I have been playing with all different clock levels and Hash Board #3 is consistently between 5 to 10 degrees hotter than the rest.. I assume it's because the chips and heat sinks are on the outside and lacking air flow. Suppose I open the thing, and reverse the hash board.. I can dremel some new holes if necessary... I have 700mhz running stable now cause I am in winter in Canada and my mining room is only 10C right now LOL.... temps are 74,64,82 So obviously airflow to outside boards are the problem, and I would assume board 3 was designed the wrong way fir air LOL just thoughts.. Also only running 57 ASICS on board 3 cause earlier problems... I like to live dangerously