DDR5 settings
The BIOS settings are mostly identical to previous Zen platforms, except that DDR5 has been added. JEDEC and EXPO or XMP profiles can be loaded under DRAM Profile Configuration, whereby the subtimings are also displayed and consistently adopted here.
In addition to the voltages for VDD, VDDQ and VDDIO (VDD2), the other relevant voltages for memory controllers and Infinity Fabric are also set at the same time. The BIOS also differentiates between DDR5 memory ICs here and behaves slightly differently with Samsung and Hynix RAM, for example. The 2000 MHz Infinity Fabric Frequency (FCLK) is also automatically set together with the RAM profile, so everything is theoretically done with one click for the average user.
For the voltages such as SOC, VDD Misc, VDDG CCD, VDDG IOD and VDDP, motherboard manufacturers recommend not exceeding a limit of 1.45 V All these voltages, with the exception of SOC, do not scale that far anyway and should accordingly only ever be increased gradually. In some cases, however, it can be used to stabilize a slightly unstable configuration, as can also be seen in my manual RAM OC Configs on the following pages.
Timings that do not exist and that you might know from other platforms are for example: tCWL, tREFI, tRCDWR, tCR. For example, the command rate in the OS is also always read out as 1 and is fixed. In addition, the minimum timing values are always enforced according to JEDEC so that tWR, for example, cannot be set below 48 and tFAW cannot be set below 20. The latter doesn’t make sense to me yet, since this timing should actually result from 4 * tRRD_S – if any reader here knows more, feel free to let me know in the forum.
Now the DRAM performance mode can be set additionally, which controls further subtimings. The options “Competitive” and “Aggressive” currently still have the same timings, but offer pre-optimized subtimings that are also tweked to the installed memory ICs. In my tests, these competitive and aggressive timings always worked and never led to instability. They also provide a good entry point for further manual RAM OC.
- 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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