Antminer S1s with standard cp2102 usb to TTL serial connections, undervolted, underclocked:

where's the heatsink??? temps??
These have been undervolted and undercooked to the point that the boards act as their own heatsinks with a few fans to help.
Each blade is putting out 50 or so ghs. No idea on temps since this particular setup isn't capable of reading the temp sensor