Output
Nanoseconds
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RAM Latency Calculator
Convert CAS latency and memory data rate into first-word latency.
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RAM Latency Calculator · At a glance
Quick answer: Convert CAS latency and memory data rate into first-word latency. CL16 at 3200 MT/s and CL30 at 6000 MT/s both give 10 ns for the CAS component.
RAM Latency Calculator
The test loads when you open it. Device access is requested only after you choose to start.
Detailed guide
How to use this tool
- Enter CAS latency and the advertised data rate in MT/s.
- Use the effective transfer rate rather than half-rate memory clock.
Input
Values and units entered in the calculator
Browser requirement
Local arithmetic; no hardware access
Processing
Runs on your device; no tool-result upload
How it works and what the result means
The result is a mathematical estimate under the stated formula. It does not read your hardware or change system settings.
Reading the result
CL16 at 3200 MT/s and CL30 at 6000 MT/s both give 10 ns for the CAS component. This is not complete memory access latency.
Worked example and assumptions
first-word latency (ns) = CAS latency × 2000 ÷ data rate (MT/s)
CL16 at 3200 MT/s gives 10 ns. CL30 at 6000 MT/s also gives 10 ns.
This isolates CAS timing and excludes controller, cache and other access delays.
CL16 at 3200 MT/s gives 10 ns. CL30 at 6000 MT/s also gives 10 ns.
This isolates CAS timing and excludes controller, cache and other access delays.
What to check next
Do not enter 1600 MHz as 3200 MT/s by accident. Check which unit your monitoring tool displays.
Keep consistent units and compare the assumptions with your actual game, display or network configuration.
Frequently asked questions
Does equal calculated latency mean equal RAM performance?
No. Bandwidth, other timings, controller behavior and workload also matter. The result isolates the stated CAS timing component.
How do I start the RAM Latency Calculator?
Enter your own values and press Calculate. Units are shown beside each field; invalid or impossible values are rejected.
Does this tool require a download or an account?
No. Open the interactive tool above in a modern browser. The instructions and explanations are available even with JavaScript disabled; running a test needs JavaScript.
Will this change my device or game settings?
No. The calculator or generator only creates a result for you to review. It does not detect or modify your hardware, operating system or game configuration.
Why can another calculator show a different answer?
Compare the units, rounding and assumptions. The same inputs and formula give the same result here; background CPU load does not change the mathematics.