TweakTown uses a different method for testing CPU heatsinks which allows for an even playing field across all product tests. We feel that by using the same ambient temperature and strict lab-like testing procedures we are able to accurately compare one product to another. More information on our testing procedure can be found in the T.E.C.C. article here.
The temperature testing is where the big surprise is. The Nano performed just a little bit better than the Micro even though it is smaller. The bad thing is that they both performed poorly when used on our flagship processor simulator, but both the Nano and Micro were never built to take on such a powerhouse.
In the acoustic footprint test, I found that the Nano was a quieter cooler than its larger brother was. This was not a big surprise as most 10mm tall 80mm coolers tend to be very quiet. The Nano is a much quieter cooler than the stock Intel heatsink and will do very well in HTPC applications when low wattage processors are used.