when most people calculate fan performance, noise is part of that calculation.
if your case has 48mm cooler clearance, and a 1mm airgap, it will be extremely noisy.
so my measurements include the correct airgap.
if you're using a SkyReach case, to get near-identical performance with a BlackRidge, your sidepanels need to be raised about 3mm.
if you're using a SkyReach case, to get near-identical performance with a CryOrig C7 graphene, your sidepanels need to be raised about 7mm.
see youtube video, timestamp at 1:08:19 ,where a Noctua fan is used to replace its original fan :