QNAP TS-351

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Status: Legacy / discontinued

A 3-bay NAS for home and small office use from 2018, with a dual-core Intel Celeron and two M.2 NVMe slots for SSD caching. It supports RAID 5 across its three bays and has HDMI output. The catch is that only one bay runs at full SATA 6Gb/s, networking is a single Gigabit port, and there's no PCIe slot.

Bays	3
CPU	Intel Celeron J1800
Cores / Threads	2 / 2
RAM	2 GB
Product category	-
Badge	-
Hardware support status	Discontinued
OS/app support	Full
Technical support end	2025-12-31
Recommended replacement	TS-364
Release year	2018
RAID levels	Single, JBOD, RAID 0, RAID 1, RAID 5
RAM (max)	8 GB
Memory slots	2
Memory generation	DDR3L
Memory speed (MT/s)	1333 MT/s
ECC memory	Non-ECC
Memory module type	SODIMM
Network ports	1x 1GbE
USB ports	1x USB 3.2 Gen 1 + 2x USB 2.0
PCIe expansion	None
M.2 slots	2
Drive bay types	3.5" SATA HDD, 2.5" SATA HDD, 2.5" SATA SSD
Hot-swappable bays	Yes
CPU frequency (GHz)	2.41
Power supply (W)	65
Dimensions H x W x D	5.6 x 5.9 x 10.2 in (142 x 150 x 260.1 mm)
Weight	3.6 lb (1.64 kg)
Largest certified configuration observed	48 TB (3 x Toshiba MG08ACA16TEY, largest drive on the vendor HCL today; not a hardware limit)
Estimated cost to fill every bay with a certified 8 TB drive	about $915 new (Seagate ST8000NM0055) / about $840 refurbished (Western Digital WD81PURZ) / about $387 used (Western Digital WD82PURZ) -- one observed eBay unit price incl. shipping x bays; quantity availability unverified
Estimated cost to fill every bay with a certified 16 TB drive	about $1,785 new (Seagate ST16000VE000) / about $1,275 refurbished (Seagate ST16000NM001G) / about $927 used (Seagate ST16000NM001G) -- one observed eBay unit price incl. shipping x bays; quantity availability unverified

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Documents

• Product User Guide (PDF)
• hardware_datasheet

Compatible Drives

549 drives certified on TS-351's official manufacturer compatibility list, sourced directly from QNAP's own published Hardware Compatibility List. Each model links to that drive's own compatibility page.

Certified list last checked 2026-09-16.

Compatible Memory

4 memory modules listed by QNAP as compatible with TS-351. Third-party modules may also work, but are not shown here unless QNAP itself lists them as compatible.

Certified list last checked 2026-09-09. Coverage varies by model. Rated module speed is not a guarantee of NAS operating speed; follow the NAS maximum capacity and installation rules.

Looking for cameras compatible with QNAP NAS units? See the full QNAP camera compatibility database.