Is DDR5-6000 CL30 faster than DDR5-7200 CL34?

In true latency, the DDR5-7200 CL34 kit is: 34 × 2000 ÷ 7200 = 9.44 ns, against 30 × 2000 ÷ 6000 = 10.0 ns for the CL30 kit. The higher-stated CL is the quicker one because its clock is higher.

Does lower true latency always mean better performance?

It is the right single figure for the speed-versus-timings trade-off, but capacity and bandwidth still matter more for some workloads. It settles the CL argument, not the whole buying decision.

RAM PRIX

True-latency calculator

CAS latency is measured in clock cycles, not time, so a bigger CL number is not automatically slower — it depends on the clock. True latency converts both into one figure that compares directly. Type a speed and CAS latency below, or pull a real kit from the catalog to see which is genuinely quicker.

Configurations

Configuration 1

Memory typeSpeedCAS latency

True latency10.00 ns

Slowest

Configuration 2

Memory typeSpeedCAS latency

True latency9.44 ns

Fastest

DDR5-7200 CL34 has the lowest true latency at 9.44 ns, against 10.00 ns on the DDR5-6000 CL30 — a 0.56 ns gap, or 5.6% less.

Add a kit from the catalog

Corsair Vengeance LPX DDR4-3200 2x16GB 2400 CL14
DDR4 · 2400 MT/s · CL14 · 32GB · $5.311
11.67 ns
G.Skill Ripjaws DDR4-3200 SODIMM 1x32GB
DDR4 · 3200 MT/s · CL22 · 32GB · $5.625
13.75 ns
Crucial DDR4 SODIMM 2666 1x16GB
DDR4 · 2666 MT/s · CL19 · 16GB · $5.818
14.25 ns
Timetec Premium DDR4-2666 UDIMM 2x16GB 2400 CL17
DDR4 · 2400 MT/s · CL17 · 32GB · $5.875
14.17 ns
ADATA XPG Gammix D10 DDR4-3200 1x32GB 3200 CL22
DDR4 · 3200 MT/s · CL22 · 32GB · $5.937
13.75 ns
PNY Performance DDR4-3200 SODIMM 2x16GB CL20
DDR4 · 3200 MT/s · CL20 · 32GB · $5.937
12.50 ns
Timetec Premium DDR4-2666 UDIMM 2x16GB
DDR4 · 2666 MT/s · CL19 · 32GB · $5.937
14.25 ns
Crucial DDR4 SODIMM 2666 1x16GB 2133 CL15
DDR4 · 2133 MT/s · CL15 · 16GB · $5.958
14.06 ns
Crucial DDR4 SODIMM 2666 2x16GB 2400 CL17
DDR4 · 2400 MT/s · CL17 · 32GB · $6.094
14.17 ns
Timetec Premium DDR4-2666 UDIMM 1x16GB
DDR4 · 2666 MT/s · CL19 · 16GB · $6.124
14.25 ns
Corsair Vengeance LPX DDR4-3200 4x16GB 2400 CL14
DDR4 · 2400 MT/s · CL14 · 64GB · $6.249
11.67 ns
G.Skill Ripjaws DDR4-3200 SODIMM 2x16GB
DDR4 · 3200 MT/s · CL22 · 32GB · $6.25
13.75 ns

How true latency is calculated

True latency (ns) = CAS latency × 2000 ÷ data rate (MT/s)

Because CAS latency counts clock cycles, a slower clock with a tight CL can beat a faster clock with a loose CL. DDR4-3200 CL16 and DDR5-6000 CL30 both land at exactly 10.0 ns; DDR5-7200 CL34 is quicker again at 9.4 ns.

Read the full explanation of CAS vs true latency →

Common questions

Is DDR5-6000 CL30 faster than DDR5-7200 CL34?: In true latency, the DDR5-7200 CL34 kit is: 34 × 2000 ÷ 7200 = 9.44 ns, against 30 × 2000 ÷ 6000 = 10.0 ns for the CL30 kit. The higher-stated CL is the quicker one because its clock is higher.
Does lower true latency always mean better performance?: It is the right single figure for the speed-versus-timings trade-off, but capacity and bandwidth still matter more for some workloads. It settles the CL argument, not the whole buying decision.