Fanxiang S660: Specs, Cache Type and Live Prices

ServeTheHome teardown read 15 September 2026. Prices and counts last refreshed 2026-09-15

What's inside - one unit, one date

ServeTheHome tore down an S660 4TB unit and published its findings on 1 October 2023. That is the scope of what follows: a teardown documents the specific unit tested on that date, not a guarantee that every S660 sold since carries the same parts. With that scope stated plainly, here is what they found.

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

This is line-level context, not a claim about Fanxiang's wider range: the S770 and S880 models ServeTheHome has separately torn down use different controllers (Innogrit and Maxio respectively) and different NAND (both YMTC). The S660 specifically pairs a Phison controller with Micron NAND - a different combination from either sibling.

Spec table

Fanxiang's own product page for the S660 could not be read this session - the vendor domain returned a DNS resolution failure on every rendered attempt (not a 403 or a deliberate block; see the Fanxiang brand page for the full account). The table below is sourced from ServeTheHome's review instead, which is a press/teardown source rather than the vendor's own page - flagged here rather than presented as if it came from Fanxiang directly.

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

Live listings

Every S660 listing our tracker currently identifies from its verified title and shows as purchasable, cheapest per GB first.

Warranty

This is one data point inside a wider pattern - Fanxiang's own product pages elsewhere state a “3-5 Year Warranty” range rather than a flat figure, per Trustpilot reviewers quoting that wording directly. See the Fanxiang brand page's warranty section for the full, sourced discrepancy rather than a re-derivation here.

PS5 fit

Fanxiang markets the S660 as PS5-compatible and ships every capacity with an integrated heatsink. Sony publishes its own requirement for a PS5 M.2 expansion drive - PCIe Gen4 x4 NVMe, a sequential read floor of 5,500MB/s, a heat-dissipating structure, and a physical size within the console's expansion bay - on Sony's own support page. We render no compatibility verdict of our own here; see our PS5 SSD compatibility page for the full requirement breakdown against every Sony-published field.

The heatsink is worth a second look rather than a checkbox, because Sony's requirement is functional (a heat-dissipating structure) rather than a specific approved part. Every S660 listing we track ships the heatsink pre-fitted rather than as a separate accessory, so there is no bare-drive variant of this specific model in our catalogue to weigh against a standalone heatsink purchase - unlike some other brands in our PS5 SSD Fanxiang cluster page, where that bare-versus-fitted arithmetic does apply to other capacities and other lines.

Why the S660 specifically

The S660 is the model we could source in depth for a reason worth stating plainly: it is the one Fanxiang line whose listing titles consistently name the model, which is what let Part 0's identification gate tie four separate catalogue rows to it with confidence. The S880R and S790R each have exactly one identified listing in our catalogue - short of the two-rows-or-sourced-vendor-page threshold that gate requires before a model earns its own page - so they remain covered only on the main Fanxiang brand page rather than getting the same per-model depth this page has.

That asymmetry is a property of what we could verify, not a claim that the S660 is Fanxiang's flagship line - ServeTheHome's own review closes by naming capacity per dollar specifically as the S660's strength: “This drive has two things going for it; it is big and it is cheap. If capacity per dollar is your benchmark, then the Fanxiang S660 should be a drive to look at.” We report what we can source, and for Fanxiang's current PS5 range, the model we could source in depth happens to be the one the reviewer himself frames as the value option rather than the top of the line.

What a careful buyer checks on this model specifically

Because the S660 has no DRAM cache and relies on dynamic SLC caching, the useful check after a large install is not just a SMART read but watching what happens once you exceed the SLC buffer - a long, sustained write large enough to fill it will fall back to the NAND's native write rate, which is documented, expected behaviour for this architecture rather than a fault. Confirm the reported capacity in Windows or on the PS5 matches what you paid for, and keep the purchase record for the length of whichever warranty term applies to your specific unit - see the warranty section above for why that term is not settled by a single confident number.

More: Fanxiang brand page · DRAM cache vs DRAM-less, explained · vs Samsung 990 PRO · vs WD SN850X · Fanxiang in the PS5 SSD cluster