with firmware 0.9.5 I get a difference of ~45 Gh/s between closed and open case (~480 Gh/s vs. ~525 Gh/s).
going to try firmware 0.9.6 with closed case.
525 Gh/s closed or open case?
525 Gh/s open case with firmware 0.9.5
EDIT: in the meantime firmware 0.9.5 did reach 516.16 Gh/s with closed case. it seems to me it takes a while until it adjust to the max. level with closed case. my impression is with open case adjustment of max. level is faster.
buttom line after 2 hours or so of self adjustment of the miner with closed case I have no difference of hashrate between open and closed case. both ~525 Gh/s with firmware 0.9.5. but it will take definitely longer to get the end hashrate with closed case.