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RAM True Latency (ns) & Timings Calculator

Calculate true first-word memory latency in nanoseconds (ns), cycle times (tCK), and theoretical bandwidth across DDR4 and DDR5 memory kits.

Parameters & Controls

Select Benchmark Preset for Kit A

Kit A Configuration3200 MT/s — CL16

Speed (MT/s)

CAS Latency (CL)

tRCD

tRP

tRAS

Kit B Configuration3600 MT/s — CL18

Speed (MT/s)

CAS Latency (CL)

tRCD

tRP

tRAS

Telemetry Console & Results

64-bit IEEE 754

True Latency: Kit A vs Kit B

10 vs 10ns

Both kits deliver virtually identical first-word latency. Unless memory bandwidth is the priority, the cheaper kit represents better value.

Kit A Relative Access Speed vs Kit B100%

Detailed Mathematical Breakdown

First Word Latency: Kit A3200 MT/s CL16

10ns

First Word Latency: Kit B3600 MT/s CL18

10ns

Net Latency DeltaKit B is faster

0ns

Theoretical Bandwidth (Kit A)Dual-channel 128-bit bus

51.2GB/s

Theoretical Bandwidth (Kit B)Dual-channel 128-bit bus

57.6GB/s

Applied Equation (Live Input):

Latencia (ns) = (CL × 2000) ÷ MT/s = (16 × 2000) ÷ 3200 = 10 ns

Precalculated Engineering Configurations & Benchmarks

Direct access to high-intent hardware and game configurations with verified mathematical solutions:

DDR5-6000 CL30 vs DDR5-6400 CL32: True Latency (ns) Comparison

Technical memory showdown: DDR5-6000 CL30 vs DDR5-6400 CL32. Identical 10.00 ns first-word latency, bandwidth deltas and AMD Ryzen FCLK sync.

DDR4-3200 CL16 vs DDR4-3600 CL18: Latency (ns) Comparison

Compare DDR4-3200 CL16 vs DDR4-3600 CL18. Both offer identical 10.00 ns latency. 12.5% bandwidth advantage analysis for gaming.

Technical Methodology & Reference Guide

Many PC builders mistakenly assume that higher MT/s (Megatransfers/second) always translates to lower memory latency. In reality, memory access time is governed by clock cycle duration (tCK = 2000 / MT/s). While DDR5-6000 CL30 delivers an exact 10.00 ns first-word latency, a budget DDR5-5600 CL36 kit requires 12.85 ns (+28.5% slower access time).

Authoritative Standards & Scientific Documentation:

JEDEC Solid State Technology Association

JEDEC Standard JESD79-5 DDR5 SDRAM Specification

Formal mathematical specification for tCK, CAS latency cycles, and bank cycle times.

Micron Technology Inc.

Micron Technical Note: Measuring Memory Latency and Bandwidth in Modern DDR Systems

Correlation between true nanosecond latency and 1% low frametime pacing in gaming.