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Synology · UC series

Synology UC3400

The Synology UC3400 is a 12-bay dual-controller storage system built around the Intel Xeon D-1541 processor. Installed memory is 8 GB per controller, expandable to 64 GB. Networking is 2 x 1GbE RJ-45, 1 x 10GbE RJ-45, per controller. With expansion units it grows to 36 drive bays.

Drive bays
12
Processor
Intel Xeon D-1541
Memory
8 GB per controller
Network
10GbE

Who it suits

This is block storage for iSCSI and Fibre Channel, used behind virtualisation hosts and databases that need two controllers for continuous availability.

Synology UC3400 specifications

ProcessorIntel Xeon D-1541, 8-core, 2.1 GHz (burst 2.7 GHz), per controller
Memory installed8 GB per controller
Maximum memory64 GB (16 GB x 4) per controller
Drive bays12 x 3.5" dual-port SAS HDD or 2.5" dual-port SAS SSD
Maximum bays with expansion36
Network ports2 x 1GbE RJ-45, 1 x 10GbE RJ-45, per controller
Expansion slots1 x Gen3 x8 slot per controller
HDMInone
Form factorRackmount 2U
Size (H × W × D)88 x 430.5 x 692 mm
Weight19.7 kg
Power consumption239.25 W access
Noise level51.3 dB(A)
Power supply500 W
Warranty5 years

Specifications from Synology's published data, checked October 2026. See the UC3400 on Synology's website. Confirm details before ordering.

Usable capacity by RAID level

How much space the UC3400 gives with typical drive sizes.

RAID level12 × 4 TB12 × 8 TB12 × 12 TB12 × 16 TB12 × 20 TB
RAID 544 TB88 TB132 TB176 TB220 TB
RAID 640 TB80 TB120 TB160 TB200 TB
RAID 1024 TB48 TB72 TB96 TB120 TB

Space is shown before formatting; expect about 10% less in use. Larger systems are often split into more than one RAID group.

What we do with it

  • Storage

    NAS supply and installation

    A right-sized Synology, QNAP or Asustor unit with the drives, RAID level and network setup your office needs.

  • Backup

    Automatic backup setup

    Scheduled backups of PCs, servers and shared folders to the NAS, with an off-site copy, so nobody has to remember to do it.

  • Versions

    Ransomware protection for NAS

    Point-in-time snapshots and protected copies that let you roll a folder back to how it was before an attack or a mistake.

  • Move

    Data migration

    We move your files, users and permissions from old servers, external drives or an ageing NAS.

Questions about the UC3400

How much usable storage does the UC3400 give?

It depends on the drives and the RAID level. With 12 × 8 TB drives in RAID 5 you get about 88 TB before formatting. The capacity table on this page shows other combinations.

Can the UC3400 be expanded?

Yes. With Synology expansion units it supports up to 36 drive bays in total.

Can the memory in the UC3400 be upgraded?

Yes. It ships with 8 GB per controller and Synology lists a maximum of 64 GB.

Does the UC3400 have 10GbE?

Yes. Its network ports are 2 x 1GbE RJ-45, 1 x 10GbE RJ-45, per controller.

What warranty does the UC3400 have?

Synology lists a hardware warranty of 5 years for this model.

Do you supply the UC3400 with drives and installation?

Yes. We supply it with compatible drives fitted, configured and tested, and can install it at your office. Ask for a quote on this page.

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12-bay alternatives from other brands

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