Crucial 8GB DDR5 4800MHz

Crucial 8GB DDR5 4800MHz CL40 CT8G48C40U5

Crucial 8GB DDR5 4800MHz CL40 CT8G48C40U5

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  • Harness blazing speeds at 4800MHz — 1.5x faster than DDR4
  • Game at higher frame rates and run demanding software with nearly 2x the bandwidth of DDR4
  • Empower your system for the next-generation multi-core CPUs
  • Intel XMP 3.0 enabled for easy performance recovery
  • ECC Type = Non-ECC, Form Factor = UDIMM, Pin Count = 288-pin, PC Speed = PC5-38400, Voltage = 1.1V

Specifications Overview

Model CT8G48C40U5
Release Date November 2021

* First availability for purchase, it may not correspond to the actual market launch date.

Type 288-pin DDR5 DIMM
Speed DDR5-4800 MHz
Size 8GB (1 x 8GB)
CAS Latency 40
First Word Latency 16.66 ns
Voltage 1.1 V
Heat Spreader No
ECC Support No

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)

4400 4800 5000 5200 5600 6000 6200 6400 6600 6800 7000 7200 7400 7600
36 16.36 15.00 14.40 13.85 12.86 12.00 11.61 11.25 10.91 10.59 10.29 10.00 9.73 9.47
37 16.82 15.42 14.80 14.23 13.21 12.33 11.94 11.56 11.21 10.88 10.57 10.28 10.00 9.74
38 17.27 15.83 15.20 14.62 13.57 12.67 12.26 11.88 11.52 11.18 10.86 10.56 10.27 10.00
39 17.73 16.25 15.60 15.00 13.93 13.00 12.58 12.19 11.82 11.47 11.14 10.83 10.54 10.26
40 18.18 16.67 16.00 15.38 14.29 13.33 12.90 12.50 12.12 11.76 11.43 11.11 10.81 10.53
41 18.64 17.08 16.40 15.77 14.64 13.67 13.23 12.81 12.42 12.06 11.71 11.39 11.08 10.79
42 19.09 17.50 16.80 16.15 15.00 14.00 13.55 13.13 12.73 12.35 12.00 11.67 11.35 11.05
43 19.55 17.92 17.20 16.54 15.36 14.33 13.87 13.44 13.03 12.65 12.29 11.94 11.62 11.32
44 20.00 18.33 17.60 16.92 15.71 14.67 14.19 13.75 13.33 12.94 12.57 12.22 11.89 11.58
45 20.45 18.75 18.00 17.31 16.07 15.00 14.52 14.06 13.64 13.24 12.86 12.50 12.16 11.84
46 20.91 19.17 18.40 17.69 16.43 15.33 14.84 14.38 13.94 13.53 13.14 12.78 12.43 12.11
47 21.36 19.58 18.80 18.08 16.79 15.67 15.16 14.69 14.24 13.82 13.43 13.06 12.70 12.37
48 21.82 20.00 19.20 18.46 17.14 16.00 15.48 15.00 14.55 14.12 13.71 13.33 12.97 12.63
49 22.27 20.42 19.60 18.85 17.50 16.33 15.81 15.31 14.85 14.41 14.00 13.61 13.24 12.89
50 22.73 20.83 20.00 19.23 17.86 16.67 16.13 15.63 15.15 14.71 14.29 13.89 13.51 13.16
51 23.18 21.25 20.40 19.62 18.21 17.00 16.45 15.94 15.45 15.00 14.57 14.17 13.78 13.42
52 23.64 21.67 20.80 20.00 18.57 17.33 16.77 16.25 15.76 15.29 14.86 14.44 14.05 13.68
CAS (clock cycles) Lower latency means faster memory.

Distribution of First Word Latencies for Similar RAM Modules

The histogram below shows the distribution of first word latencies (in nanoseconds) for all RAM modules of the same DDR type and frequency in our database. Each bar represents the number of modules that fall within a specific latency range. The highlighted bar indicates the latency of the currently selected RAM module.

Cheapest alternatives with equal or better performance

-0.24ns Latency

-1.28ns Latency

-2.38ns Latency


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