AMD recently announced the introduction of a new graphics card for Apple's Mac Pro, the AMD Radeon PRO W6600X.

The AMD Radeon PRO W6600X is based on the AMD RDNA 2 architecture and features AMD Infinity caching technology and other advanced technologies that provide outstanding graphics performance support for professional applications and jobs on apple Mac Pro.
Previously, AMD has launched a number of graphics cards designed based on the RDNA 2 architecture for Apple's Mac Pro, such as AMD Radeon Pro W6900X, AMD Radeon Pro W6800X and AMD Radeon Pro W6800X Duo. The new AMD Radeon PRO W6600X is positioned even lower and can be adapted to the low-priced Apple Mac Pro.
【AMD Radeon Pro W6600X Graphics Card Specifications】
Stream Processor: 2048
Memory interface: 128 bits
Unlimited cache: 32 MB
Video memory: 8GB GDDR6
Peak memory bandwidth: 256 GB/s
In terms of graphics card specifications, the AMD Radeon PRO W6600X is very similar to the RX 6600 XT, both are 2048 stream processors, and the video memory specifications are the same. The former is approximately equal to the Apple Pro version of the RX 6600 XT.
I put a GPU-Z screenshot of the RX 6600 XT graphics card, and let's see if it is very similar to the AMD Radeon PRO W6600X.