Two RAM kits sit on the shelf: one is DDR5-6000 with a CAS latency of CL30, the other is DDR5-7200 at CL36. The second has a higher MHz number — but is it actually faster? This is one of the most misunderstood questions in PC building, and the answer comes down to a simple piece of maths most people never see. Once you understand "true latency," you'll never be fooled by a big MHz number on the box again — and you'll understand why DDR5-6000 CL30 is so often the recommended kit.
This is the theory behind our DDR5 sweet-spot guide.
Frequency and Latency Are Two Halves
- Frequency (MHz): how many transfers the memory does per second — the "speed" number. Higher means more bandwidth.
- Latency (CL / timings): how many clock cycles the memory waits before responding — lower is better. The CL number is the headline timing.
- The catch: faster kits often have higher CL numbers (looser timings), so a big MHz number can come with more waiting. You have to weigh both.
The "True Latency" Maths
Here's the simple formula that cuts through it. The actual delay (in nanoseconds) is the CL number divided by the frequency (then scaled):
- True latency ≈ (CL ÷ frequency) — the lower the result, the less real waiting.
- DDR5-6000 CL30 and DDR5-7200 CL36 work out to roughly the same true latency — the higher MHz of the 7200 kit is offset by its looser CL36 timing.
- So a higher MHz number doesn't automatically mean faster response — you must factor in the timings. This is why CL matters as much as the speed.
(The maths is the same idea that makes DDR5-6000 CL30 comparable in effective latency to good DDR4 — covered in our DDR generations comparison.)
Why 6000 CL30 Often Wins Anyway
If true latency is similar, why prefer 6000 CL30 over 7200 CL36? Two reasons: on AM5 the 6000 kit runs at the efficient 1:1 memory controller ratio (the 7200 kit often can't), and it's usually cheaper. So you get equal-or-better real-world performance for less money — the definition of a sweet spot. Bandwidth from higher MHz helps some specific workloads, but for gaming and general use, the balanced 6000 CL30 kit is the smart buy on AMD.
The Nigeria Tax
Don't pay a premium for a big MHz number that looser timings cancel out — that's wasted naira. Use the true-latency idea to compare kits honestly: a cheaper 6000 CL30 kit that matches a pricier 7200 CL36 kit in effective latency (and runs better on AM5) is the obvious choice. Buy on the balance of frequency and timings, not the headline number, and put the savings elsewhere in the build.
Frequently Asked Questions
Is higher MHz RAM always faster? No — faster kits often have looser timings (higher CL), so the real response time can be similar. "True latency" (CL ÷ frequency) tells the real story; a big MHz number with loose timings isn't automatically faster.
Is DDR5-6000 CL30 or DDR5-7200 CL36 better? They have roughly the same true latency, but 6000 CL30 runs at AM5's efficient 1:1 ratio and usually costs less — making it the better real-world buy on AMD. On Intel, the higher bandwidth of 7200 can help.
What matters more, frequency or latency? Both — they combine into effective latency, and you should weigh them together rather than chasing one number. The balanced kit (good frequency, tight timings) at your platform's sweet spot wins.
The One Thing to Remember
A big MHz number means little on its own — what matters is true latency (CL ÷ frequency), and faster kits often have looser timings that cancel out the speed. DDR5-6000 CL30 and DDR5-7200 CL36 have similar effective latency, but the 6000 kit runs better on AM5 and costs less. Compare kits on the balance of frequency and timings, not the headline, and don't overpay for MHz that timings erase.
Choosing memory? Configure a build online → or talk to our team → and we'll pick the kit with the best real-world latency for your platform — not just the biggest number.