Re: Thermals
I'm happy with my Bulgarian Olimex boards, no USB3 yet, but gig-ethernet whilst cool & silent running.
I used the SATA interface for rotary HDD without problems, stuck a LiPo on as nano-UPS. can run Android or Debian. [Cortex-A7, DualCore, 1GHz, DDR3 1GB, 4GB NAND] ~75$/€/£
https://www.olimex.com/Products/SOM/A20/A20-SOM-EVB/open-source-hardware
https://www.olimex.com/forum/index.php?board=30.0