AMD talked about the architecture of Zen 2 and showed the new processors

The second part of the event AMD’s Next Horizon was dedicated processors.

First, a little history. Last year, the market was AMD Ryzen first generation. They were the first carriers of a completely new architecture Zen, which was wildly successful. Then followed HEDT processors Ryzen Threadripper and server Epyc.

This year we saw the second generation and Ryzen Ryzen Threadripper, based on the architecture of Zen+. From Zen it is not much different, except that the new CPU were 12 nm. And the server were not transferred to the Zen+.

And here next year waiting for Zen 2 is a much more modified version of the Zen/Zen+. Interestingly, first it will transfer that server CPU Epyc. Actually, yesterday’s event was mostly about the new AMD epic, and told, but also pay attention to the architecture as a whole. About new Threadripper Ryzen and said nothing.

So, to start a thesis about the architecture:

  • Processors with Zen 2 will be seminariruumi. Yes, this is when Intel has with 10 nm can’t handle.
  • It will be a lot of architectural improvements. Improve branch predictor, a computational pipeline and other features that few people understand.
  • Up to 256-bit will expand the block floating-point.
  • Will significantly increase IPC (instructions per clock). But this one is different. Someone wrote about 52%, someone- about 25%. I think the first option too fantastic.

Now more specifically. AMD said that the Zen 2 will bring a doubling of the number of processor cores. But if Epyc all know for sure the top of the CPU will get 64 cores — with the rest not yet so clear. I think the new Threadripper will also contain up to 64 cores, but whether 16 cores normal Ryzen is still an open question.

And now directly about the new Epyc. The main thing that interested me — the configuration of the crystals. It is no secret that Epyc and Threadripper in the current generation contain four crystal on the same substrate. Each crystal includes eight cores, but the CPU in the younger part of the crystals is simply disabled or even broken. Issue senior Epyc and Threadripper second-generation NUMA — nonuniform memory access. This is due to just configuration of crystals — only two of the four have direct access to the controller memory, i.e. the RAM, while the other two are forced to access memory through a “middleman” in some cases, significantly reduces performance. Now, in a new AMD CPU, this is no problem because… see for yourself.

Yeah, that’s how under the hood looks new Epyc, so that they will look new Threadripper. Eight of crystals — it is just seminomatous CPU. Each crystal contains eight processor cores. The Central crystal itself AMD did not call, but in an early leak it was called the System Controller. In General, this chip containing the memory controller, controllers, I/o and so on. She, by the way, will be on 14-nanometer process technology.

Left — the current generation of Epyc, right next

This arrangement received the name Chiplet Design. She has a lot of advantages. First, as the previous mnogoshipovyh layout AMD, this solution allows to significantly reduce the cost of production, since it is unnecessary to produce complex crystals and, consequently, reduced the yield of worthless chips. Second, this solution allows to use broken crystals for the production of Junior processors with fewer cores. Third, further reduced the production cost also due to the fact that structurally, all models of CPU in the line is identical. And, fourth, specifically this arrangement solves the problem with NUMA, because all cores have direct access to the memory controller. By the way, is used for this interface Infinity Fabric.

It is also worth noting that the new CPU (again an industry first) received support PCIe 4.0.

Now to the dessert. At the event, AMD did not fail to compare his new creation with competitors. Nameless until a 64-core CPU Epyc new generation, which, incidentally, is called the Rome, compared with dual-processor system that includes a pair of CPU Intel Xeon Platinum 8180. At the moment it is the most high-end processors, Xeon Scalable platform. Each contains 28 cores with a frequency of 2.5 to 3.8 GHz, has a TDP of 205 watts and costs 10 000 dollars. The result can see for yourself.

The Intel, as we have already mentioned, introduced a 48-core processor generation Cascade Lake-AP, which will compete with the new Epyc, but, apparently, the chances of Intel in this confrontation is not enough.

As for the new generation Ryzen, which we all await, it will appear after a server CPU approximately in mid-2019. That there will be, until we can only guess.

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