“Fitted easily and with good clearance under a HifiBerry Amp2 HAT. I've installed pi and HAT into a HifiBerry steel case (no fan) and am running underclocked as a music streaming client using piCorePlayer.
The temp seems to be tracking at just over 50C which seems fine. Don't have any comparison for running w/o the heatsink, though.”
“Mine doesn't fit in the orientation shown in the photo, but did when turned 90 degrees. It seems to knock about 10 deg. C. off the max. temperature my Pi 4 reaches (65 instead of 75) so I'm happy.”