ADATA XPG Gammix S40G
Expert rating6.5 / 10
- Model:
- ADATA XPG Gammix S40G
- Interface:
- PCIe 4.0
- Sequential Read:
- Up to 3
- Heatsink Option:
- Included
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Manufacturer: ADATA Last updated: September 12, 2026
ADATA XPG Gammix S40G (PCIe 4.0 NVMe/3,500 MB/s Read/Early Gen4 Value Option) Review
The ADATA XPG Gammix S40G was one of the earliest PCIe 4.0 NVMe drives to market, and its Gen 3-class controller means it never actually saturates a Gen 4 link, landing its real-world speed closer to a fast PCIe 3.0 drive.
That makes it an odd product on paper but a sensible budget pick in practice, it's PCIe 4.0 compatible for future-proofing on a Gen 4 motherboard while pricing like the value-tier drive its actual throughput reflects.
Performance and Speed
3,500 MB/s read and 3,000 MB/s write are well below what a modern PCIe 4.0 drive can hit, effectively performance-matching a good PCIe 3.0 drive despite the Gen 4-rated interface, a quirk of its early Gen 4 controller generation.
Why the Numbers Look Low for PCIe 4.0
This drive predates the current generation of PCIe 4.0 controllers that push past 7,000 MB/s, so buyers should treat it as a budget-tier drive that happens to be PCIe 4.0 compatible rather than a performance option, useful mainly for interface compatibility on newer boards at a lower price.
Comparison to Sibling Products
Against the ADATA XPG Gammix S50 Lite, also covered on this site, the S50 Lite uses a newer controller generation and delivers meaningfully higher throughput for a similar price, making it the better buy in most cases. Against the ADATA XPG SX8200 Pro, a PCIe 3.0 drive also covered on this site, the actual real-world performance difference is small despite the different generation labels.
Who This SSD Is Actually For
Budget builders on a new PCIe 4.0 motherboard who want interface compatibility without paying for real Gen 4 speed. This drive fills that specific niche.
Secondary storage drives where cost matters more than throughput. The modest speed is plenty for file storage and less demanding tasks.
Not for anyone who specifically wants PCIe 4.0-class performance. ADATA's own Gammix S50 Lite, covered elsewhere on this site, delivers that at a similar price.
Specifications
Identity
| Brand | ADATA |
|---|---|
| Model Number | Gammix S40G |
| Series | XPG Gammix S40G |
Interface and form
| Bus Interface | PCIe 4.0 x4, NVMe |
|---|
Sequential performance
| Sequential Read | 3500 MB/s |
|---|---|
| Sequential Write | 3000 MB/s |
NAND
| NAND Type | TLC with DRAM Cache |
|---|
Power and thermals
| Heatsink | Included |
|---|
Physical and commercial
| Warranty | 5 Years |
|---|
| Capacity Options | 500GB, 1TB, 2TB |
|---|
Expert Review
Reviewed by Burooj Alam. Rated by us, not by users.
Expert rating6.5 / 10
PCIe 4.0 compatible in name only; treat it as a budget PCIe 3.0-class drive and price-shop it accordingly.
Best for
- Budget builders on a new PCIe 4.0 motherboard who want interface compatibility without paying for real Gen 4 speed.
- Secondary storage drives where cost matters more than throughput. The modest speed is plenty for file storage and less demanding tasks.
- Buyers specifically comparing older Gen 4 SKUs on clearance pricing.
Not for
- Not for anyone who specifically wants PCIe 4.0-class performance. ADATA's own Gammix S50 Lite, covered elsewhere on this site, delivers that at a similar price.
- Not for gaming builds prioritizing fast load times; the throughput here doesn't clear the PCIe 3.0 tier by much.
- Not for content creators regularly moving large files, where the low ceiling becomes a real bottleneck.
FAQs
What are the key specifications of the ADATA XPG Gammix S40G (PCIe 4.0 NVMe/3,500 MB/s Read/Early Gen4 Value Option)?
The ADATA XPG Gammix S40G (PCIe 4.0 NVMe/3,500 MB/s Read/Early Gen4 Value Option) is a component from ADATA. Key specs: Interface PCIe 4.0 x4, NVMe, Sequential Read 3500, Sequential Write 3000, NAND Type TLC with DRAM Cache, Capacity Options 500GB, 1TB, 2TB.
Who is the ADATA XPG Gammix S40G (PCIe 4.0 NVMe/3,500 MB/s Read/Early Gen4 Value Option) best suited to?
It suits budget builders on a new pcie 4.0 motherboard who want interface compatibility without paying for real gen 4 speed., secondary storage drives where cost matters more than throughput. the modest speed is plenty for file storage and less demanding tasks., buyers specifically comparing older gen 4 skus on clearance pricing..
What are the drawbacks of the ADATA XPG Gammix S40G (PCIe 4.0 NVMe/3,500 MB/s Read/Early Gen4 Value Option)?
It is a poor fit for not for anyone who specifically wants pcie 4.0-class performance. adata's own gammix s50 lite, covered elsewhere on this site, delivers that at a similar price., not for gaming builds prioritizing fast load times; the throughput here doesn't clear the pcie 3.0 tier by much., not for content creators regularly moving large files, where the low ceiling becomes a real bottleneck..
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