Somehow I don't get any emails when replies are made here in the forum, so I'm only getting back to this now. So at the moment the optimal cooling option for the gamma is the Low Profile plus with a Noctua A6x15 fan – you can find details here:
https://plebbase.com/research/king-dead-long-live-king-low-profile-plus-bitaxe-gamma-63
cyan did a ton of research it looks good.
PS: cyan is not the author of the blog and the tests, that must be me by mistake
