3 Reasons DDR4-2400 CL15 Beats DDR4-2666 CL19

Lower latency means faster response True latency is what matters, not just frequency. DDR4-2400 CL15 has 12.5 nanoseconds of latency, while DDR4-2666 CL19 has 14.25 nanoseconds. The “slower” kit actually responds faster to each request.

More capacity improves multitasking Going from 8GB to 16GB is a massive upgrade for multitasking. The used 2x8GB kit gives you double the memory without sacrificing speed.

Never mix different RAM kits Use the 2x8GB sticks alone. Mixing speeds forces everything to the slowest common denominator, which kills the latency advantage.