once upon time a go two smart man were drinking a beer at theirs local bar  (Larry Page and Sergei Brin ) , they did have a debate about something , and they needed some answer about it . So GOOGLE was created , to find every answer there . and if you go www.goog.com and type  "7 gpu mining rig" you will have plenty of information, even some have successfully buid 8 gpu mining rig , with spliters or m.2 to pcie etc , you dont have to be that smart like them , you just have to fellow theirs build . THATS ALL  , [END OF SARCASM - in case you didnt realize]