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Synology RackStation RS4021xs+ NAS Server with Xeon 2.1GHz CPU, 64GB Memory, 288TB HDD Storage, 2 x 10GbE LAN Ports, DSM Operating System Bundle with Rail kit
Synology

Synology RackStation RS4021xs+ NAS Server with Xeon 2.1GHz CPU

Bottom line: The Synology RackStation RS4021xs+ NAS Server with Xeon 2.1GHz CPU is a specs-and-price decision rather than a crowd-consensus one in the external storage category. Check the specification table below against one or two close alternatives — on price and spec fit, not on star ratings.

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By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014. For external drives and portable storage, synthesises manufacturer specs and independent reviews rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference.

Pros & Cons

Pros

  • ✓ Synology NAS chassis comes in a sealed box.
  • ✓ Backed by Synology's warranty and support channels

Cons

  • ✗ Check the listed dimensions, connectors and platform compatibility against your setup before ordering
  • ✗ Price, stock, shipping and returns are set by the retailer and may have changed since this page was last updated

Manufacturer description

Synology RackStation RS4021xs+ is a strong, adaptable 16-Bay rackmount NAS designed for growing businesses; rail kit included for easy server installation.Driving force capable of fitting into small & medium business environments with substantial, rigorous, multi-user workloads.Form Factor: NAS Rack ServerInternal File System Format: EXT4, BtrfsPorts: 4 x RJ-45 1GbE & 2 x RJ-45 10GbE LAN Ports (both with Link Aggregation/ Failover support); 2 x USB 3.2 Ports; 2 x Expansion Ports; Btrfs File System for Advanced LUN iSCSI ServiceProcessor: Xeon D-1541 8-Core 2.1GHz CPUMemory: 64GB DDR4 ECC…

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SpecPicks Verdict

SpecPicks scored Synology RackStation RS4021xs+ NAS Server with Xeon 2.1GHz CPU using a rating × review-volume × price-fit model applied to published specs and reviews across the external storage category. Synology's external storage lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for external storage of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Key Features

  • Synology RackStation RS4021xs+ is a powerful, versatile, and scalable 16-Bay rackmount NAS designed for growing businesses; sliding rail kit is included for effortless server installation. A powerhouse capable of fitting into small and medium business environments with intensive, multi-user workloads.
  • Xeon D-1541 8-Core 2.1GHz CPU, Up To 2.7GHz Turbo; 64GB DDR4 ECC UDIMM Memory; 288TB (16 x 18TB) SATA 3.5" HDDs for High-Capacity Storage; 4 x RJ-45 1GbE LAN Ports and 2 x RJ-45 10GbE LAN Ports (both with Link Aggregation / Failover support); 2 x USB 3.2 Ports; 2 x Expansion Ports; Btrfs File System for Advanced LUN iSCSI Service
  • Provides solid and protected data security and lightning-fast performance. Supports large multi-user environments while handling data sensitive workloads.
  • Synology NAS chassis comes in a sealed box.
  • Hard drives and memory upgrades included separately, NOT installed, installation required.

Full Specifications

Sizec) 288TB HDD Storage
BrandSynology
TurboYes
Unit Count1 Count
ConnectivityUSB
Model NumberRS4021xs+
Mounting TypeRack Mount
Number of Items1
Compatible DevicesServer
Warranty DescriptionManufacturer
Full listing titleSynology RackStation RS4021xs+ NAS Server with Xeon 2.1GHz CPU, 64GB Memory, 288TB HDD Storage, 2 x 10GbE LAN Ports, DSM Operating System Bundle with Rail kit

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Synology RackStation RS4021xs+ NAS Server with Xeon 2.1GHz CPU, 64GB Memory, 288TB HDD Storage, 2 x 10GbE LAN Ports, DSM Operating System Bundle with Rail kit is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

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Synology RackStation RS4021xs+ NAS Server with Xeon 2.1GHz CPU, 64GB Memory, 288TB HDD Storage, 2 x 10GbE LAN Ports, DSM Operating System Bundle with Rail kit
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