Re: S7 controller has nine 18- pin jacks So what can we do with it?
I just hooked two units together via the rails and then unmounted both control boards and place a single bb board and data port board in between the two miners held in place with a little velcro. The original cables the S7 ships with are plenty long enough when set up this way... 
[img=http://s27.postimg.org/z2bmhxs3z/IMG_0128.jpg]
[img=http://s27.postimg.org/3u31km2dr/IMG_0120.jpg]
point them upwards top to top that allows for vertical and hot air raises.
stack them on a box fan which allows for more air to help fans. also if fans fail the box fan may save the day.
[img=http://s27.postimg.org/z2bmhxs3z/IMG_0128.jpg]
[img=http://s27.postimg.org/3u31km2dr/IMG_0120.jpg]
It would seem to me you could lash together two S7's with a single controller if you were to lay the miners on their sides, so that the "Top Side" were facing each other. Kind of awkward to wire up, but it shouldn't take any "long cables" to accomplish.
It would be interesting to know if the S7 cooling actually requires that the blades be vertical to work OK. While it's obvious what the "expected" orientation is, does it still behave well if it's laid on it's side?
It would be interesting to know if the S7 cooling actually requires that the blades be vertical to work OK. While it's obvious what the "expected" orientation is, does it still behave well if it's laid on it's side?
point them upwards top to top that allows for vertical and hot air raises.
stack them on a box fan which allows for more air to help fans. also if fans fail the box fan may save the day.
thats what i did, works great.
thx for sharing the info guys but i noticed they do run slower than individual controller
how much slower? 4800 + 4800 = 9600
are you dropping to 9500 or 9400 or worse?
I theorize the controller is running 4 fans vs 2 so that the pcie runs volts say 12.0 vs 12.1 and thus lower speeds.
I also think 2 s-7s on two controllers give two sets of psu readings so if one psu is 12.1 and the other is 12.0 one s-7 will run better.
but 1 controller uses the lower reading so it reads the 12 and both s-7s run lower.
voltage is minimum of 12.2V & i might up it soon (12.5V) after modding psu's.
i can run 3 s7's with 2 x 2000bb psu but i'm running 1 x 2000cc per s7 so power is not the issue.
i think finsky might be right about connection between chips & controller ?
after i've modded psu voltage to 12.5V or more i will try again & see how it goes.
tests will be at stock speeds. 12.5V & 12.8V will be tested & see if there's any difference.
lucky for us, no need the long cables like the s5's to merge 2 in 1.
more ideas & suggestions, results are welcomed.