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AMD Xiaolong Server CPU can also overshoot: performance jumps 1.5 times in an instant

via:快科技     time:2019/5/21 17:22:02     readed:90

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Almost any processor has different P states, representing different frequencies and voltages. For example, P0 corresponds to the highest performance. P1 and P2 will reduce frequency and voltage appropriately to save energy. By editing P states, the processor can be forced to run in different states.

@ nero243 netizens'super-frequency object is oneAMD Xiaolong 7551Quasi-flagship model, 32 core 64 threads, original reference frequency 2.0 GHz, acceleration frequency 3.0 GHz, support 8-channel DDR4-2666 memory, 128 PCIe 3.0, thermal design power consumption 180W.

However,The actual overfrequency is an engineering sample, the default frequency is only 1.6 GHz.

Over-frequency process is quite professional and complex. In short, first of all, find a board with a specific type of register (MSR) open and write the overfrequency settings to it.

The tool used is Asus's unofficial software ZenStates, which supportsWindowsLinux, although only support Asus motherboard, but fortunately the source code is published on GitHub, you can manually modify the EXE executable file, adjust the CHECK VENDOR part, can be used on other motherboards.

Let's just talk about the results.At 1.3V, it reaches 3.4 GHz at 1.375V and 3.8 GHz at 1.3V, and all 32 cores are fully open.

It should be noted that because ofThe serverPlatform is not designed for over-frequency, Vcore core core voltage can not be added too much, otherwise it will trigger the motherboard power supply overcurrent protection (OCP), at the same time, we must always pay attention to the temperature of power supply circuit, it is better to add an initiative.FanOf course, liquid nitrogen is better.

As for performance,At 1.6 GHz, the multi-core score of CineBench R15 was 214. After overclocking to 3.8 GHz, it reached 5116 points, which increased by 1.5 times.

This has basically caught up with the second-generation thread Ripper flagship, 2990WX.The latter is also 32 core 64 threads, frequency 3.0-4.2 GHz, measured results in 5200-5300 points.

https://img1.mydrivers.com/img/20190521/41c6e387e2ae49bbb31e3fbebd040b25.png

Achievements before and after EPYC 7551 overfrequency

Ripper's 2990WX Achievement

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