PCB changes were minor, so any PCB design version, if it works at all, should also work with the latest firmware (the one that I posted). I would NOT recommend building the 16-chip board for the reason of overloading the voltage converter. Or if you build it, mount 10-12 chips on it. With chips working in turbo mode, it's 2.5W per GH. At 1.6GH the power per chip is 4W which corresponds to 4A current draw per chip. So with 12 chips you'll get 48A which is just below the maximum rated load (50A) of the voltage converter module. This way your circuit should run safely. To have a little extra margin, 10 chips would be even better.