UPDATE: After speaking with our Noctua rep, this method is unacceptable as the heatsink has the possibility of falling off. If you move your PC around a lot (i.e. LANer), its more than likely that the cooler would fall off due to its weight and height. Their choice of mounting brackets is a sound one, and whilst it may reduce compatibility in some situations, it means that customers won't end up with a fried board.

Testing

As chipsets don’t have an integrated temperature diode, and simply taking the temperature of the heatsink only shows how much it conducts, I had to rely on maximum overclock possible.

Previously, 3.5GHZ (220 FSB from 200) with memory running in ratio with processor (DDR4000) would be slightly unstable and things would start to crash after using the computer for a while. The RAM couldn’t be the problem as it was running at DDR3200 speeds, the CPU was less than 35C permanently.

After installing the NH-U6 from the previous tiny passive heatsink, 3.6GHZ was possible; fully stable. Considering as this board is budget and aging, this is no mean feat.

Even after continuous play of Battlefield 2142 for a good few hours, not a single thing crashed and the temperature of the NC-U6 was warm to the touch, but far from hot.

That said, I do have a side case fan blowing directly onto the cooler. However, the NC-U6 itself is itself passive and noise-less which could be a viable upgrade for someone with a whiny 40mm fan on their chipset.