Coyn,

You might want to take a look at "Bits Be Trippin" YouTube channel https://www.youtube.com/BitsBeTrippin and there Website BitsBeTrippin.com

BBT Carter took 3 stabs at the B250 and concluded with VLOG #65 with 21 GPUs.  Videos are a little long but informative

VLOG #65-21+GPUs working in Windows
https://www.youtube.com/watch?v=miUoqnUqk9M

VLOG #64-16 GPUs working in Windows
https://www.youtube.com/watch?v=uPsgcKjBXCQ

VLOG #63-ASUS B250 Mining Expert
https://www.youtube.com/watch?v=h-ZEPjoFh2I

I hope this helps

  /s TuffToad