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Preliminary analysis of AMD 7-nm RYLON CPU: performance increases by 15%, power consumption decreases, cost or not low

via:Expreview超能网     time:2019/1/10 17:03:00     readed:290

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Anandtech at the CES ConferencewebsiteSome analysis has been done for the 7-nm Reyron processor, and a lot of details have been published.

It's no secret that the 7-nm Reyron processor actually consists of a 7-nm CPU module and a 14-nm IO module. AMD said it was not only the world's first 7-nm game CPU, but also the first CPU to support PCIe 4.0. At present, the frequency and specifications of this processor are uncertain. AMD officials have not actually confirmed that it is 8 cores and 16 threads (although there is no doubt about that), but it still uses AM4 package, compatible with existing 300 and 400 series chipsets. However, after PCIe 4.0, new X570 chipsets may be needed. Anandtech also mentioned that many 300 and 400 series chipsets are now available. The first PCIe slot mainly follows the signal integrity specification. After upgrading the firmware, it can be used on the PCIe 4.0 graphics card.

They also estimated the core area of the 7-nm RYLON three-generation processors according to the 40x40mm specification of AM4 package, which is divided into two parts. Firstly, the CPU core module is measured to be 10.53x7.67=80.8mm2, and the IO chip area is 13.16x9.32mm=122.63mm2.

AMD released the multi-core running score of Cinebench R1 5 at the launch site. Combining their previous 7,2700X multi-core score of 17,544 and their previously estimated Zen 2 processor score, the performance of the R1 5 was improved by 15.3%. Although the R15 test is ideal for AMD, the exact frequency is not known, so this depends on the workload.

As for Core i9-9900K, their internal test R15 score is 2032, 8-core AMD Zen 2 score is 2023, Core i9-9900K score is 2042, both platforms are tested under the same air-cooled heat dissipation. Among them, 9900K can run at the standard frequency on Asus motherboard, AMD processor has not published the frequency, but AMD confirms that other components, such as CPU, motherboard, such as memory, power supply. Operating system, patches and Vega 64 graphics cards are the same.

The power consumption of the two platforms tested by AMD is 180W and 130W respectively (actually 133W in the demonstration). Anandtech estimates the standby power consumption of the two platforms is about 55W according to their previous evaluations, and calculates the power consumption of the two chips. Zen 2 is 75W and 9900K is 125W, which means that the Zen 2 power consumption of AMD is only 60% of that of the latter. This indicates that the performance of AMD in testing with Intel's latest processors is basic. Same, but lower power consumption, only about half the level of the latter.

AMD has previously published some key improvements in Zen 2 architecture, such as branch prediction unit, reforested prefetcher, better micromanipulation and cache management, larger micromanipulation cache, increased bandwidth of dispatching unit, increased native 256 bit floating point support, etc. However, how AMD achieves so much lower power consumption under the same performance is still a mystery.

According to the announcement, Intel's 9900K can run at 4.7GHz core frequency. AMD's processor frequency is unknown and is not the final product. But if the power consumption of the processor is only 75W, they can also increase by 20-30W, so that the performance and frequency will be higher.

It is not known how the 7-nm technology of TSMC used by AMD works in terms of frequency. At present, the 7-nm technology is used in mobile phone chips below 3GHz, which is not comparable. In order to compete with 9900K, the full-core frequency of AMD processors should reach 4.7GHz only when IPC performance is similar.

On this issue, Anandtech summarizes three possibilities:

1. If the process frequency of TSMC is not as high as that, then the IPC based on AMD Zen 2 architecture is ahead of Intel, which is a great change in the modern X86 industry.

2. It would be interesting if TSMC's 7Nm technology could exceed 5.0GHz frequency and have more room to improve power consumption.

3. AMD's hyperthreading optimization for Cinbench R15 software has exceeded the world level

The last question is about the number of CPU cores. In fact, a previous interview with Su Zifeng also mentioned this problem. That is, AMD's 7-nm Reyron may have more than 8 cores and 16 threads. From the perspective of CPU encapsulation, there is still room for an additional CPU core module. In theory, it is possible to make 16 cores and 32 threads processor.

But there's another problem, Anandtech said, when they communicated with industry professionals, they got the message that AMD packaged TSMC and GF chips together at a low cost. Processors less than $100 are unlikely to use this solution.

In fact, there have been similar rumors before, that is, after the advent of the three generations of Reyron, it will not completely replace the existing 14/12 nm processors, at least in the low-end market or the current products, 7-nm processors may dominate the high-end market.

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