Ubiquiti · NAS buying guide
Ubiquiti UNAS 4 · Exact identity: UNAS-4
4 primary bays · Ubiquiti embedded processor · 4GB factory memory · 1 × 2.5GbE · Diskless: hard drives cost extra
Catalog amount: $417 · recent · Price record: 2026-10-09T03:58:56.371550+00:00. Tax and shipping excluded.
Price observed at the store on the shown date. Confirm the current price and availability at the store.
UNAS 4: specifications and dated store comparison →Four bays and NVMe cache, still one 2.5GbE PoE+++ cable
UNAS-4 · official colors UNAS-4-B / UNAS-4-W · Quad-core ARM Cortex-A55 at 1.7 GHz · 4 GB · (4) 2.5/3.5-inch bays · (2) M.2 NVMe cache · 1×2.5GbE PoE+++ · UniFi Drive 3.4.5+
Based on the current US UniFi Store and UNAS 4 tech-specs tables (opened 2026-09-11), Ubiquiti’s limited warranty, NAS Compares’ original UNAS 4 review and August 2026 follow-up, and Dong Knows’ preliminary first look (no UNAS 4 speed charts). ChooseCompute has not tested this NAS itself. See the review evidence ↓
Official RAID 5/6/10, 2.5/3.5-inch trays, PoE+++ with a 90W adapter in the box, snapshots and multi-target backup.[2][1]
Follow any specification for its full conditions and sources.
Living with it
UNAS-4 uses the same 1.7 GHz Cortex-A55 and 4 GB memory as UNAS 2, in a 246×129×224.5 mm chassis. Official storage is four 2.5/3.5-inch bays plus two M.2 NVMe cache bays (2 TiB max). Power is PoE+++ with a 90W adapter included (80W drive budget, 90W max). On 2026-09-11 the US store showed $379 list / $408 with surcharge; UNAS-4-W Available, UNAS-4-B ComingSoon.[2][1]
NAS Compares reports 180–250 MB/s mixed transfers over 2.5GbE and about 46 W idle / 50–51 W active with four HDDs plus two NVMe. The RAID and drive models are not disclosed. Coywolf adds direct home-deployment and cloud-backup experience, without a throughput benchmark. Dong Knows is a preliminary first look.[4][12][6]
Current official documentation supports encryption, snapshots, Time Machine and remote/SMB/cloud backups. UNAS 4 has one storage pool and one RAID group. Cache supports suitable HDD pools; it cannot be newly assigned to an all-SSD pool or a legacy pool made before UniFi OS 4.3. Minimum Drive 3.4.5 is not a current shipping-version claim.[2][11][10]
NAS Compares’ August 2026 follow-up describes approximately 8 months with its UNAS 4, and Drive 4.3.10 / NAS OS 5.1.30 by August. This continues the original test, rather than adding an independent sample. USB-network stalls and iPhone photo-backup problems cited from other owners are reports, not measured defect rates or this reviewer’s controlled test.[5]
Our buying advice combines official specifications with the original reviews below. We have not tested this product ourselves. Expand a review for its setup, measurements and limitations.
Rob AndrewsMar 6, 2026
Mixed file transfers roughly 180–250 MB/s on 2.5GbE; cache helped repeated/small work more than huge sequential streams. ~14.1 W with no drives; ~46 W idle with 4 HDDs + 2 NVMe; ~50–51 W active.
Read the original reviewNAS Compares UniFi UNAS 4 review
Updated Mar 7, 2026
Tested: UNAS 4; mixed Windows file transfers including a 50 GB copy over native 2.5GbE, NVMe cache compared enabled/disabled. Power with four HDDs and two NVMe, plus empty chassis. Exact drive MPNs, RAID, firmware and client NIC are not specified in the available prose.
