Wouldn't building a new rig with another mobo be actually cheaper?
Also would Windows tolerate more than 6 GPUs? I guess with linux you would't have this problem.
Not if you factor in the fact that you have 6 cards per system max, say $400 per system minimum, thats bottom of the barrel stuff, so for 16 gpu's you would need 3 systems
So that's $1200
Yes buying one of those is more expensive in this case, coming to around: $1600
but if you go over that, the people its aimed for you get this
32 gpu's - 6 systems - $2400
32 gpu's - 1 system - $2600
Then factory in space savings as you wont have 5 extra MB's around. It would work out at a saving but not without high card amounts