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Alpenföhn Atlas might be the best cooler yet for SFF cases with a maximum cooler height in the 130mm range, like the M1 and Nova
Could you clarify what you mean by the "best"?
I read your comment in the M1 thread on [H] a few days ago in response to someone asking what the best air cooler for M1 would be, where you said you'd choose NH-U9S for components compatibility and ease of working inside the case but C14 or Dark Rock TF for the highest performance. Do you think that Atlas is "better" than those thick top-down coolers with a bigger than 120mm fan with six heatpipes inside M1 in the same sense, or this time in terms of cooling performance as well?
My intuition is 92mm fan tower coolers (Atlas, U9S, D9L, Macho90, etc) even with 5 or 6 U-shaped heatpipes, won't perform as well as C14/C14S/TC14CS/Dark Rock TF in a case where ventilation and component layout are designed to work to the advantage of the latter group (i.e., side panel vents, short distance between the fan and the side panel, and top vents) and to the disadvantage of the former group (i.e., there is no front intake/exhaust, and the front side of the cooler is partially or entirely blocked by the PSU placement) but this is just mere speculation.
ETA: I wish every product that comes out from Alpenfoehn also comes out from Deepcool and vice versa, as there is a distributor for Deepcool in my country but not for Alpenfoehn. I wanted to buy their Peter2.