I replaced the stock fans on them with ones from cooler-master that have twice the airflow rating (
https://amzn.to/2xvCzZh) [and 50mm M3 screws] and that's got them in line.
The 550 PSU is now powering all 6 at 200mhz and putting out a combined 536 GH/s which is right in line (slightly better) than the predicted output.
http://biggerdiapers.com/gek.jpgSo, you replaced the fans that come with R808 then added additional fans? Which direction do the fans blow?
I guess I lucked out because the power brick and delivered fans are able to get me to 200Mhz just fine... getting around 80Gh-85Gh.
