It is worth mentioning in advance what Robert Hallock from AMD marketing said, according to which V-Cache is especially suitable for processors in game sets. It is well known that modern PC games are very sensitive to memory latency. It is software that is difficult to predict, as the game would have to guess how the player will behave, which is difficult. This keeps reading from memory, and data needs to be available as soon as possible. So if we can store more data in the fast L3 cache directly in the processor, there is a greater chance that it will not have to be read from RAM, which is why games can run faster.
According to Hallock, it can be up to 40% compared to Ryzen without V-Cache, although the average will of course be much lower, according to official data 15%, while more memory has more than to compensate for frequency loss. Compared to the Ryzen 7 5800X, the beats of the 5800X3D will be reduced from 3.8 to 4.7 GHz to 3.4 to 4.5 GHz due to the higher concentration of chips in a small place, which makes efficient heat dissipation difficult. It’s also that AMD still wanted to have a TDP of 105 W, some of which, of course, would take the V-Cache chip, so that’s why the beats had to go down. Thanks to overclocking, however, it will be possible to increase the frequency again, but of course the result is not guaranteed.
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But why isn’t there a Ryzen 9 5900X with V-Cache, on which AMD demonstrated this memory last year? As this is primarily a game, the Ryzen 7 5800X was chosen, which AMD sees as the most suitable in its offer for the given purpose. It is also a price, because the implementation of V-Cache is said to be expensive. From this point of view, it would not make sense to put it on dual-chip processors and, in fact, on less than 8-core processors, when it comes to such an expensive thing.
It is so clear that we will see V-Cache on only one Ryzen model so far, and AMD is going to see how it will be received by customers and how it will perform. Only then will they decide whether to offer more Ryzens with this memory, which at first glance seems like nonsense, because Zen 4 will come in the fall and AMD must have its plan. However, V-Cache will be primarily intended for server EPYC as Milan-X or their successors, so AMD might indeed be able to decide relatively flexibly shortly before the arrival of the Ryzens 7000 whether or not to deploy a V-Cache. But then it gives speculation about 16-core Zen 4 CCD with V-Cache to a completely different light, and according to her, this memory would be necessary in such chipsets, because they themselves should not have any L3 cache.
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