PC Builder

RAM latency for PC builders: DDR5-6000 CL30 is the sweet spot in 2026

Last updated 2026-06-24

Buy DDR5-6000 CL30 for your 2026 build. At 10 ns it costs less than flagship kits and beats the 16.7 ns of the DDR5-4800 CL40 JEDEC default.

True Latency

First-word latency (CL)

10.00 ns

Time from a read command to the first bit of data arriving.

I/O bus clock

3000 MHz

Cycle time

0.333 ns

tRCD delay

12.67 ns

tRP delay

12.67 ns

tRAS

26.00 ns

tRC (tRP + tRAS)

38.67 ns

Peak bandwidth per channel48.0 GB/s

Assumes one 64-bit channel. Dual channel doubles this, quad channel quadruples it.

DDR5-6000 CL30 at 10 ns, pre-loaded. Drop the CL to 28 or push the speed to 7200 and watch the true latency change.

Edit in the full tool

PC builders comparing RAM kits need to look past the marketing MT/s number and calculate true latency in nanoseconds. DDR5-6000 CL30 lands at 10.0 ns, a common pick for both AMD Ryzen 7000/9000 and Intel 12th gen and newer. Faster kits cost more but don't always deliver lower latency.

Why this matters for you

The formula is (CL x 2000) / MT/s. DDR5-7200 CL34 looks faster on paper but at 9.4 ns it's only 0.6 ns quicker than DDR5-6000 CL30. Kits at that speed usually cost more and can need manual tuning to run stable. DDR5-4800 CL40, the JEDEC default, sits at 16.7 ns, 67% higher than DDR5-6000 CL30. In CPU-bound 1080p games, the gap between 10 ns and 16.7 ns can show up in frame rates, by an amount that depends on the game and CPU.

Same latency, different kits

True latency stays the same whenever CL rises in step with speed. DDR4-3200 CL16, DDR4-3600 CL18, DDR5-5600 CL28, DDR5-6000 CL30 and DDR5-6400 CL32 all land at 10 ns. The faster kits win on bandwidth instead. Dual channel DDR4-3200 tops out at 51.2 GB/s, while dual channel DDR5-6000 reaches 96 GB/s.

Speed alone doesn't tell you much either. DDR5-6000 CL36 sits at 12 ns, 20% slower to the first word than a CL30 kit at the same speed. DDR5-8000 CL38 reaches 9.5 ns, only half a nanosecond quicker than the 10 ns kits.

Read all four timings

Kits list four numbers, like 30-38-38-78. The first is CL. The next two, tRCD and tRP, set how long the memory takes to open and close a row, and they count whenever an access misses the open row. Two kits with the same CL can differ by a nanosecond or more there, so enter all four in the calculator.

Get the speed you paid for

A new kit usually boots at a slower JEDEC default until you turn on its EXPO or XMP profile in the BIOS. Check the speed in your system info after the first boot. Four sticks of DDR5 are also harder on the memory controller than two, and boards often need a lower speed to stay stable with four. Two sticks are the easier path to a 6000 MT/s build.

Verdict

DDR5-6000 CL30 is a good default for AMD and Intel builds. Choose a faster kit only if its true latency in nanoseconds is lower, and turn on the EXPO or XMP profile so it runs at the rated speed.

Open the RAM Latency Calculator

Frequently asked questions

Why is my DDR5 running at 4800 MT/s?

The kit is running a JEDEC default. Turn on its EXPO or XMP profile in the BIOS to use the rated speed and timings. Some kits fall back to a different JEDEC speed, but the fix is the same.

Is DDR4-3200 CL16 slower than DDR5-6000 CL30?

Their first word latency is the same, 10 ns. DDR5-6000 has far more bandwidth, 96 GB/s against 51.2 GB/s in dual channel, so it does better in tasks that move a lot of data.

Should I buy CL28 or CL30 at DDR5-6000?

CL28 works out to 9.33 ns against 10 ns, about 7% lower. It's a small gain, so only pay a little extra for it, and check that tRCD and tRP are tight too.