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Green circuit board M.2 2280 SSD with gold edge connector and black controller chips

Synology Inc.

Synology Inc. SNV5420-400G M.2 2280 400GB PCI-Express 3.0 x4 enterprise SSD

SKU CH-ZS7Z-R7BY8

Enterprise M.2 2280 SSD delivering 3000 MBps reads and 700 TBW endurance for intensive caching workloads

  • Total capacity400 GB
  • Sequential read speedUp to 3,000 MB/s
  • Sequential write speedUp to 650 MB/s
  • Interface typePCI-Express 3.0 x4
  • Form factorM.2 2280
  • Random read (4K)Up to 225,000 IOPS
  • Delivers up to 3000 MBps sequential read speed for fast data access
  • Sustains 660,000 random read IOPS to accelerate caching workloads
  • Enterprise-grade endurance rated at 700 TBW for long-term reliability
  • Operates reliably from 0°C to 85°C in demanding server environments
  • Built for Synology systems with validated interoperability and automatic DSM firmware updates

Synology SNV5420-400G Enterprise SSD

The Synology SNV5420-400G is an enterprise-grade M.2 2280 solid-state drive offering 400GB capacity over a PCI-Express 3.0 x4 interface. It is designed for servers and NAS platforms that require consistent performance for caching and mixed workloads. Synology validates interoperability and delivers automatic firmware updates through DSM.

Thermals Noise and Power Draw

Active power draw is rated at 5.0 W during typical reads and 5.5 W during typical writes, dropping to 2.5 W at idle. The drive operates reliably between 0°C and 85°C, with a storage range extending to -40°C. No moving parts mean silent operation in any compatible slot.

Upgrade Path and Value

This drive replaces lower-endurance SSDs in write-intensive caching roles, backed by 700TB written endurance and a 3,000,000-hour MTBF. The jump is worth it when sustained random performance up to 660,000 read IOPS and 120,000 write IOPS is needed. It is not for buyers who require capacities beyond 400GB or interfaces other than PCI-Express 3.0 x4.

How it compares

Measured against everything we stock in Server & Data Center SSDs, at today’s prices. Recalculated every night.

Price $378.99
Cheaper than about 79% of the 1,039 comparable items (median $992.99).
Total capacity 400 GB
Lower than about 90% of the 522 comparable items (median 3.2 TB).
Sequential read speed Up to 3,000 MB/s
Lower than about 59% of the 311 comparable items (median 6,500 MB/s).
Price per TB $947.48 per TB
Pricier than about 79% of the 522 comparable items (median $595.64 per TB).

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Specifications

Product
Brand nameSynology
Model nameSNV5420-400G
Total capacity400 GB
Performance
Sequential read speedUp to 3,000 MB/s
Sequential write speedUp to 650 MB/s
Random read (4K)Up to 225,000 IOPS
Random write (4K)Up to 45,000 IOPS
Storage
Write endurance700 TB
Ports & slots
Interface typePCI-Express 3.0 x4
Power
Idle power draw2.5 W
Active power draw5.0 W read (Typ.), 5.5 W write (Typ.)
Size & build
Form factorM.2 2280
Overall height3.5 mm
Product depth22 mm
Product weight80 mm
Environment & compliance
Operating temperature range0 °C to 85 °C (32 °F to 185 °F)
Storage temperature range-40 °C to 85 °C (-40 °F to 185 °F)
More details
Mean time between failures3,000,000 h

Questions about this item

How do I install the M.2 2280 drive into a PCI-Express 3.0 x4 slot and what step is often missed?

Insert the M.2 2280 card into the PCI-Express 3.0 x4 slot at a 30-degree angle, secure it with the mounting screw, and verify the BIOS detects the 400GB device before configuring it in DSM.

What maintenance will the SNV5420-400G need and when should I plan a replacement?

Monitor lifetime wear analytics in DSM; the drive is rated for 700TB written and 3,000,000 hours MTBF, so plan replacement when health notifications indicate endurance is nearing its limit.

What is the first performance limit I will hit during sustained heavy writes?

Sustained 4K random write IOPS caps at 45,000, and sequential write throughput peaks at 650 MBps, so write-intensive caching workloads will encounter those ceilings first.

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