Navi 21: 80 CUs, 2.2 GHz boost clock and 22.5 TFLOPs of compute
Navi 22: 40 CUs, 2.5 GHz boost clock and 12.8 TFLOPs of compute
"TLDR":
Navi 23 has 32 CUs and 128-bit memory interface.
Navi 31 mostly has the same specs as Navi 21, but on RDNA 3 (gfx11).
Cezanne has the same GPU configuration as Renoir.
Van Gogh has 8 RDNA 2 CUs.
Rembrandt has 12 RDNA 2 CUs (btw it also has VCN 3.1).
Navi 21 and Navi 22 have significantly higher clocks than Navi1x.
Navi 22 uses 16 GT/s GDDR6 with a bus width of 192-bit for a bandwidth of 384 GiB/s.
Navi 21 supports both HBM2 and GDDR6, though I'm not really sure what it will mean in practice.
Edit: for HBM2 we need to multiply by 2 not by 4
Number of CUs of Navi 23, Navi 31, Van Gogh, Cezanne and Rembrandt from macOS 11 beta (also Navi 21 and Navi 22 power and clocks) : Amd - Reddit