Just got my batch 2 Mini yesterday. Ran it at 650 Mhz all night and had no HW errors and minimal pool rejects (using nanopool). Getting around 14.8Ksol/s. What's odd is I changed the cgminer.conf to set the speed to something higher but anything higher than 650 just gives me a really low hash rate, around 4.5Ksol/s, even 655 Mhz. No HW errors, just slow hashing. Anyone else experience this?
4.5 means two of the boards dropped out, hence you get a third of the hash rate.