Applies to: Direct UNAS 4. Power figures include the stated HDD+NVMe set. Do not treat as UNAS 2 or UNAS Pro 4.
| Measurement | Result | Conditions & source location |
|---|---|---|
| Mixed transfers | About 180–250 MB/s | Mixed file types and a 50 GB Windows copy over 2.5GbE; no isolated cache-on/off numerical pair.Performance section |
| Power empty | 14.1 W | No drivesPower paragraph |
| Power populated idle/active | ~46 W idle; ~50–51 W active | 4 HDDs + 2 NVMePower paragraph |
Limits to keep in mind
Jon HenshawMar 29, 2026
Author reports successful monthly Backblaze B2 backup, Endpoint-assisted shared-folder access and very quiet operation with SATA SSDs.
Read the original reviewCoywolf UNAS 4 home deployment
Updated Jun 14, 2026
Tested: UNAS 4; four reused WD Red SATA SSDs in RAID 10, two 500 GB NVMe installed, 90W injector, Flex Mini 2.5G switch and Dream Router 7. Firmware unspecified.
Applies to: Direct qualitative deployment experience; no numeric performance benchmark.
Limits to keep in mind
Examples ordered by recorded drive unit price, which may be historical or an editorial reference. Check capacity, vendor compatibility, included storage and price evidence before choosing. These are component checks, not compatibility certifications.
Component total: $726.98 · historical · Oldest price record: 2026-10-09T01:23:41.974420+00:00 · 4TB raw, before redundancy.
Historical price estimate. Calculated from separately purchased components, not a complete-system offer. NAS price record: 2026-10-09T03:58:56.371550+00:00; drive price record: 2026-10-09T01:23:41.974420+00:00. Price observed at the store on the shown date. Confirm the current price and availability at the store. Historical price observation. Recheck the price and availability before buying; this is not a current offer. Recheck component prices, stock, shipping and tax at the stores before purchase; even recent checks do not guarantee live prices.
Component total: $796.98 · recent · Oldest price record: 2026-10-09T03:58:24.994342+00:00 · 8TB raw, before redundancy.
Dated price estimate. Calculated from separately purchased components, not a complete-system offer. NAS price record: 2026-10-09T03:58:56.371550+00:00; drive price record: 2026-10-09T03:58:24.994342+00:00. Price observed at the store on the shown date. Confirm the current price and availability at the store. Price observed at the store on the shown date. Confirm the current price and availability at the store. Recheck component prices, stock, shipping and tax at the stores before purchase; even recent checks do not guarantee live prices.
Component total: $806.98 · historical · Oldest price record: 2026-09-27T13:58:17.239646+00:00 · 8TB raw, before redundancy.
Historical price estimate. Calculated from separately purchased components, not a complete-system offer. NAS price record: 2026-10-09T03:58:56.371550+00:00; drive price record: 2026-09-27T13:58:17.239646+00:00. Price observed at the store on the shown date. Confirm the current price and availability at the store. Historical price observation. Recheck the price and availability before buying; this is not a current offer. Recheck component prices, stock, shipping and tax at the stores before purchase; even recent checks do not guarantee live prices.
Component total: $1,036.96 · historical · Oldest price record: 2026-10-09T01:23:41.974420+00:00 · 8TB raw, before redundancy.
Historical price estimate. Calculated from separately purchased components, not a complete-system offer. NAS price record: 2026-10-09T03:58:56.371550+00:00; drive price record: 2026-10-09T01:23:41.974420+00:00. Price observed at the store on the shown date. Confirm the current price and availability at the store. Historical price observation. Recheck the price and availability before buying; this is not a current offer. Recheck component prices, stock, shipping and tax at the stores before purchase; even recent checks do not guarantee live prices.
Component total: $1,176.96 · recent · Oldest price record: 2026-10-09T03:58:24.994342+00:00 · 16TB raw, before redundancy.
Dated price estimate. Calculated from separately purchased components, not a complete-system offer. NAS price record: 2026-10-09T03:58:56.371550+00:00; drive price record: 2026-10-09T03:58:24.994342+00:00. Price observed at the store on the shown date. Confirm the current price and availability at the store. Price observed at the store on the shown date. Confirm the current price and availability at the store. Recheck component prices, stock, shipping and tax at the stores before purchase; even recent checks do not guarantee live prices.
