Crucial 16GB Single DDR4 2666 SODIMM for Mac

Crucial 16GB Single DDR4 2666 MT/s (PC4-21300) CL19 DR x8 SODIMM 260-Pin for Mac - CT16G4S266M

Crucial 16GB Single DDR4 2666 MT/s (PC4-21300) CL19 DR x8 SODIMM 260-Pin for Mac - CT16G4S266M

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  • Crucial 16GB Single DDR4 2666 MT/s (PC4-21300) CL19 DR x8 SODIMM 260-Pin for Mac - CT16G4S266M Type: 260-Pin DDR4 SO-DIMM Compatibility: For Apple iMac CAS Latency: 19 Voltage: 1.2V

Specifications Overview

Model CT16G4S266M
Type 260-pin DDR4 SODIMM
Speed DDR4-2666 MHz
Size 16GB (1 x 16GB)
CAS Latency 19
First Word Latency 14.25 ns
Voltage 1.2 V
Heat Spreader
ECC Support

RAM First Word Latency Table (nanoseconds)

Latency is measured in nanoseconds, which is a combination of frequency and CAS. Both frequency increases and latency decreases result in better system performance (when latency is the same, always prefer higher frequency if possible).

Frequency (MT/s)

2133 2400 2666 2800 2933 3000 3200 3300 3333 3400 3466 3600 3666 3733
13 12.19 10.83 9.75 9.29 8.86 8.67 8.13 7.88 7.80 7.65 7.50 7.22 7.09 6.96
14 13.13 11.67 10.50 10.00 9.55 9.33 8.75 8.48 8.40 8.24 8.08 7.78 7.64 7.50
15 14.06 12.50 11.25 10.71 10.23 10.00 9.38 9.09 9.00 8.82 8.66 8.33 8.18 8.04
16 15.00 13.33 12.00 11.43 10.91 10.67 10.00 9.70 9.60 9.41 9.23 8.89 8.73 8.57
17 15.94 14.17 12.75 12.14 11.59 11.33 10.63 10.30 10.20 10.00 9.81 9.44 9.27 9.11
18 16.88 15.00 13.50 12.86 12.27 12.00 11.25 10.91 10.80 10.59 10.39 10.00 9.82 9.64
19 17.82 15.83 14.25 13.57 12.96 12.67 11.88 11.52 11.40 11.18 10.96 10.56 10.37 10.18
20 18.75 16.67 15.00 14.29 13.64 13.33 12.50 12.12 12.00 11.76 11.54 11.11 10.91 10.72
21 19.69 17.50 15.75 15.00 14.32 14.00 13.13 12.73 12.60 12.35 12.12 11.67 11.46 11.25
22 20.63 18.33 16.50 15.71 15.00 14.67 13.75 13.33 13.20 12.94 12.69 12.22 12.00 11.79
23 21.57 19.17 17.25 16.43 15.68 15.33 14.38 13.94 13.80 13.53 13.27 12.78 12.55 12.32
24 22.50 20.00 18.00 17.14 16.37 16.00 15.00 14.55 14.40 14.12 13.85 13.33 13.09 12.86
25 23.44 20.83 18.75 17.86 17.05 16.67 15.63 15.15 15.00 14.71 14.43 13.89 13.64 13.39
CAS (clock cycles) Lower latency means faster memory.

Cheapest alternatives with equal or better performance

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