Crucial CT8G48C40U5.M4A1 8GB
- Capacity:
- 8GB
- DDR Generation:
- DDR5
- Speed:
- 4800MT/s
- CAS Latency:
- CL40
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Manufacturer: Crucial Last updated: 2026-09-14
Crucial CT8G48C40U5.M4A1 8GB Review
The Crucial CT8G48C40U5.M4A1 is an 8GB DDR5-4800 desktop module, Crucial's plain bare-label memory line at DDR5's entry-level JEDEC speed.
We wouldn't build a new PC around 8GB in 2026, but this is a fine cheap way to add a second stick to an existing single-module system or fill a spare slot for light desktop use.
Performance
4800MT/s CL40 is DDR5's baseline JEDEC speed, true latency lands around 16.7ns with no XMP profile to speed it up. At 8GB capacity this is squarely an entry-level or supplementary module rather than a primary kit.
Comparison to Alternatives
Crucial's own Basics line covers the same 8GB/16GB entry tier under the CB-prefix naming (e.g. Crucial Basics CB16GU4800 at 16GB, same 4800MT/s CL40 spec) if you want a full single-stick build instead of an 8GB add-on. For a step up in speed at the same capacity, Crucial's CT8G56C46U5 line runs 5600MT/s instead.
Specifications
Identity
| Brand | Crucial |
|---|---|
| Part Number | CT8G48C40U5.M4A1 |
| Series | Crucial RAM |
Memory
| DDR Generation | DDR5 |
|---|---|
| Capacity | 8 GB |
| Speed | 4800 MT/s |
| CAS Latency | 40 |
| Module Count | 1 |
| Voltage | 1.1 V |
Physical
| Form Factor | Desktop DIMM |
|---|---|
| RGB Lighting | No |
Module and platform
| RAM Segment | Desktop DDR5 |
|---|
Capacity
| Capacity Per Module | 8 GB |
|---|
Speed and timings
| True Latency | 16.7 ns |
|---|
Silicon
| Memory IC | Micron |
|---|---|
| ECC | No |
Physical and lighting
| Colour | Green PCB |
|---|
Commercial
| Warranty | Limited Lifetime |
|---|
| Model Number | CT8G48C40U5.M4A1 |
|---|---|
| OC Profile | JEDEC Standard (No XMP) |
| Spec Score | 3.2 |
Expert Review
Reviewed by Burooj Alam. Rated by us, not by users.
Best for
- Adding a second 8GB stick to an existing single-module PC
- Basic office or light desktop use where 8GB is enough
- Budget pre-built upgrades
Not for
- New gaming or content-creation builds (too little capacity)
- Buyers wanting XMP-tuned speeds
FAQs
What are the key specifications of the Crucial CT8G48C40U5.M4A1 8GB?
The Crucial CT8G48C40U5.M4A1 8GB is a memory kit from Crucial. Key specs: DDR Generation DDR5, Capacity 8GB, Speed 4800MT/s, CAS Latency 40, Module Count 1.
Will the Crucial CT8G48C40U5.M4A1 8GB work with my current setup?
The Crucial CT8G48C40U5.M4A1 8GB lists DDR Generation is DDR5. Check that against the hardware you already own before buying, since this is the field that most often decides whether a part fits. Our upgrade checker at /upgrade can confirm compatibility for common combinations.
Who is the Crucial CT8G48C40U5.M4A1 8GB best suited to?
It suits adding a second 8gb stick to an existing single-module pc, basic office or light desktop use where 8gb is enough, budget pre-built upgrades.
What are the drawbacks of the Crucial CT8G48C40U5.M4A1 8GB?
It is a poor fit for new gaming or content-creation builds (too little capacity), buyers wanting xmp-tuned speeds.