Nvidia's latest GPUs, the RTX 5090 and RTX 5080, have been closely examined for their L1 and L2 cache configurations, as well as memory enhancements. According to recent reports by Tom's Hardware, the L1 cache size per Streaming Multiprocessor (SM) in both the RTX 5090 and RTX 5080 remains unchanged from the previous generation. For the RTX 5090, each SM on the GB202 chip is equipped with a 128KB L1 cache, identical to the AD102 chip found in the RTX 4090. With a total of 170 SM units, this results in a cumulative L1 cache of 21.25MB. The RTX 4090, by comparison, contains 128 SM units, yielding a total of 16MB L1 cache. Similarly, the RTX 5080 maintains a comparable setup to the RTX 4080. The minor difference in SM count between the two results in the RTX 5080 possessing a slightly larger aggregate L1 cache of 10.5MB compared to the RTX 4080's 10MB. The L2 cache in the RTX 5090 sees a significant upgrade, rising to 96MB, which marks a 33% increase from the RTX 4090's 72MB.
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