QNAP TS-855eU

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Status: Currently sold

An 8-bay 2U short-depth rackmount NAS from June 2023 with an 8-core Intel Atom - short-depth means it fits shallow racks and network cabinets. Two M.2 NVMe slots, two PCIe slots and up to 64 GB of ECC-capable RAM give it room to grow, though networking out of the box is two 2.5GbE ports.

Bays	8
CPU	Intel Atom C5125
Cores / Threads	8 / 8
RAM	8 GB
Product category	Business Storage
Badge	QuTS hero
Hardware support status	Full
OS/app support	Full
Technical support end	Active
Recommended replacement	-
Release year	2023
PCIe slot types	2x PCIe Gen 3 x4
RAM (max)	64 GB
Memory slots	2
Memory generation	DDR4
ECC memory	Supported
Memory module type	SODIMM
Replaceable memory	Replaceable
Network ports	2x 2.5GbE
USB ports	4x USB 3.2 Gen 1
PCIe expansion	2 x PCIe Gen3 (x4) ; Slot 1: PCIe Gen 3 (x4); Slot 2: PCIe Gen 3 (x4)
M.2 slots	2
Drive bay types	3.5-inch SATA hard disk drives; 2.5-inch SATA hard disk drives; 2.5-inch SATA solid state drives
Hot-swappable bays	Yes
CPU frequency (GHz)	2.8
Power draw, active (W)	79.113
Power draw, hibernation (W)	49.799
Power supply (W)	250
Dimensions H x W x D	3.5 x 17 x 11.7 in (89 x 432 x 297 mm)
Weight	17.9 lb (8.1 kg)
Largest certified configuration observed	256 TB (8 x Seagate ST32000NT000, largest drive on the vendor HCL today; not a hardware limit)
Estimated cost to fill every bay with a certified 8 TB drive	about $2,160 new (Seagate ST8000NM017B) / about $2,520 refurbished (Seagate ST8000NE001) / about $1,640 used (Western Digital WD80EFZX) -- 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 $4,000 new (Seagate ST16000NM000J) / about $3,400 refurbished (Seagate ST16000NM001G) / about $2,472 used (Seagate ST16000NM001G) -- one observed eBay unit price incl. shipping x bays; quantity availability unverified

• 2U short-depth rackmount NAS
• 2x 2.5GbE, 2x PCIe slots, 2x M.2 NVMe slots
• Long-term availability (Up to year 2030)

Search Amazon Search eBay (used from $2414.24) Official product page + Compare

1 eBay listings checked Nov 9, 2026 · 0 new, 1 used

Documents

• Product User Guide (PDF)

Compatible Drives

545 drives certified on TS-855eU'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

9 memory modules listed by QNAP as compatible with TS-855eU. 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.