CB did some CU scaling of RNDA vs RNDA2 vs GCN (represented by Hawaii) all locked to 1GHz to try to do an IPC comparison:
https://www.computerbase.de/2021-03/amd-radeon-rdna2-rdna-gcn-ipc-cu-vergleich/
As it happens Hawaii and Navi 22 have the same (main) bandwidth
Of course, the three card do not run at the same clock and Navi 10 vs Navi 22 is also 256 bit vs 192 bit.
So not entirely sure what these tests prove but a nice effort anyway.
rdna2 ipc is not lower than rdna1 so that test has some issues