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Synology RS820RP+ 4-Bay RackStation NAS Diskless — main product image
Synology RS820RP+ 4-Bay RackStation NAS Diskless
Synology RS820RP+ 4-Bay RackStation NAS Diskless
Synology RS820RP+ 4-Bay RackStation NAS Diskless
Synology RS820RP+ 4-Bay RackStation NAS Diskless
Synology RS820RP+ 4-Bay RackStation NAS Diskless
Synology RS820RP+ 4-Bay RackStation NAS Diskless
Synology

Synology RS820RP+ 4-Bay RackStation NAS Diskless

★★★★★5.0 (11 reviews)
2 GB DDR4

Compact 4-bay rackmount NAS with redundant power, 10GbE readiness, and Btrfs snapshots from Synology.

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Overview

The Synology RackStation RS820RP+ is a 4-bay rackmount network-attached storage device designed for businesses that need centralized, reliable data management in a compact 1U form factor. Powered by a quad-core 2.1GHz processor with AES-NI hardware encryption support, it handles file sharing, automated backups, surveillance, and lightweight virtualization. The 2GB of DDR4 memory is expandable to 18GB, allowing the unit to scale its multitasking capability as demands increase. Storage capacity starts at four bays and can be doubled to eight by adding a Synology RX418 expansion unit, providing a clear growth path without replacing the entire NAS.

The RS820RP+ earns its "RP+" designation through built-in redundant power supply support, a critical feature for environments where uptime is non-negotiable. A PCIe 3.0 expansion slot accepts either a 10GbE network card—unlocking sequential read speeds exceeding 1,621 MB/s—or an M2D18 M.2 SSD adapter for SSD caching to accelerate frequently accessed data. The advanced Btrfs file system underpins data integrity with support for up to 65,000 system-wide snapshots, enabling granular point-in-time recovery without consuming excessive storage. Running Synology's DiskStation Manager operating system, the RS820RP+ also provides access to a broad ecosystem of packages for everything from cloud synchronization and mail hosting to Docker containers and Active Directory integration.

Key Features

4-Core, 2. 1 GHz CPU with AES-NI support. 2 GB DDR4 memory expandable up to 18 GB

Outstanding 10GbE sequential performance at over 1, 621 MB/s reading and 599 MB/s writing

Scale up to 8 drives with Synology expansion unit RX418

One Pie 3. 0 slot for an optional 10GbE add-in network interface card, or an M2D18 M. 2 SSD adapter card

Advanced Bars file system offering 65, 000 system-wide snapshots and 1, 024 snapshots per shared folder

Specifications

CPU
4-Core, 2.1GHz with AES-NI
Memory
2GB DDR4 (expandable to 18GB)
Drive Bays
4 (diskless)
Scalability
Up to 8 drives with RX418 expansion unit
10GbE Read Performance
Over 1,621 MB/s
10GbE Write Performance
599 MB/s
Expansion Slot
PCIe 3.0 (10GbE NIC or M2D18 M.2 adapter)
File System
Btrfs (65,000 system-wide snapshots, 1,024 per shared folder)
Power Supply
Redundant (RP+)
Form Factor
1U Rackmount

Pros & Cons

👍 Pros

  • Expandable from 4 bays to 8 bays with the RX418 expansion unit for growing storage needs
  • Redundant power supplies provide high availability and protection against power supply failure
  • PCIe 3.0 slot supports optional 10GbE or M.2 SSD caching adapter for performance upgrades
  • Btrfs file system with up to 65,000 snapshots provides comprehensive data integrity and recovery options
  • 2GB DDR4 RAM expandable to 18GB accommodates more concurrent users and heavier workloads

👎 Cons

  • Sold diskless, requiring separate purchase of compatible drives which adds to total cost
  • Base 2GB RAM is limited and will likely need upgrading for demanding multi-user or virtualization scenarios
  • 4-core 2.1GHz processor may bottleneck under heavy simultaneous file transfers and application loads
  • 10GbE capability requires purchasing an additional add-in card rather than being built in
  • 1U rackmount form factor limits the unit to 4 internal bays without the separate expansion unit

Frequently Asked Questions

No, the RS820RP+ is sold diskless. You need to purchase and install compatible 3.5-inch or 2.5-inch SATA drives separately.
Yes, you can scale up to 8 drives total by connecting a Synology RX418 expansion unit, doubling the available storage capacity.
The RS820RP+ has a PCIe 3.0 slot for installing an optional 10GbE network interface card, delivering sequential read speeds over 1,621 MB/s and write speeds of 599 MB/s with 10GbE.
It supports the advanced Btrfs file system, which enables up to 65,000 system-wide snapshots and 1,024 snapshots per shared folder for robust data protection.
Yes, the "RP+" designation indicates redundant power supply support, so the NAS stays operational if one power supply fails.

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