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All-round victory over the i9-12900K!Ryzen 9 7900X/7950X first review: 5nm energy efficiency ratio crushing 10nm–Fast Technology–Technology changes the future

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All-round victory over the i9-12900K! Ryzen 9 7900X/7950X first review: 5nm energy efficiency ratio rolling 10nm

1. Preface: Zen4, which has been waiting for 2 years, is finally here

After fighting against the 10th and 11th generation Core processors in a row, facing the whistling Intel 12th generation Core processors, the Ryzen 5000 processor began to feel powerless.

In particular, the emergence of the i5-12600K has put the Ryzen 7 5800X processor in a very awkward situation, and it can only continue to reduce prices to meet the challenge.

On September 26, 2022, the Ryzen 7000 series processors with Zen4 architecture were finally released. With the new TSMC 5nm process technology and the greatly improved Zen4 architecture, its energy efficiency ratio will reach a level that is unmatched by rivals. High, repeat the glory of Zen3 vs Comet Lake.

All-round victory over the i9-12900K! Ryzen 9 7900X/7950X first review: 5nm energy efficiency ratio crushed by 10nm

This time AMD brought a total of 4 Zen4 processors, including 2 Ryzen 9, one Ryzen 7, and one Ryzen 5.

Among them, the flagship model is the Ryzen 9 7950X, with 16 cores and 32 threads, with a base frequency of 4.5GHz, an acceleration frequency of 5.7GHz, a 64MB L3 cache, and a 16MB L2 cache, with a thermal design power consumption of 170W.

The Ryzen 9 79500X has 12 cores and 24 threads, with a base frequency of 4.7GHz and an acceleration frequency of 5.6GHz. It also has a 64MB L3 cache, a 12MB L2 cache, and a thermal design power consumption of 170W.

This time our evaluation is based on these two Ryzen 9 processors, and the evaluation of the Ryzen 7 7700X and the Ryzen 5 7600X will be released later.

In fact, we all know that the biggest changes in Zen4’s architecture are two points: the first addition of the AVX 512 instruction set, and the double the capacity of the L2 cache on the basis of Zen3, reaching 1MB L2 cache per core.

Of course, to achieve a 13% IPC performance improvement, the above two points are obviously not enough.AMD also improved the memory controller of the Zen4 processor, surpassing the same-generation Intel Core processor for the first time in memory latency.

Although the memory controllers of Zen1, Zen2, and Zen3 processors are improving with each generation, there is always a considerable gap with the contemporaneous Intel processors in terms of memory latency. For example, when the Ryzen 9 5900X is paired with DDR4 4000C15 memory, the delay is only 56ns when the FCLK is at the same frequency, while the same memory can achieve an ultra-low delay of 43ns on the i9-11900K.

All-round victory over the i9-12900K! Ryzen 9 7900X/7950X first review: 5nm energy efficiency ratio crushed by 10nm

Due to the high frequency of DDR5 memory, it is difficult to keep FCLK at the same frequency, so Zen4 separates the FCLK frequency and maintains a fixed 2000MHz operating frequency, while the frequency of the memory controller (UCLK) = memory frequency (MCLK) .That is to say, no matter how high the memory frequency is, FCLK can keep stable at 2000MHz.

The UCLK frequency can be kept at the same frequency as MCLK within a certain range, but when the memory frequency is too high, it is necessary to set UCLK=1/2MCLK to operate normally.

All-round victory over the i9-12900K! Ryzen 9 7900X/7950X first review: 5nm energy efficiency ratio crushed by 10nm

For the Zen4 platform, AMD has developed a new EXPO standard. On the Gigabyte X670E AORUS XTREME motherboard, you can also set a low-latency memory mode to further reduce memory latency.

The FCLK frequency only needs to be fixed at 2000MHz, no matter what the memory frequency is.

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