Again I highly recommend to add a fan for the backside, even if you use a Nothbridge heatsink with active cooling. You have to realize a serious arifolw backwards , not only for the mosfets, the cap and the choke generates a lot of heat , too. And not to forget the power terminal , i still use the default ones , but i replace them two times so far, even if i have a backfan , the plastic isolation in the plug simply melt after a while. So its much, much better to use screw terminals or to solder the powerstripes direcltly on pcb.
The guys from gridseed seems just to finsh the device , but only with time and money aspect , the quality was not so important for them it seems. We can see that they use absolutley the same power plug as they use for the 5 Chip smaller gridseed, but the power consumption is nearly 2.5 - 3 times greater , if you consider that they calculate the BTC SHA-256 part for the smaller one.And the 5 Chip has a much better cooling because the original fan airfow catch the power plug too.
I think i have to replace the terminals too.This power plugs are maybe good for a IP Cam or something with low power but not for this high temps.
This is what i did (i use Arctic Silent F9 with temp sensor in front and back , they don´t have the same airflow like the original one, but with 2 of them it works good and really silent):
http://i60.tinypic.com/o73o09.jpghttp://i58.tinypic.com/ixd191.jpghttp://i60.tinypic.com/2ilmzbk.jpghttp://i60.tinypic.com/2ug01nk.jpg
