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2026-05-06 12:10:17 CAS Latency (CL) Explained: How DDR5 Timings Affect Real-World Performance
Memory timings are nearly as important as frequency. Lower timings reduce latency and improve system responsiveness.
1. What Timings Mean
CL (CAS Latency) is the most critical timing parameter, representing the delay (in clock cycles) between a read command and when data becomes available. Other timings include tRCD, tRP, and tRAS. DDR5 frequencies are higher, so CL values are also higher. DDR4 3200 typically has CL14-16; DDR5 6000 typically has CL28-36.
2. Calculating True Latency
True latency (nanoseconds) = CL × 2000 ÷ Frequency (MHz)
Examples:
DDR4 3200 CL16: 16 × 2000 ÷ 3200 = 10.0ns
DDR5 6000 CL30: 30 × 2000 ÷ 6000 = 10.0ns
DDR5 8000 CL38: 38 × 2000 ÷ 8000 = 9.5ns
High frequency with high CL may have similar or worse true latency than lower frequency with lower CL.
3. Performance Impact of Timings
Lower CL primarily benefits random access, gaming frame rates, and application responsiveness. For gamers, 6000 CL28-30 is often preferable to 6400 CL36.
4. Selection Advice by Use Case
Gamers: Prioritize lower CL timings over raw frequency
Productivity (rendering, compression): Bandwidth from higher frequency often matters more than timings
Overclockers: Look for kits with known good ICs (Hynix A/M-die, Samsung B-die)
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