A preview is out on a Japanese website. LINK It can keep an E6300 (65W) cpu at 58C without a fan on an open testbed in case with some airlow it might be better, which is indicated by the fact that a store demos a rig with Phenom 9500 cooled by a fanless Orochi in Akihabara ( see bottom of the page).

This cooler wins in fanless mode so far which is going to be challenged by the orochi in a few days.

Bench of coolers in fanless mode. LINK

Can't wait to see which cooler is going to perform better in fanless mode as I delayed the purchase of a copper Ninja because of the orochi.

Thank you very much for this test Bluefront.
Couldn't decide whether to go for the Kama flow or the Noctua which costs twice as much this settled it.