Running 10 ML2 @ 744 Mhz on Sipolar A400. I removed stock fans. Too noisy and doesn't work with Sipolar A400 narrow profile required for 10. Had an Arctic USB Fan blowing on them on the side. Ran into random ASIC stop hashing (likely due to overheating). jstefanop's driver update brought them back to life but still random ASIC stopped hashing. Anyway, bought a bigger $4 USB fan from Daiso. That actually moves more air and keeps the "stopped hashing" error message away. So, I believe the Arctic fan was inadequate and the ML2 were overheating.

Daiso Fan here: https://i.imgur.com/GsVRLs1.jpg