Why do AM5 builders pick DDR5 6000 CL30?
This page narrows our UK RAM prices down to desktop DDR5 kits rated at 6000 MT/s with a CAS latency of 30. UK shops often list them as 6000MHz. For a Ryzen 7000 or 9000 build on socket AM5, this is the pairing Newegg's 2026 DDR5 guide and most others recommend.
The reason sits inside the processor. At 6000 MT/s the memory controller can keep pace with the memory clock in a 1:1 ratio. Engadget explains that beyond roughly 3,000 MHz the controller drops to half the memory clock, which adds delay, so a faster kit on paper can respond more slowly. It also points to Tom's Hardware results in which a DDR5 6000 CL30 kit finished ahead of a DDR5 6400 CL32 kit.
AMD does not guarantee this speed. It lists DDR5 5600 for Ryzen 9000 and DDR5 5200 for Ryzen 7000, and the Ryzen 7 9800X3D spec page gives 5600 with two modules. Getting to 6000 depends on the kit's EXPO profile, which AMD treats as overclocking.
What does CL30 mean in nanoseconds?
CL counts clock cycles, so the number alone says little. Multiply it by 2000 and divide by the data rate in MT/s to get the wait in nanoseconds, a form derived from Crucial's explanation of speed and latency. The table compares common kits.
| Kit | Sum | True latency |
|---|---|---|
| DDR5 6000 CL30 | 30 x 2000 / 6000 | 10 ns |
| DDR5 6000 CL36 | 36 x 2000 / 6000 | 12 ns |
| DDR5 6400 CL32 | 32 x 2000 / 6400 | 10 ns |
| DDR5 4800 CL40 | 40 x 2000 / 4800 | 16.7 ns |
| DDR4 3200 CL16 | 16 x 2000 / 3200 | 10 ns |
A 6000 CL30 kit answers as quickly as a good DDR4 3200 CL16 kit while moving far more data each second, and Crucial notes that at equal latency the faster kit wins. Engadget found that no game needs a particular DDR5 speed, and that kits well above this level add little in processor bound games for a much higher price.
32GB or 64GB: which DDR5 6000 CL30 kit should you buy?
Newegg's 2026 guide matches 32GB, as two 16GB sticks, to gaming with a browser and chat open, photo editing and light video work. This week that starts at £429.99 at AWD-IT. A 64GB kit of two 32GB sticks suits serious video editing, 3D rendering or local AI models, from £906.99. Every speed at those sizes is on our 32GB RAM prices and 64GB RAM prices.
Stay with two modules. AMD rates the 9800X3D at DDR5 5600 with two sticks and only DDR5 3600 with four, so if you might outgrow 32GB, buying a 64GB kit now beats adding a second pair later.
Intel builds work differently. Engadget notes that Core Ultra 200S runs DDR5 6400 with CUDIMMs and DDR5 5600 with regular sticks, and Newegg suggests 6000 to 6400 MT/s for Core Ultra. A 6000 CL30 kit fits either platform when it carries both profiles. Corsair, for example, sells an XMP version of its Vengeance 6000 CL30 kit for Intel boards next to Vengeance kits with EXPO and XMP, so look for EXPO in the listing if you build on AM5.
On price per GB, the cheapest kit here costs £13.12, against £11.41 for the cheapest desktop DDR5 kit at any speed. If a 5600 kit is clearly cheaper this week, the difference in games is small; our DDR5 RAM prices list them all.
Corsair's 32GB Vengeance 6000 CL30 kit is tested at 6000 CL30 and 1.40V, but its SPD defaults are 4800 MT/s CL40 at 1.1V. Turn on EXPO (AMD) or XMP (Intel) in the BIOS after fitting a kit, then check that the reported speed reads 6000.