Why will the 5800X3D be the only Ryzen with V-Cache so far?

AMD this week showed the only processor innovation from the desktop keg that will carry the V-Cache memory. This is a Ryzen 7 5800X3D, and it could be argued that AMD did not have to show them all and can still have other versions of current Ryzen upside down, enriched with a larger L3 cache. However, this is unlikely, as the Ryzen 7 5800X3D will not arrive until sometime in the spring, or in the second quarter, and Zen 4 is due in the third or fourth, at the latest, so AMD would probably introduce such processors now if it planned to launch them. Will Frank Azor confirm that for us?


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 percent compared to Ryzen without V-Cache, although the average will of course be much lower, and according to official data, 15 percent and more memory is 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 and also goes that AMD still wanted to have a TDP 105 W, some of which, of course, would take a chip with V-Cache, 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.

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, the V-Cache will be primarily for server EPYCs like Milan-X or their successors, so AMD might indeed be able to make a relatively flexible decision shortly before the arrival of the Ryzens 7000 whether or not to deploy a V-Cache. But then it puts speculation about 16-core CCD Zen 4 with V-Cache in 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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Source: Svět hardware by www.svethardware.cz.

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