UniFi UNAS Pro 4 NAS Review

Why It Matters

The UNAS Pro 4 brings affordable 1U, dual‑10 GbE NAS performance to SMBs, but its single PSU and fan noise require careful planning for reliability and acoustic environments.

Key Takeaways

• UniFi UNAS Pro 4 offers dual 10GbE ports in 1U
• Includes quad‑core ARM CPU, 8 GB DDR4, and OS on separate drive
• Two M.2 slots enable SSD caching but require separate trays
• Noise stays low at idle, spikes to 56 dBA under max cooling
• Power draw ranges 50 W (HDD) to 62 W (active), 32 W with SSDs

Summary

The video reviews UniFi’s latest 1U rack‑mount NAS, the UNAS Pro 4, launched in mid‑September 2025. Priced at $499, the unit packs four hot‑swap bays, two M.2 NVMe slots, a quad‑core ARM processor, 8 GB DDR4 memory, and a dedicated OS drive, while offering dual 10 GbE SFP+ ports and a supplemental 1 GbE management interface.

The reviewer highlights several design choices: a fully metal chassis, click‑load drive trays (though not lockable), a lockable internal PSU, and a proprietary power‑backup module that replaces traditional redundant PSUs. While the M.2 slots provide valuable SSD caching, they require an optional tray and cannot be used for primary storage pools. The unit lacks USB ports and Wi‑Fi, but includes Bluetooth for initial setup, a rare convenience in rack‑mount NAS devices.

Performance testing shows the device is quiet at idle (42‑44 dBA) and can be reduced to 38‑40 dBA in silent mode, but fan noise jumps to 56‑57 dBA under maximum cooling. Power consumption varies with drive type: roughly 50‑62 W with enterprise HDDs under load, dropping to about 32 W when equipped with SSDs. CPU temperatures hover around 55 °C, and the system’s thermal design relies on aggressive fan curves to maintain stability.

For small‑to‑medium businesses, the UNAS Pro 4 delivers enterprise‑grade networking and flexible caching at a consumer‑friendly price, but buyers must consider the lack of redundant power, optional M.2 trays, and higher fan noise under heavy workloads. Its dual 10 GbE connectivity and ARM efficiency make it a compelling choice for latency‑sensitive workloads, provided adequate cooling and power‑backup strategies are in place.

Original Description

- UniFi UNAS Pro 4 ($499) - https://store.ui.com/us/en/products/unas-pro-4?a_aid=nascompares

UniFi UNAS Pro 4 (BIG Written Review & Tests) - https://nascompares.com/review/unas-pro-4-review/

- UniFi UNAS 2 ($199) - https://store.ui.com/us/en/products/unas-2?a_aid=nascompares

- UniFi UNAS Pro 8 ($799) - https://store.ui.com/us/en/products/unas-pro-8?a_aid=nascompares

- UniFi UNAS 4 ($379) - https://store.ui.com/us/en/products/unas-4?a_aid=nascompares

- Original UNAS Pro 7-Bay ($499) - https://store.ui.com/us/en/products/unas-pro?a_aid=nascompares

UniFi UNAS 1 Year Later - https://www.youtube.com/watch?v=jjaJG5jLoLk

UniFi UNAS Drive 4.0 - https://www.youtube.com/watch?v=RWAbRDawTfs

UniFi UNAS Pro 8 Original Review - https://www.youtube.com/watch?v=UOOFqhf4S8k

UNAS Pro 8 Testing Video - https://www.youtube.com/watch?v=qjemFLOFqZU

UniFi UNAS - 1 Year Later. Should You Buy Now? https://nascompares.com/guide/unifi-unas-1-year-later-should-you-buy-now/

UniFi UNAS Pro 8 Written Review - https://nascompares.com/2025/09/18/unifi-unas-pro-8-review/

- UniFi UNAS M.2 NVMe Adapter ($19.99) - https://store.ui.com/us/en/products/uacc-ssd-tray?a_aid=nascompares

