BTCGarden AM/V1 or V2's both require a Pi + Power Supply... BTCGarden released a new image and you can use B+'s as the controller, so even lower energy usage.. When you receive your new BTCGarden disable the NTPdaemon... My stats were erratic due to shorts bursts of inability to connect every 60 seconds or so.  Once I disabled it/change it to an oceanic pool it became an almost perfect straight line.

The BTCGarden's do have a higher usage but produce a LOT less heat and exhausting them is not that much of an issue at all/compared to Antminer S3/ASICMiner Tubes.