Could a Series X have 56 CU 96 or 128 ROPS, if you add another 32 like you see with 40 CU count , otherwise you are limited ...
RDNA cards out today have 2 cluster of CUs with 20 CUs each and total of 32ROPs.
An hypothetical Xtower with 56CUs will have at least 3 cluster of CUs... that means at least 96 ROPs.
That if the RDNA ROPs is tied to the cluster of CUs like GCN.
The issue here is that 56CUs doesn't match 3 cluster of CUs.
If you have 18CUs in each cluster then you have 54CUs... not 56.
If you have 19CUs in each cluster then you have 58CUs... not 56.
Xtower probably needs 4 cluster of CUs to reach 56CUs... that menas 14CUs per cluster.
4 cluster using the actual RDNA config found in their desktop cards means 128 ROPs.
That is why I don't believe in some people saying Xtower has 56CUs because it doesn't fit in 3 clusters.
That is how RDNA looks with 2 Clusters (it is called Shader Engine) and 40CUs looks like: