Unfortunately this B8 is the only S7 I have around. Just haven't been swayed by their pricing but the B8 finally dropped to where curiosity got the better of me.

I definitely will measure at 12.5V and I'd love to get data logging setup -- just need to put hands on a gpib-usb. I've observed a few funny lower current transients with lower hashrate but no ASICs x'd out and I'd like to capture that happening in a log.

The xitron box will even transfer i.e. voltage/current waveforms sampled at 18bits/500kHz, with fsample derived from any fundamental present (allows use of rectangular windows during DSP yada yada...); just waiting for DC shunt now to be able to do direct PSU / miner system efficiency measurement (simultaneous, synchronized, high-frequency capture of V and I on AC line and on 12V line). I've had this box around for a while but I'm glad I finally got it calibrated and setup!