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Synology RackStation RS4021xs+ NAS Server with Xeon 2.1GHz CPU, 64GB Memory, 128TB SSD Storage, 2 x 10GbE LAN Ports, Redundant Power, 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 nas & home servers 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 NAS and home-server hardware, 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

  • ✓ Hard drives and memory upgrades included separately not installed, installation required.
  • ✓ 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

Form Factor: NAS Rack ServerInternal File System Format: EXT4, BtrfsPorts: 4 x RJ-45 1GbE 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 ServiceProcessor: Xeon D-1541 8-Core 2.1GHz CPUMemory: 64GB DDR4 ECC UDIMMStorage: 128TB (16 x 8TB) SATA 2.5" SSDs for Ultra-Fast, High-Speed StoragePower: Redundant Power SupplyOperating System: Synology DSM SoftwareProvides reliable and safe data security and lightning-fast performance. Supports large multi-user environments while handling data…

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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 nas & home servers category. Synology's nas & home servers 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 nas & home servers 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

  • Xeon D-1541 8-Core 2.1GHz CPU, Up To 2.7GHz Turbo; 64GB DDR4 ECC UDIMM Memory; 128TB (16 x 8TB) SATA 2.5" SSDs for Ultra-Fast, High-Speed Storage
  • Securing Your Business Assets: The Synology RS4021xs+ is a 16-bay NAS that prioritizes data security and delivers lightning-fast performance, boasting over 234K 4K random read IOPS and 6,258 MB/s sequential read throughput. With an 8-core Xeon processor, ECC memory, advanced snapshot technology, and built-in dual-port 10GbE connectivity, it ensures robust data security and efficient handling of data-intensive workloads in large multi-user environments.
  • Engineered for Service Continuity: The RS4021xs+ is designed to ensure mission-critical data availability, even in the face of disasters. With redundant power supplies, hot-swappable fans, and Synology High Availability (SHA) for active-passive clustering with minute-level failover, businesses can maintain uninterrupted operations and maximize service availability.
  • Storage for Virtualization: Synology iSCSI storage seamlessly integrates with mainstream virtualization solutions such as vSphere, Hyper-V, XenServer, and Cinder. With features like vSphere 6.5 and VAAI integration, Windows Offloaded Data Transfer (ODX), and Synology Storage Console, the NAS enhances usability and simplifies storage provisioning and management in virtualized environments.
  • Hard drives and memory upgrades included separately not installed, installation required.

Full Specifications

Sizeb) 128TB SSD Storage
BrandSynology
ColorBlack
TurboYes
MaterialMetal
Unit Count1 Count
Mounting TypeRack Mount
Compatible DevicesServer
Enclosure MaterialMetal
Warranty DescriptionManufacturer
Full listing titleSynology RackStation RS4021xs+ NAS Server with Xeon 2.1GHz CPU, 64GB Memory, 128TB SSD Storage, 2 x 10GbE LAN Ports, Redundant Power, DSM Operating System Bundle with Rail kit

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Synology RackStation RS4021xs+ NAS Server with Xeon 2.1GHz CPU, 64GB Memory, 128TB SSD Storage, 2 x 10GbE LAN Ports, Redundant Power, 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, 128TB SSD Storage, 2 x 10GbE LAN Ports, Redundant Power, DSM Operating System Bundle with Rail kit
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