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Synology · XS+ and XS series

Synology RS3618xs

The Synology RS3618xs is a 12-bay rackmount NAS built around the Intel Xeon D-1521 processor. Installed memory is 8 GB DDR4 ECC UDIMM, expandable to 64 GB. Networking is 4 x 1GbE RJ-45. With expansion units it grows to 36 drive bays.

Drive bays
12
Processor
Intel Xeon D-1521
Memory
8 GB DDR4 ECC UDIMM
Network
1GbE

Who it suits

A rackmount unit suits an office with a server rack or a comms room. With this many bays it is typically used as central storage or as the backup target for a whole company.

Synology RS3618xs specifications

ProcessorIntel Xeon D-1521, 4-core, 2.4 GHz (burst 2.7 GHz)
Memory installed8 GB DDR4 ECC UDIMM
Maximum memory64 GB (16 GB x 4)
Drive bays12 x 3.5" SATA HDD or 2.5" SATA HDD/SSD
Maximum bays with expansion36
Network ports4 x 1GbE RJ-45
USB ports2 x USB 3.2 Gen 1
Expansion slots2 x Gen3 x8 slots
HDMInone
Form factorRackmount 2U
Size (H × W × D)88 x 482 x 724 mm
Weight14.5 kg
Power consumption142.76 W access / 55.05 W HDD hibernation
Noise level50.2 dB(A)
Power supply500 W
Warranty5 years

Specifications from Synology's published data, checked October 2026. See the RS3618xs on Synology's website. Confirm details before ordering.

Usable capacity by RAID level

How much space the RS3618xs 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 RS3618xs

How much usable storage does the RS3618xs 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 RS3618xs be expanded?

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

Can the memory in the RS3618xs be upgraded?

Yes. It ships with 8 GB DDR4 ECC UDIMM and Synology lists a maximum of 64 GB.

Does the RS3618xs have 10GbE?

Not built in. Its ports are 4 x 1GbE RJ-45. It has an expansion slot, which can take a faster network card where Synology lists one for this model.

What warranty does the RS3618xs have?

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

Do you supply the RS3618xs 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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