SSD.
You could expect more or less 35-40º over ambient for the GPU and the CPU on full load.