How important is DDR5 RAM speed for gaming?

Take a look at two DDR5 kits, and all that will separate them is a pair of numbers on the box. How important these numbers are for gaming depends on your preferences and the thickness of your wallet. Moving from the slowest kit to a mid-range kit might net you a bit of extra performance, but going further will make almost no difference, even if it will cost you up to hundreds of dollars more in a crazy RAM price.

This is because there is no DDR5 speed required by a particular game. Any game running on DDR5 will do just fine on the lower end DDR5-4800 kits on the market. At the high end of what’s available, the DDR5-7200 and DDR5-8400 kits improve frame rates slightly during CPU-bound gaming.

All DDR5 kits have a four-digit number, such as DDR5-6000 CL30. The number added to DDR5-XXXX is the data throughput in millions of transfers per second, while CLXX is the latency, counted in clock cycles. Many people confuse data rate with clock speed because it looks like a clock speed. But that’s not the case. The clock on a DDR5-6000 kit runs at 3,000 MHz, and the memory moves data both up and down, or 6,000.

CL30 or CL36 is the CAS latency. In other words, these are the clock cycles between the processor asking something and the memory responding. And because these cycles shorten as the clock increases, a DDR5 kit can have a larger CL without being slower to respond. Multiply the CL by 2000, divide by the data rate and you’ll get the real figure in nanoseconds: 10 for a DDR5-6000 CL30 kit and almost 17 for a “cheap” DDR5-4800 CL40 kit.

JEDEC’s standard timings keep this number close to 14 nanoseconds, from DDR5-3200 to DDR5-8800, so faster kit with proportionately looser timings is not faster, but wider once the data is flowing. This is the difference between budget kits, which sit at DDR5-6000 with CL36 or CL40, and premium kits, which either tighten down to CL30 or CL28 at the same speed, or upgrade to DDR5-9600 with CL34 to CL46.

AMD’s spec sheet for a Ryzen 9000 processor lists DDR5-5600 as the supported memory speed. For older Ryzen 7000, DDR5-5200 is the supported speed. That’s the speed AMD has validated for two regular RAM sticks, but it’s slower than what everyone ends up installing. Almost all AMD releases have a DDR5-6000 kit, as Ryzen’s memory controller can run at the same clock as the memory up to around 3000 MHz. If you install anything faster, the controller will revert to half the memory clock to keep up, adding delay to each request and negating the speed you paid extra for. Tom’s materialfor example, showed how the DDR5-6000 CL30 outperformed a DDR5-6400 CL32 kit even though the 6400 is faster on paper.

The Intel Core Ultra 200S desktop chips give us a little more breathing room. This processor can output DDR5-6400 with CUDIMMs (basically modules with their own clock driver) or DDR5-5600 with regular RAM sticks. Corsair, on the other hand, claims that DDR5 between 6400 and 7200 is best for 13th generation Intel. But keep in mind that Corsair is a memory manufacturer that talks about its own high-end products.

In short, no. Okay, yes, “low end” DDR5 kits are slower on paper, but that’s really all it allows for most consumer use cases. DDR5-4800 is the launch speed of 2021 for better efficiency and the baseline for which every DDR5 processor is designed. In Intel tests of Tom’s materialThe worst-performing 32GB kit, a free-time DDR5-6400, finished about 4% behind the fastest across a range of heavy productivity work.

DDR5-5200 is just above. This is the speed validated by AMD for Ryzen 7000, and a 4800 or 5200 kit is perfectly suited for gaming. Meanwhile, the high end continues to climb higher and higher. JEDEC, the organization that develops open standards for microelectronics, has raised the official limit to 8,800 MT/s in 2024, and the fastest kits now run at 9,600. By bathing a Corsair kit in liquid nitrogen, Gigabyte managed (for the love of gaming) to push it to 13,556 MT/s at June’s Computex event, but that’s neither here nor there.