Fanxiang S800 4TB: large budget Gen4 storage (2026)
The Fanxiang S800 4 TB is the largest, most durable drive in Fanxiang's budget Gen4 line, rated at up to 7,300 MB/s reads with YMTC 232-layer TLC and a generous 2,800 TBW endurance figure.
Controller & Memory
Fanxiang is a Chinese budget brand that sells affordable SSDs, and the S800 4 TB is the top capacity of its mainstream PCIe 4.0 line. It pairs Maxio's MAP1602 controller with YMTC (Yangtze Memory) 232-layer 3D TLC NAND and no DRAM, using the Host Memory Buffer to hold the flash translation layer in system RAM. Rated at 7,300 MB/s sequential reads and 6,800 MB/s writes over PCIe 4.0 x4, it delivers the same peak bandwidth as the smaller models with far more room.
The S800 ships in 1 TB, 2 TB, and 4 TB. The 4 TB is the capacity and endurance flagship, carrying a 2,800 TBW rating, double the 2 TB's 1,400 TBW and four times the 1 TB's 700 TBW. It is a standard M.2 2280 module, though at 4 TB it is typically double-sided, so it may not fit ultra-thin laptops with no clearance above the slot, while dropping into any desktop with standard M.2 room.
As a DRAM-less design, the S800 leans on its SLC cache to reach its rated write speed, and the 4 TB's large cache absorbs very long sustained transfers before writes settle to the native TLC rate. For a large game library, a project archive, or a scratch disk, the 4 TB S800 offers a rare combination of PCIe 4.0 bandwidth, huge capacity, and 2,800 TBW of endurance at budget pricing. It is one of the more affordable ways to get multi-terabyte Gen4 storage.
Storage Comparisons:
S800 Performance & Benchmarks
The S800 4 TB is rated at 7,300 MB/s sequential reads and 6,800 MB/s writes over PCIe 4.0, figures shared across the line. No reliable random-IOPS figure is published for the drive, and the manufacturer rates the same peak throughput across all capacities.
Fanxiang S800 4 TB vs M.2 4.0 x 4 peers
Switch between sequential throughput and random IOPS to see how this drive stacks up against other M.2 4.0 x 4 SSDs in our database. The highlighted bar is the drive on this page — click any other bar to open that drive.
- Patriot Viper PV593 1 TB: 14,500 MB/s read, 14,000 MB/s write
- Patriot Viper PV593 2 TB: 14,500 MB/s read, 14,000 MB/s write
- Patriot Viper PV593 4 TB: 14,500 MB/s read, 14,000 MB/s write
- Patriot Viper PV573 2 TB: 14,000 MB/s read, 12,000 MB/s write
- Fanxiang S800 4 TB (this drive): 7,300 MB/s read, 6,800 MB/s write
Real-world results trail the rating, as is typical for budget DRAM-less drives on the Maxio MAP1602 platform. Writes run at full speed inside the SLC cache until it fills, then settle to the native TLC rate; the 4 TB's large cache absorbs the longest sustained transfers of the line before slowing. Reads, by contrast, stay close to the rating in everyday use.
For gaming and everyday use the difference is hard to notice. Game load times are bounded by the CPU and asset decompression once a drive clears about 3,000 MB/s, so the S800 feels as quick as a faster-rated drive in practice. The 4 TB's advantage is capacity and write headroom, holding a massive game library or media archive on one drive. Large sustained transfers and heavy write workloads are where the budget DRAM-less design shows; for a storage-heavy build that rarely matters. It runs cool enough under light use, though sustained writes benefit from a motherboard heatsink.
Fanxiang S800 vs Competitors
See how the S800 stacks up against other M.2 4.0 x 4 drives in our database:
Compare with rival drives:
Endurance, TBW & Warranty
Fanxiang covers the S800 4 TB with a five-year limited warranty, a strong term for a budget drive. Endurance is rated at 2,800 TBW on this model, the highest in the line, which at a heavy 100 GB per day of writes equates to roughly 77 years, so the flash will outlast the warranty in any realistic workload. The rating scales with capacity, from 700 TBW on the 1 TB through 1,400 TBW on the 2 TB up to this 2,800 TBW figure, which johnnylucky corroborates for the line at 2.8 PBW. Fanxiang rates the drive at around 2 million hours MTBF, a population statistic describing expected failures across a fleet rather than a guarantee for any single unit. Returns are handled through the retailer or Fanxiang depending on region, and the drive ships without a heatsink, so motherboard M.2 cooling is recommended.
Fanxiang S800 4 TB Specifications
| Category | Value |
|---|---|
| Capacity [?] | 4 TB |
| Interface [?] | M.2 4.0 x 4 |
| Controller [?] | Maxio MAP1602 |
| Memory type [?] | YMTC 232-L TLC |
| DRAM [?] | No |
| Read speed (MB/s) [?] | 7300 |
| Write speed (MB/s) [?] | 6800 |
| Read IOPS [?] | n/a |
| Write IOPS [?] | n/a |
| Endurance (TBW) [?] | 2800 |
| MTBF (million hours) [?] | 2000000 |
| Warranty (years) [?] | 5 |
Verdict: Is the S800 Worth It in 2026?
Buy the Fanxiang S800 4 TB for a budget build that needs a large game library, media archive, or project cache on a single PCIe 4.0 drive, with 2,800 TBW of endurance and a five-year warranty for well under flagship money. Skip it when only a fast boot drive is needed, since the 1 TB or 2 TB is more than enough and the 4 TB's double-sided PCB may not fit thin laptops, or when brand familiarity matters, where the Crucial P310 4 TB is the safer pick. The natural rivals are the Crucial P310 4 TB and Crucial P3 4 TB, both budget options. We rate the 4 TB S800 a reasonable large-capacity value drive for bulk storage and archives on a budget.
+ Pros
- 4 TB capacity on a budget Gen4 drive
- Up to 7,300 MB/s rated reads
- YMTC 232-layer TLC NAND
- 2,800 TBW endurance rating
- Five-year limited warranty term
- Large SLC cache absorbs long sustained writes
- Cons
- DRAM-less; real-world writes trail the rating
- Double-sided PCB may not fit thin laptops
- Budget brand, limited review coverage
- No published random-IOPS figure
Buy this or similar SSD Storage:
Video Review
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