I made a modded ROM for my Nanos.
1050 Mhz / 300 RAM results in 30.8 Mhash with Ethereum.

Power Consumption is around 175 when i remember well.

VCore starts with 1.125V, while Mining 1.1V

Cooling with Raijintek Morpheus 2 and 2 Arctic F 12 120mm -> 39 Degrees.

If interested, i can post a Pic of the Nanos. Mounting the Raijintek Morpheus is not without problems, but
i think i got a solution.