Crucial 4GB Single DDR4 2666 CT4G4DFS8266

Crucial 4GB Single DDR4 2666 MT/s (PC4-21300) CL19 x8 UDIMM 288-Pin - CT4G4DFS8266

Crucial 4GB Single DDR4 2666 MT/s (PC4-21300) CL19 x8 UDIMM 288-Pin - CT4G4DFS8266

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  • Crucial 4GB Single DDR4 2666 MT/s (PC4-21300) CL19 x8 UDIMM 288-Pin Memory - CT4G4DFS8266 CAS Latency: 19 Voltage: 1.20V Buffered/Registered: Unbuffered Features: Speeds up to 3200 MT/s and faster data rates are expected to be available as DDR4 technology matures Increase bandwidth by up to 32% Reduce power consumption by up to 40% Faster bursts access speeds for improved sequential data throughout Optimized for next generation processors and platforms

Specifications Overview

Model CT4G4DFS8266
Type 288-pin DIMM DDR4
Speed DDR4-2666 MHz
Size 4GB (1 x 4GB)
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

Same latency

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