AMD 3D V-Cache Technology Evaluation: Slightly Increased Latency Results in Improved Processor Performance

AMD 3D V-Cache technology has been in development for several years and will be publicly unveiled in 2021. This method employs chip stacking technology, which may boost CPU cache capacity by many orders of magnitude, significantly enhancing processor speed without requiring a change in the core area. The international press Chips and Cheese put AMD CPUs with 3D V-Cache through their paces, measuring the cache latency difference between the new EPYC processor and the old one.

Foreign media compared the AMD EPYC 7V73X (Milan-X) series to the previous EPYC 7763 (Milan-X) CPU. The former has 768MB L3 cache, whereas the latter has 256MB L3 cache, which is just one-third of the former. EPYC 7V73X contains 64 cores and 128 threads, a 2.2GHz main clock, and a 3.5GHz accelerated frequency.

According to the findings of the tests, 3D V-Cache technology would marginally increase L3 cache latency, whereas Milan-latency X's will rise by 3-4 cycles. The performance boost provided by the big cache compensates for the modest increase in latency. Although the EPYC 7V73X's primary frequency is lower, its performance is higher. AMD's new Milan-X series server which will still use the Zen 3 processing architecture, will be formally delivered by the end of 2021. The flagship model, the 7773X, has 64 cores and 128 threads, a TDP of 280W, and a price tag that approaches $10,000 USD.

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