6000 CL30 or 6400 CL32? The answer is a single division — real latency in nanoseconds — plus knowing when bandwidth wins instead.
Updated 11 Nov 2026 · 7 min read
Quick answer
Neither matters alone — what your CPU feels is latency in nanoseconds: CL × 2000 ÷ speed (MT/s). DDR5-6000 CL30 and DDR4-3200 CL16 both equal 10ns. For gaming on modern platforms, frequency (bandwidth) helps up to the platform’s sweet spot, then latency decides. Compare any two kits in seconds with our latency calculator.
Contents
Do the maths once, use it forever
| Kit | Calculation | Latency |
|---|---|---|
| DDR4-3200 CL16 | 16 × 2000 ÷ 3200 | 10.0ns |
| DDR4-3600 CL18 | 18 × 2000 ÷ 3600 | 10.0ns |
| DDR5-6000 CL30 | 30 × 2000 ÷ 6000 | 10.0ns |
| DDR5-6000 CL36 | 36 × 2000 ÷ 6000 | 12.0ns |
| DDR5-6400 CL32 | 32 × 2000 ÷ 6400 | 10.0ns |
Notice the pattern: CL numbers look scary on DDR5 only because the clock doubled. In nanoseconds, good DDR5 kits match good DDR4 kits — while delivering nearly double the bandwidth.
When each one wins
- Bandwidth (frequency) wins for integrated graphics, large data movement, and Ryzen systems up to the 1:1 fabric sweet spot (DDR5-6000 on AM5).
- Latency wins for high-FPS CPU-bound gaming and latency-sensitive work once bandwidth is adequate.
- Capacity and dual channel beat both: a single-channel ‘fast’ kit loses to a dual-channel ‘slower’ kit almost every time.
Buying rule of thumb
Pick the platform sweet-spot speed first (DDR4-3200/3600, DDR5-6000), then the lowest CL at that speed within your budget, then stop — gains beyond ~10ns kits are real but small, and prices climb fast. Worked examples: 6000 CL30 vs CL36.
Frequently asked questions
Is CL36 DDR5 worse than my old CL16 DDR4?
No. CL is measured in clock cycles, and DDR5 cycles are twice as fast. 6000 CL36 (12ns) is a little behind 3200 CL16 (10ns) in latency but far ahead in bandwidth — and platform differences dominate in practice.
Should I pay extra for CL30 over CL32 at 6000?
The difference is 0.67ns — measurable in benchmarks, invisible in use. Buy it if the price gap is small; don’t stretch a tight budget for it.