Room 1 - theres 14 x 2 x 7970s 
, just dont have a wide angle lens to get the whole room. Will post Room 2 and 3 later
, just dont have a wide angle lens to get the whole room. Will post Room 2 and 3 later Does each board need it's own bootup drive/OS?
How are they are managed?
No it doesnt. I have them simply because it was easier for me, and I also run some other software that need win 7 64bit. Mostly people run linux from a flash drive, or you can also boot over network