Fanxiang vs Samsung 990 PRO: Price, Cache and Warranty, Sourced

Prices last refreshed 2026-09-16. Vendor documents read 15 September 2026.

The $/GB gap, matched by capacity

Computed live, at each capacity where we currently hold in-stock listings on both sides - never a cross-capacity headline, because comparing a cheap small drive against an expensive large one measures the capacity mix rather than the brand.

Positive means Samsung costs more per GB than Fanxiang at that capacity. Capacities held on only one side are not shown: Fanxiang only at 0.5TB.

Live listings at each matched capacity

The exact in-stock listing behind each cell above, cheapest per GB on each side at that capacity.

Cache architecture, both sides sourced

This is the specification difference that best explains the price gap above, and it is sourced from each maker's own documentation rather than inferred from the price itself.

Press, attributed Fanxiang S660 teardown from Fanxiang S660 4TB PCIe Gen4 NVMe SSD Review, ServeTheHome (Will Taillac, 1 October 2023). Read 15 September 2026.

Company's own words Samsung 990 PRO specification from Samsung V-NAND SSD 990 PRO Data Sheet, Revision 2.0, Samsung Electronics Co., Ltd (official PDF datasheet). Read 15 September 2026.

The S660's finding is a single tested unit at one date, per ServeTheHome's review published 1 October 2023 - not a guarantee every unit sold under that name since carries identical parts. Samsung's datasheet is the vendor's own current published specification, revision 2.0, July 2023.

Warranty and endurance, both sides quoted

The nominal term matches at 5 years on both sides. What differs is the confidence behind the figure: Samsung's is the vendor's own current published datasheet; the Fanxiang figure comes from a reviewer reading it off a physical box, with the reviewer's own note that it was not corroborated on Fanxiang's website. See the Fanxiang brand page for the fuller warranty picture, including Trustpilot-quoted evidence that Fanxiang's own product pages advertise a “3-5 Year Warranty” range rather than a flat figure.

Advertised performance - maker claims, not our measurement

Samsung's datasheet states up to 7,450MB/s sequential read and 6,900MB/s sequential write for the 990 PRO (maker claim). Fanxiang's S660 listings advertise up to 5,000MB/s sequential read (maker claim). We do not test drives, we publish no benchmark figures of our own, and we make no comparative performance statement about either drive in practice - both numbers above are exactly what each party has published, nothing more.

Both figures sit well above Sony's published PS5 requirement of 5,500MB/s sequential read, so both meet the platform's floor on paper. The console does not reward exceeding that floor - our cheapest PS5 SSD ranking treats the requirement as a threshold rather than a leaderboard for exactly this reason, and this comparison applies the same logic: neither drive's advertised headroom above Sony's minimum is a reason to pay more for a console-only build, whatever it might mean in a general-purpose PC.

What each drive is actually built from

Put the sourced facts side by side without smoothing them into a single takeaway: Samsung designs its own controller and fabricates its own NAND in-house, a level of vertical integration few consumer SSD makers have, and states that explicitly in its own datasheet for every capacity of the 990 PRO. Fanxiang, per ServeTheHome's teardown, sources a Phison controller and Micron NAND for the S660 - both established component makers in their own right, assembled by a brand that does not manufacture either part itself. Neither structure is inherently better; they are different positions in the supply chain, and the price difference above is one visible consequence of that difference, not the whole explanation for it.

Who each side's published terms suit

Samsung's own documentation states a DRAM cache, the higher TBW ceiling, and a warranty term corroborated on the vendor's own current datasheet - specifications that suit a buyer who wants the sourcing confidence to match the price. Fanxiang's S660 costs less per GB at every matched capacity and meets Sony's published PS5 requirement on paper, at the cost of a warranty term whose only source is a reviewer's photograph of a box rather than the vendor's current site. Which published terms suit you is a question this page can inform with sourced numbers; it is not one we are answering on either drive's behalf.

More: Fanxiang S660 page · DRAM cache vs DRAM-less, explained · Fanxiang vs WD SN850X · Fanxiang vs Fikwot