CPU-OC settings
At the top of the OC Tweaker, ASRock offers the option for good old static CPU OC via fixed frequency and voltage. However, this only really works for light load scenarios like Cinebench or Timespy in my experience. In really demanding applications, a higher stable CPU clock rate can be run with the standard PBO settings. By the way, the temperature limit in manual overclocking is then 115 °C, while it is limited to 95 °C in PBO mode.
The temperature is the main limiting factor due to the high heat flux density, so more than 1.25 V on my 7950X 16-core CPU cooled with a 360 mm AIO does not improve the stability. CPUs with fewer cores might benefit more from more juice. The following limits are recommended by mainboard manufacturers for the CPU voltage:
- 7950X: 1.30 V
- 7900X: 1.35 V
- 7700X: 1.40 V
- 7600X: 1.45 V
The silicon limit of 1.52 V specified by AMD is rather theoretical and is only reached by PBO in boost situations for a short time. For manual overclocking under normal temperatures, this limit should never be reached.
Speaking of PBO, the various options around the Precision Boost Overdrive can be found in the Advanced tab under AMD Overclocking. Users of previous Zen platforms will also find themselves at home here, with the usual options for limits, boost overrides and co. AMD again limits the 7950X to 180 A TDC and 250 W EDC, so that no real additional performance can be achieved without undervolting or Curve Optimizer.
In the corresponding Curve Optimizer menu, offsets can be set for the entire CPU or for individual cores, as in Zen 3, to increase efficiency and enable even higher boost clock rates. At least theoretically, because with my current BIOS based on AGESA 1.0.0.1 this does not work properly yet. The maximum clock rate currently seems to be capped at 5.75 GHz, even though the TDC and EDC limits have not yet been reached according to Ryzen Master in the OS. Hopefully, a patch will soon remedy this. All tests were performed accordingly with PBO Auto.
For both types of CPU overclocking, the VRM configuration is of course also relevant, which can be found in the External Voltage Settings. Here the usual VRM settings like Load Line Calibration for VDDCR_CPU (Vcore) and VDDCR_SOC (Vsoc), as well as other smaller voltages can be set.
Other settings worth knowing
The AGESA version can be found under Advanced, AMD PBS, AMD Firmware Version.
Turning off the iGPU under frees up 1-2 watts of additional power resources for the CPU in PBO.
An LN2 mode and a separate LCLK that controls the clock rate of IO interfaces like USB are also available as extra options. The latter is presumably a consequence of the USB problems with previous Ryzen CPUs, although I could not find any confirmation for this yet.
- 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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