Look at slide 6, "Die Architecture" (https://www.servethehome.com/wp-content/uploads/2023/08/Intel-Direct-Mesh-to-Mesh-Optical-Fabric_Page_06-scaled.jpg https:/

Look at slide 6, "Die Architecture" (https://www.servethehome.com/wp-content/uploads/2023/08/Intel-Direct-Mesh-to-Mesh-Optical-Fabric_Page_06-scaled.jpg https://www.servethehome.com/wp-content/uploads/2023/08/Inte...). The diagram shows 8 gray boxes (in 2 columns of 4). Each gray box is a core. Above that is a detailed view of what each core looks like. There's a middle section labeled "Crossbar", and above that are 3 boxes labeled STP, MTP, and MTP. Below that are another 3 identical boxes. So each core has 4x MTPs and 2x STP. What are those? The text of the same slide says MTP is "Multi-Threaded Pipelines" with "16 threads per pipeline" and STP is "Single-Threaded Pipelines" with (self-evidently) 1 thread per pipeline. And 4 * 16 + 2 * 1 = 66, so 66 threads per core.