Interesting hack:
64*8 Zero 1.1's (now there are a few of them around) to process medical imaging data.
I did some tests on my two units "Alice" and "Bob" before Alice went AWOL, and it does seem that you can combine processing power very simply indeed with an external backplane and run the GPUs in tunnel mode by slight overclocking to exploit rowhammer effects in vulnerable areas of the memory
with temperature feedback via the existing sensor in the SoC.
The problem as it turned out was actually getting a decent number of them, had to resort to buying broken units on fleabay and repairing them with a very simple varicap clock modification so that the units can run synchronously by adjusting the brightness of one external LED attached to a photodiode sensor.
Way cheaper than the £39 (!) scalper price, also the Pi-0 can now control its own clock.
I tested this on quite a few recent laptops but the problem was that it ate the BIOS in short order for reasons that are still being investigated.
Biting the hand that feeds IT
