yeah thx for your advice, i jumped straig to the b250...everything running smooth and stable now with 8 gpu...more gpu´s will follow 
i´ll keep the 81btc for a small riger
i´ll keep the 81btc for a small rigerhi, can you explain how you get working 7 gpu on asrock h81 r2.0. i can get it done.
as soon as i add 7 gpu, it gets me boot loop and wont boot. have to clear cmos to manege to restore its functionality.
tried 2 in 1 extender and 4in 1 extender... no luck so far.
i have nvidia cards 1070 available.. no AMD.