Before Prime Day, we put Amazon’s least expensive 4TB PCIe 4.0 SSD to the test, and the results weren’t good.
The FanXiang S660 is a high-capacity and low-cost NVMe PCIe 4.0 M.2 SSD, and getting your hands on one for just $158 before Amazon Prime Day seems too good to be true.
The best solid-state drives (SSDs) and quickest hard drives (HDDs) could be available at steep discounts on Amazon Prime Day, which begins on October 10. The S660 is one of the largest consumer-grade SSDs available at 4TB, yet it’s also one of the cheapest at $158. Dollar for dollar, it’s the cheapest option per megabyte. Serve the Home’s testing suggests you should anticipate extremely slow performance.
The largest and least expensive solid-state drive available

The FanXiang S660 4TB is currently the most cost-effective PCIe 4.0 4TB SSD available, undercutting the Silicon Power 4TB UD90 SSD by $5. These two, however, are representative of a larger trend toward inexpensive, high-capacity SSDs that fall far short of expectations in terms of performance.
The fastest available solid-state drives (SSDs), including the Samsung 980 Pro, are often only available in capacities as large as 2 terabytes (TB), with read/write rates of up to 7,000 MB per second. For reads, this is accurate for the Samsung, but write speeds top out at around 5,000MB/s.
Meanwhile, the Crucial T700 is the fastest 4TB SSD we’ve encountered, with read speeds of 12,400MB/s and write speeds of 11,800MB/s. However, the price at the time of this writing on Amazon is a hefty $529.99.
In contrast, the S660 4TB managed read speeds of 5,057MB/s (not bad) but writes of just 406MB/s (worst for an SSD). Using CrystalDiskMark, Serve the Home was able to reach these results.
The site’s ATTO results, another benchmarking tool, confirmed these findings. Here, the S660 achieves a peak of 6,738MB/s during reading and a pitiful 365MB/s during writing. Further testing shows that when the drive is 85% full, write speeds drop to 180MB/s.
Be aware of the performance of these drives in testing and real-world scenarios as you shop on Prime Day, October 10 and 11, and consult our guide to the top cheap SSD offers to ensure you get the greatest value and performance possible.
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