Synology RS820+

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Status: Legacy / discontinued

A 4-bay 1U rackmount NAS for midsize offices, with a quad-core Intel Atom and four Gigabit ports. RAM goes from 2 GB to 18 GB, and an RX418 adds four more bays. A PCIe slot lets you add M.2 caching or faster networking.

Series	x20 Series
Bays	4
CPU	Intel Atom C3538
Cores / Threads	4 / 4
RAM	2 GB
CPU architecture	x86_64
Support tier	limited
Warranty (years)	3
Release year	2019
RAID levels	Basic, JBOD, RAID 0, RAID 1, RAID 5, RAID 6, RAID 10, SHR
PCIe slot types	1x PCIe Gen 3 x8
RAM (max)	18 GB
Memory slots	1
Memory generation	DDR4
ECC memory	Non-ECC
Memory module type	SODIMM
Replaceable memory	Replaceable
Network ports	4x 1GbE
USB ports	2x USB 3.0
PCIe expansion	1
M.2 slots	None
Max raw capacity	56
Drive bay types	3.5" SATA HDD, 3.5" SATA SSD, 2.5" SATA HDD, 2.5" SATA SSD
Hot-swappable bays	Yes
CPU frequency (GHz)	2.1
Power draw, active (W)	38
Power draw, hibernation (W)	14.3
Dimensions H x W x D	1.7 x 18.9 x 19.4 in (44 x 480 x 492.6 mm)
Weight	14.1 lb (6.4 kg)
Estimated cost to fill every bay with a certified 8 TB drive	about $1,220 new (Seagate ST8000NM0055) / about $796 refurbished (Seagate ST8000NM0045) / about $700 used (Seagate ST8000NM0045) -- 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 $1,900 new (Seagate ST16000NM001G) / about $2,396 refurbished (Toshiba MG08ACA16TE) / about $1,400 used (Toshiba MG08ACA16TE) -- one observed eBay unit price incl. shipping x bays; quantity availability unverified

View on Amazon Search eBay (used from $180.00) + Compare

3 eBay listings checked Nov 8, 2026 · 1 new, 2 used (too few new listings to show a reliable new price)

Documents

• Datasheet (PDF)
• Product Specifications (PDF)

Compatible Drives

472 drives certified on RS820+'s official manufacturer compatibility list, sourced directly from Synology's own published Hardware Compatibility List. Each model links to that drive's own compatibility page.

Certified list last checked 2026-08-18.

Compatible Memory

1 memory module listed by Synology as compatible with RS820+. Third-party modules may also work, but are not shown here unless Synology itself lists them as compatible.

Certified list last checked 2026-09-16. 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 Synology NAS units? See the full Synology camera compatibility database.