AMD’s new Ryzen 7000 desktop CPUs, based on the Zen4 micro-architecture, still use the same chiplet design as their predecessors, with a few small but not negligible changes. Igor already gave details about this in yesterday’s big review. Today we want to look at how to configure the new CPUs as optimally as possible and for this we will test no less than 10 different configurations of RAM ICs, ranks, clock rates, timings and of course Infinity Fabric speeds. A big thank you goes to ASRock, AMD, with whose support we were able to prepare this guide in time for the launch.
What’s new with Zen 4, AM5 and Ryzen 7000?
But what is actually new in Zen 4 Raphael compared to Zen 3 Vermeer and how does this affect the adjusting screws, which are left up to each user? Since the design with 1-2 compute cluster dies (CCDs) and one IO die remains, the connecting infinitry fabric with its clock rate (FCLK) is also still highly significant. The IO-Die then again communicates with the rest of the system via interfaces like PCIe 5.0 and DDR5 as usual. The number of RAM channels also remains the same, with effectively 2x 64 bit.
The “sweet spot” on RAM has changed from DDR4-3600 on Zen 3 to DDR5-6000 on Zen 4, and it’s actually there. No, AMD, we’re not forgetting the originally advertised 2000 MHz FCLK with DDR4-4000 on Zen 3, which never really worked, but thankfully this time it’s different. The Infinity Fabric or FCLK also runs a bit faster than on Zen 3, but not at 3000 MHz by far. Consequently, there can no longer be a 1:1:1 config with DDR5-6000, as there was with Zen 3.
At RAM clock rates beyond 6000 Mbps, the UCLK automatically goes into 1/2:1 mode, better known as 1:2. For example, if you activate an EXPO profile with DDR4-6400, the corresponding values are 3200 MHz for MCLK and 1600 MHz for UCLK. The FCLK remains capped at 2000 MHz, at least as long as it is not changed manually. For RAM clock rates below DDR5-6000, an average value is automatically set for FLCK between the base clock of 1800 MHz and the maximum of 2000 MHz, e.g. 1900 MHz for DDR5-5600.
The already mentioned EXPO profiles are technically nothing else than XMP profiles with a different memory address, really now. The stored timings and voltages are also the same, except that they have a different label and are located further back in the SPD. Consequently, it is also possible for RAM kits to contain XMP and EXPO profiles at the same time, with corresponding optimizations for the respective platform.
Kits with both standards are probably already in the works at the known RAM manufacturers and those who don’t want to wait can also flash an EXPO profile onto their XMP kit themselves and vice versa. Not that this is necessary, because at least on Zen 4 motherboards, an XMP profile can also be loaded directly in the BIOS without further ado. Kind of reminding of the G-Sync vs. Adaptive Sync saga, whereas AMD also followed up with the open standard back then and thus slowly but surely put an end to the proprietary certification policy, but I’m digressing again.
- 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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