well  one thing I do recall is like with the z68 boards  and 900 cards was  the evga cards  may not work out but MSI cards would  ?   could be just a bios handshake between the boards and cards bios  between brands  ?    sad thing is todays stuff just aint so plug and play anymore  ..  if you google around something like z68 and gtx 970  black screen or don't boot  , ect....  and read up on then type threads   anyway seemed MSI had given the better compatibility  of the top brands ..   evga the worse for cards and asrock and giga of motherboards ..[opinion of what I think I see form them]  some brands for there motherboards had released a new bios to better support new cards and some just left you holding the bag  [ Hi asrock ]    
 
seems since  the release of 900 series the forums fill up with issues  like never before     like that good old  ''LUCK OF THE DRAW''  is more important today then ever before