Summary and Recommendations
In conclusion, Zen 4 also breaks with some of the conventions of previous Zen CPUs in terms of tuning. For example, the Infinity Fabric (FCLK) now runs independently of the RAM controller (UCLK) and RAM (MCLK) and has its new sweet spot at 2000 MHz, which is also set automatically when loading EXPO or XMP profiles. Higher FCLK clock rates have to be set manually, but are of relatively little importance for the overall performance.
DDR5 RAM automatically runs in 1:1 mode between UCLK and MCLK up to a clock rate of 6000 Mbps and in 2:1 mode above that. However, the 1:1 mode can still be set manually and operated stably with higher clock rates like DDR5-6400, even in dual-rank with 4x 16 GB. Unlike Zen 3, the 2:1 mode does not have any major performance disadvantages, so the advantage of the higher clock rate could already outweigh from DDR5-7000 onwards. Unfortunately, we have not been able to test this yet – as soon as this changes, we will of course post a retest.
EXPO RAM at 6000 Mbps in 1:1 mode and FCLK at 2000 MHz is the best compromise between effort and performance for most users, and already works without problems. The alternative performance modes like “Aggressive” are an interesting additional option that can offer more performance and an entry point for further tuning. Whether this will cause stability problems will only be seen when it is used by the masses. Below I have once again the most important tuning parameters for a quick overview for you:
Safe voltage values
- Vcore (static OC), depending on CPU and heat flux density:
- 7950X: 1.30 V
- 7900X: 1.35 V
- 7700X: 1.40 V
- 7600X: 1.45 V
- Vcore (Silicon Max, PBO): 1.52 V
- SOC, VDD Misc, VDDG CCD, VDDG IOD, VDDP:
1,45 V1.30 V
Since April 2023 it is known that too high SOC voltage can impact the longevity of the CPU. Thus it is recommended to stay below 1.30 V SOC voltage. Also if you load an EXPO profile, it is recommended to check and if needed correct the SOC downward.
Thermal limits
- static OC: 115 °C
- PBO: 95 °C
Hard PBO limits
- PPT: 1000 W
- TDC: 180 A
- EDC: 250 A
Now it only remains for me to say thank you to ASRock and AMD for providing the motherboard and CPU, and to wish you a lot of fun tuning the new Ryzen 7000 CPUs. If you have questions, suggestions, experience reports, improvement requests, leave them to us as always happy in the forum (whether German or English 😉). Oh yes, I also set a few benchmark records with the manual dual-rank config on the side, with the 16 Zen 4 cores doing most of the work, of course:
- 1 - What's new with Ryzen 7000?
- 2 - Test Setup and Software Tools
- 3 - BIOS Settings (1/2) – DDR5
- 4 - BIOS Settings (2/2) – CPU-OC and other
- 5 - Tested Configurations (1/2)
- 6 - Tested Configurations (2/2)
- 7 - Synthetics (1/2) – LinpackXtreme, AIDA64, Geekbench 3
- 8 - Synthetics (2/2) – SuperPi 32M, PyPrime 2.0 2B, Timespy CPU
- 9 - Gaming QHD, FHD – ACC, CSGO, SoTR
- 10 - Summary and Recommendations
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