Convert any kit’s CAS latency and speed into true latency in nanoseconds — and compare two kits head to head.
Updated 11 Nov 2026 · 2 min read
Quick answer
True latency (ns) = CAS latency × 2000 ÷ speed in MT/s. Enter one kit for its latency, or two to see which is genuinely faster — the result most spec sheets hide.
RAM Latency Calculator
Convert any kit's CAS latency and speed into true latency in nanoseconds — and compare two kits head to head.
Why nanoseconds are the honest unit
CAS latency is counted in clock cycles, and cycles get shorter as speed rises. That is why DDR5-6000 CL30 (10.0ns) is not ‘twice as slow’ as DDR4-3000 CL15 (also 10.0ns). Always convert before comparing across speeds or generations. More: latency vs frequency.
Frequently asked questions
What is a good latency figure?
Around 10ns is the mainstream sweet spot for both DDR4 and DDR5 gaming kits. Under 9ns is enthusiast territory; above 12ns suggests a budget/JEDEC kit.
Does latency matter more than bandwidth?
For gaming, once bandwidth is adequate, latency usually matters more — but capacity and dual channel outrank both. The calculator’s comparison shows the latency half of the story.