Determine whether B200 chiplet L2 caches are internally partitioned

Determine whether the L2 cache within each chiplet of NVIDIA Blackwell B200 GPUs is further partitioned beyond the one L2 partition per chiplet documented by NVIDIA.

Background

The paper describes NVIDIA Blackwell B200 GPUs as integrating two chiplets into a single GPU, with official documentation specifying one L2 cache partition per chiplet and the two partitions connected by the LTC fabric. The authors note that the available documentation does not establish whether each chiplet’s L2 cache is itself subdivided into additional partitions. This unresolved architectural detail is relevant to accurately modeling B200 memory affinity and NUMA behavior.