![]() ![]() 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. 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. Specifically, when the fabric clock is set to Auto, it’s typically run at 2000MHz. 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. 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. 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.īut for Ryzen 7000, AMD has loosened things up a bit. 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. And thanks to a combination of the switch to DDR5 memory, changes to AMD’s memory controllers, and changes to AMD’s power delivery infrastructure, the rules have changed. ![]() JEDEC standard speeds aside, the Ryzen 7000 series will also support memory overclocking. Though it’s largely a moot point for today’s launch anyhow, since although DDR5 ECC UDIMMs exist, they are in very short supply.Īlso, while we didn’t expect it to be supported to begin with, AMD has confirmed that Ryzen 7000 won’t support RDIMMS/LRDIMMs. For boards that aren’t doing validation, AMD can’t guarantee ECC is going to work. Unfortunately, the compatibility situation is essentially unchanged from the AM4 platform, which is to say that while the CPU supports ECC memory, it’s going to be up to motherboard manufacturers to properly validate it against their boards. Meanwhile, for system builders looking at reliability and data integrity as opposed to performance, AMD has confirmed that Ryzen 7000 also supports ECC memory. So for peak performance, it’ll be best to treat Ryzen 7000 as a 1 DPC platform. While Ryzen 7000 can drive a 2 DPC/4 DIMM setup, you’re going to lose 31% of your memory bandwidth if you go that route. So as was the case with Intel’s Alder Lake platform, system builders are going to need to put a lot more thought into how they go about adding memory, and how they’re going to handle future memory expansion, if at all. But, like all other DDR5 products we’ve seen thus far, 2 DPC comes with a significant penalty in that case the maximum JEDEC speed is reduced to just DDR5-3600. For AMD’s Ryzen 7000 desktop processors, which are based on the Zen 4 Raphael design, these chips offer support for official (JEDEC) speeds at up to DDR5-5200 for a 1 DIMM Per Channel (DPC) configuration. So why implement DDR4 support if it’s only going to be necessary for a short period of time?Īs for memory speeds and capacities supported, while AM5 enforces the use of DDR5, ultimately it’s the individual memory controllers that determine the rest. Ultimately, with AMD starting the DDR5 transition roughly a year after Intel, the company’s expectations are that DDR5 prices are going to continue falling fast enough that they’re going to reach parity with DDR4 before too long. There will be no such thing as a DDR4 AM5 motherboard, and AMD needs not bake DDR4 support into any of the Ryzen memory controllers. But at the same time, it simplifies things over the long run of the platform, especially since AMD is planning on supporting it through 2025. ![]() In the short term, this is going to drive up the total cost of an AM5 system relative to a theoretical AM5 system with DDR4 memory DDR5 simply costs more right now. Like other engineering decisions, this marks a trade-off being made by AMD. This is a true platform limitation, and there is no going back. Unlike rival Intel, who opted to support both DDR4 and DDR5 memory with their Alder Lake (12 th Gen Core) CPUs, AMD is only supporting DDR5 on the AM5 platform. In fact, socket AM5 only brings DDR5 support. Like AM4, which was introduced alongside AMD’s shift over from DDR3 to DDR4, socket AM5 is being rolled out to bring support for DDR5 for the platform. The final major feature being introduced with the AM5 platform is DDR5 memory support. DDR5 & AMD EXPO Memory: Memory Overclocking, AMD's Way ![]()
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