UniFi UNAS 2 Review https://youtu.be/1jcQaWI5C_g

UniFi UNAS Pro 8 Review https://youtu.be/UOOFqhf4S8k

UniFi UNAS Pro, 6 Months Later (video) - https://www.youtube.com/watch?v=eZMJoQBNV3U

The $199 UniFi USB4/TB4 to 10GbE Adapter - https://store.ui.com/us/en/products/uacc-adapter-rj45-usbc-10ge?a_aid=nascompares

UniFi UNAS Pro - 6 MONTHS LATER https://nascompares.com/guide/unifi-unas-pro-6-months-later/

UniFi UNAS Pro - 3 MONTHS LATER https://www.youtube.com/watch?v=0TOX1NIVQyQ

UniFi 10GbE PoE Mains Adapter $39 - https://store.ui.com/us/en/collections/pro-store-poe-and-power-adapters/products/uacc-poe-plus-plus-10g?a_aid=nascompares

The UniFi UNAS Pro NAS Review https://nascompares.com/review/the-unifi-unas-pro-nas-review/

Video Chapters

00:00 The IMPORTANCE of 1U Racks

01:08 Specs and Price

01:32 Dedicated OS Drive

01:47 Chassis and Rails

02:28 Packaging Notes

02:44 Drive Trays Overview

03:41 M.2 Cache Only

04:27 Optional M.2 Tray

05:14 PSU Cable Lock

05:30 No Redundant PSU

06:11 UniFi Power Backup

07:21 Dual 10GbE Ports

08:36 No USB Ports

09:13 Bluetooth Setup Feature

09:53 Noise Test Results

11:07 Maximum Fan Noise

12:13 Power Test Method

13:31 HDD Power Usage

14:16 SSD Power Comparison

14:56 CPU Temperature Behaviour

16:12 24 Hour Thermals

17:31 Real World Performance

18:31 10GbE Transfer Speeds

19:59 Synthetic Benchmarks

20:36 SSD Value Question

20:51 Software Overview

22:03 File Access Options

22:28 Basic File Manager

23:08 RAID and Snapshots

23:26 Backup Integrations

24:17 Snapshot Controls

25:20 Limited Advanced Controls

25:39 Remote Access Limits

26:16 Software Roadmap Potential

26:58 $499 Value Verdict

27:40 Key Complaints Summary

28:17 Who Should Buy?

Synology vs UniFi UNAS Pro - https://youtu.be/iTbSuDgEPM8

UniFi UNAS Pro, PROS and CONS - https://youtu.be/_07W7NKxEno

UniFi UNAS Pro VS QNAP NAS - https://youtu.be/D8CpPW_m7EQ

UniFi UNAS Pro NAS - BIG REVIEW https://youtu.be/rbq2so5S-zI

UniFi UNAS Pro. COMPLETE SETUP GUIDE https://youtu.be/x7k-eUeQl7U

The PROs and CONs of UniFi Networking (in 2024) https://nascompares.com/2024/06/24/the-pros-and-cons-of-unifi-networking-in-2024/

Thinking of buying a product mentioned in today's video? If this video has helped you make that decision, you can find the things I mention using the links here and we will get a small % profit of whatever you buy, which goes directly back to NASCompares and allows me and Eddie to keep doing what we do here on YouTube and the Blog. Alternatively, head straight to Amazon here - https://amzn.to/3TjM0kj

Official UniFi 5Port 10GbE Switch Page - https://ca.store.ui.com/ca/en/collections/unifi-switching-utility-10-gbps-ethernet

Reddit Discussion - https://www.reddit.com/r/Ubiquiti/comments/1b40dcx/unifi_nas_professional_user_manual_ht_mutable/?share_id=uhgsiCP24w8Ziy3EBCuW4&utm_content=1&utm_medium=ios_app&utm_name=ioscss&utm_source=share&utm_term=1