The cheapest 4TB PCIe 4.0 SSD on Amazon has been tested ahead of Prime Day — and it reveals a worrying trend
Getting your hands on a 4TB SSD for just $158 ahead of Amazon Prime Day seems just too good to be true – but that’s exactly what you’ll get with the FanXiang S660, a high-capacity and low-cost NVMe PCIe 4.0 M.2 SSD.
Amazon Prime Day starts on October 10, with some of the best SSDs and fastest hard drives likely to be available at cut-price deals.
At 4TB, the S660 is one of the biggest consumer-grade SSDs you’ll find – as well as being the cheapest at $158. It’s certainly the most economical in terms of pure dollars per GB. Just prepare yourself for seriously sluggish performance, according to testing by Serve the Home.
The cheapest, and largest, SSD on the market
Its price makes the FanXiang S660 4TB the lowest-cost PCIe 4.0 4TB SSD on the market right now, beating the Silicon Power 4TB UD90 SSD by just $5. But these two are emblematic of a wider trend of cheaper high-capacity SSDs that just fail to live up to expectations, with performance nosediving.
The fastest SSDs out there, including the Samsung 980 Pro, tend to only be sold in variants up to 2TB, and they generally hit read/write speeds of 7,000MB/s. This is true for the Samsung for reads, with writes hitting roughly 5,000MB/s.
The fastest 4TB SSD we’ve seen, meanwhile, is the Crucial T700, which achieved reads of 12,400MB/s and writes of 11,800MB/s. But this will set you back $529.99 on Amazon at the time of writing.
The S660 4TB, by contrast, reached reads of 5,057MB/s – not bad – but writes of just 406MB/s, which is atrocious for an SSD. Serve the Home achieved these results on CrystalDiskMark.
The site corroborated this with additional results in ATTO – another benchmarking software. Here, the S660 hit reads of 6,738MB/s but writes of an abysmal 365MB/s. What’s worse is that writes drop to 180MB/s in further testing when the drive is filled to the 85% mark.
When browsing Prime Day on October 10 and 11, it’s important to be wary of how these drives perform in testing and real-world contexts – check out our guide to the best cheap SSD deals to make sure you get the best value and performance to boot.
More from TechRadar Pro
Getting your hands on a 4TB SSD for just $158 ahead of Amazon Prime Day seems just too good to be true – but that’s exactly what you’ll get with the FanXiang S660, a high-capacity and low-cost NVMe PCIe 4.0 M.2 SSD. Amazon Prime Day starts on October 10, with…
Recent Posts
- The Dyson HushJet Mini Cool is the powerful personal fan you won’t want to live without this summer — and it’s surprisingly reasonably priced, too
- Gone in 60 minutes
- GroWell Cap Review: I Have Hair for the First Time in 15 Years
- The Sonos Era 100 speaker is down to its lowest price in months
- Google shuts down the AI image app Pixel Studio
Archives
- June 2026
- May 2026
- April 2026
- March 2026
- February 2026
- January 2026
- December 2025
- November 2025
- October 2025
- September 2025
- August 2025
- July 2025
- June 2025
- May 2025
- April 2025
- March 2025
- February 2025
- January 2025
- December 2024
- November 2024
- October 2024
- September 2024
- August 2024
- July 2024
- June 2024
- May 2024
- April 2024
- March 2024
- February 2024
- January 2024
- December 2023
- November 2023
- October 2023
- September 2023
- August 2023
- July 2023
- June 2023