All configurations shown have been tested for stability using the tools described previously. Due to the number of configurations and a new BIOS with a new AGESA version, there was unfortunately not enough time for another RAM stability test including screenshots for all configurations. However, short stability tests and our complete suite of benchmarks were passed by every setting on the first try, so absolute stability should not be far away in the worst case.
4800 CL40 Default 1:1 SR, 1800 IF – All Stock
AMD officially supports up to DDR5-5200, with two RAM modules mind you. However, if you at least boot with the Launch AGESA 2x 16 GB DDR5, they start with the JEDEC settings for 4800 Mbps and tCL 40. As we know, many systems will run like this for their entire life and accordingly, this setting is our first test candidate, quasi as a worst-case reference.
4800 CL40 default 1:1 SR, 2167 IF – slow RAM without bottleneck?
The second setting is a sort of economy menu for those who need to pair their fast new Ryzen 7000 CPU with slow JEDEC RAM, for whatever reason. However, if you still want to get the maximum performance out of the platform, at least turn the FCLK to the stable maximum of 2167 with 1.3 V SOC voltage. Admittedly, this is an extremely theoretical scenario, but it also shows the sole impact of the FCLK on the overall performance with unchanged RAM. This should then also allow us to measure whether the relatively low clocked Infinity Fabric is actually a bottleneck for connecting the cores to the rest of the system, or whether smaller numbers just like to deceive.
6000 CL30 EXPO 5H16M SR, 2000 IF – the AMD recommendation
This setting is the sweet spot advertised by AMD a la “Auto:1:1” in DDR5-6000, which is probably also how most well-read users will operate. Unfortunately, I did not have an EXPO kit available at the time of the test, so I set the timings analogous to already known specifications of 6000 CL30 SKUs. An XMP kit from G.Skill is used for this, based on SK Hynix 16 Gbit M-Die ICs. At this point in time, simply no other ICs can reach 6000 CL30 and thus it is also clear that AMD EXPO kits will also have to use these ICs.
Specifically, to do this, I load the XMP settings in the BIOS from 6400 32-39-39-102 with 1.4V VDD/VDDQ and change the primary timings to 6000 30-38-38-96 with the appropriate tRC. The remaining voltages are automatically set by the BIOS: 1.4 V VDDIO, 1.3 V SOC, 1.1 V VDD Misc, 1.2 V VDDG CCD, 1.2 V VDDG IOD, 1.1 V VDDP. The FCLK is set to 2000 MHz and the UCLK DIV1 MODE is set to UCLK=MEMCLK (1:1). Unless otherwise described, the following configurations also use these voltage settings.
6000 CL30 EXPO Aggr 1:1 5H16M SR, 2000 IF – “aggressive”, pre-optimized subtimings
As already mentioned in the BIOS settings, a DRAM performance mode menu is also displayed under the selection of the EXPO or XMP profile, where you can choose between the standard and optimized subtimings. With the Aggressive preset, some subtimings are set to significantly tightened values, which should bring a decent performance boost. By the way, the BIOS also differentiates here which RAM ICs are installed and adjusts the values accordingly.
6000 CL30 EXPO 2:1 5H16M SR, 2000 IF – half IMC clock without disadvantage?
Here the EXPO standard timings are used again, but this time the UCLK DIV1 mode is set to UCLK=MEMCLK/2, i.e. to 2:1 mode. The memory controller with its UCLK thus only runs with half the clock rate of the working memory (MCLK), which previously caused a big disadvantage in latency with the predecessor generations of AMD CPUs. Whether this is also the case for Zen 4 will be seen in the tests with this config.
- 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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