That's true.
So war wie only know the frequencies for the big chips.
But in previous generations the mid range chips never run noticeably faster. They are often even slower.
As I said. PS5 would be the exception to every rule so far.
The leaked 3080 spec I saw runs at a higher clock than the 3090. Smaller, but faster. They often can't make the larger GPUs hit the same clocks without going over power budgets or overheating the card.
The mid range smaller PC GPUs are intentionally designed to run roughly at same or slower clocks to make the performance gaps larger to sell more high end GPUs. They're not trying to make a smaller and a larger version of the same flagship GPU. They make 1 flagship, maybe 2 high end cards, then just make each one below that worse performance but lower price.
Its a business choice not a technical limit.
Not very relevant for this comparison. If the 5700 and the 6700 run at around the same frequencies, but the 6700 is much larger, then it makes perfect sense why the PS5 is able to be clocked so high. Its relatively small compared to the XSX GPU and upcoming 2020 PC GPUs.
By your logic, the Series X will also not be able to hit its clock because its still a high frequency GPU and much larger than the PS5 GPU. Thats not true either of course.
Microsoft said the 40 CU @ 1.172 GHz XONEX GPU and the 52 CU @ 1.825 GHz XSX GPU draw roughly the same power. They raised the frequency a lot, added a lot of additional CUs that are also each larger, and didn't have to raise the power draw.
RDNA 2 on 7nm is much more efficient clearly.
For PS5 Sony didn't add any more CUs, they just raised clocks a lot from the PS4 Pro 36 CUs @ 911 MHz. And each PS5 CU is roughly 60% larger than PS4 Pro GPU CUs. So its safe to assume the PS5 GPU is drawing roughly the same amount of power as the PS4 Pro GPU draws.
I see no reason why they can't hit the clocks they have. Both machines will likely have no issues. New architecture and a new smaller node process should explain why they were able to go to much higher frequencies with larger CUs with far more transistors.