PC Ekspert Forum - View Single Post - AMD Ryzen "ZEN4" (7000 CPU / 8000G APU series) Info thread

The Exiled · 30.10.2022., 13:30

DDR5-6000 je za Zen 4 ono kaj je DDR4-3600 ili DDR4-3733 bilo za Zen 3.

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On Ryzen 5000, the ideal configuration for memory overclocking was to run the fabric clock, memory controller, and memory clock all in sync at the same frequencies. This made DDR4-3600 the typical “sweet spot” for the platform, as going faster would typically require running parts of the CPU out of sync so that they could stay within their own attainable clockspeeds. But for Ryzen 7000, AMD has loosened things up a bit. Ryzen 7000 systems can still get improved memory performance even when the fabric clock is allowed to go out of sync with the memory controller. As a result, most overclockers can just leave that clock set to Auto, and instead focus on keeping the memory and memory controller clocks in sync in a 1:1 ratio. Specifically, when the fabric clock is set to Auto, it’s typically run at 2000MHz.

Meanwhile the memory and memory controller clocks will be running at anywhere between 2400MHz and 3000MHz, depending on the speed of the RAM kit used. Ultimately, the goal for the best performance is to get the fabric clock to 2000MHz and then keep the memory/MC clock at 3000MHz or less. Otherwise, if memory speeds exceed 3000MHz (DDR5-6000), then the memory controller will fall to 1:2 with the memory frequency, which will incur a performance hit. It should be noted that AMD’s idea of optimal memory speeds here is high memory clocks with low memory latencies, rather than pushing the absolute fastest memory clocks. On good chips it should be possible to drive Ryzen 7000 at speeds above DDR5-6000

Izvor: AnandTech