If you have issues with heat emission from the H-boards V1, you should try to cool the back of the PCB. If you put a heatsink on top the bitfury chip it won't do very much, it only helps a little. Most heat generated by the bitfury chip comes from the bottom of the chip -> back of the PCB. Try to fit a heatsink on the back of PCB but I know there is little space for that.
We designed a new version of the M + H board concept and made little holes in the PCB where the Bitfury (rev2) chips are mounted, so we have better heat emission. unfortunatley you can't make those holes in the PCB afterwards..
An other option is to undervolt the boards, if you lower the input voltage to 11.8, 11.7, 11.5 or maybe even 11V the boards should still work, the hashrate will be at a lower rate but it won't get as hot as on 12V and this way the total hashrate might not be optimal but higher than de 200GHs I guess. Just try it out.
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Don't know exactly, a 1000W or more....