Before you buy
Budget SATA drives and optional NVMe trays/SSDs. Ubiquiti’s dated price is $408 including surcharge; white Available, black ComingSoon. Flytec displays $379 plus a separate MemorySurcharge 29.00 field and quote-only ordering; its structured offer says OutOfStock. Confirm a complete quote before comparing totals.[1][5][8]
90W PoE+++ exceeds typical PoE+ switch ports. Use the included injector unless the switch port is actually 90W-class.[2][6]
Official webstore coverage is two years from delivery. Authorized-channel coverage runs one year from shipment to that distributor/reseller. A reseller’s own purchase date is not automatically the warranty start date. UI Care is optional.[3]
UNAS-4 · official colors UNAS-4-B / UNAS-4-W · Quad-core ARM Cortex-A55 at 1.7 GHz · 4 GB · (4) 2.5/3.5-inch bays · (2) M.2 NVMe cache · 1×2.5GbE PoE+++ · UniFi Drive 3.4.5+ Check the total delivered price at the store.
Lowest observed price
$417
In stock at observation
Currency not confirmed
3 stores · 1 recent price observation
Seller not recorded
$417
Observed price
Currency not confirmed
In stock at observation · Condition not recorded
Observed Oct 9, 2026, 3:58:56 AM UTC[13]
View exact product at UbiquitiSold by Flytec Computers
$379
Historical price
Stock not confirmed · New
UNAS-4-W white diskless four-bay + M.2 cache slots
Not verified. Quote request / Online Reseller Restriction. Headline and structured price $379; separate MemorySurcharge field 29.00 means this is not a verified delivered total. Structured availability OutOfStock. Confirm final quote and stock.
Observed Sep 11, 2026, 9:55:00 AM UTC[8]
View exact product at Flytec ComputersSold by Microcom
$379
Historical price
Stock not confirmed · New
UNAS-4-B black diskless enclosure; HDD not included
6–8 week estimate only. 6–8 week ship estimate; confirm availability, any surcharge and authorized-channel eligibility. Ubiquiti coverage through authorized resellers runs from shipment to the reseller, not from the end buyer’s purchase.
Observed Sep 11, 2026, 9:55:00 AM UTC[9]
View exact product at MicrocomPrices are dated observations. Confirm the model, seller, condition, stock and delivered total at the store. Older prices remain visible as history. Links may earn a commission.
UNAS-4, sold as UNAS-4-B or UNAS-4-W. Same 1.7 GHz Cortex-A55 and 4 GB as UNAS 2, with four 2.5/3.5-inch bays, two M.2 cache slots and PoE+++.[1][2]
Drives are not included. NAS Compares: M.2 trays are sold separately even though the slots are in the chassis.[1][4]
Often only until 2.5GbE fills. NAS Compares saw ~180–250 MB/s mixed transfers — similar order of magnitude to UNAS 2’s link-limited tests — with cache helping some workloads.[4]
Research updated Sep 11, 2026. Individual source check dates are listed below. Measurements belong to the named reviewers; tested configurations and software versions may differ from the product you buy.
Checked Sep 11, 2026 · NEXT_DATA displaySku UNAS-4; UNAS-4-W Available $379/$408; UNAS-4-B ComingSoon
Checked Sep 11, 2026 · technicalSpecification Overview/Hardware/Software; RAID 5/6/10; SSD cache 2 TiB
Checked Sep 11, 2026 · Full policy read: two years from direct delivery; one year from shipment to authorized distributor/reseller; replacement does not extend term.
Checked Sep 11, 2026 · Parent read full available original written article via web; figure access limits recorded in audit.
Checked Sep 11, 2026 · Parent read full available original written article via web; figure access limits recorded in audit. Follow-up continues the same original test family.
Checked Sep 11, 2026 · Full original preliminary article read; no original throughput experiment. Daily scheduling assertions are historical.
Checked Sep 11, 2026 · UNAS-4-W Available $408 with surcharge
Checked Sep 11, 2026 · schema.org Offer price 379 USD, NewCondition, OutOfStock, sku UNAS-4-W
Checked Sep 11, 2026 · Item# UNAS-4-B $379.00; Usually ships in 6-8 weeks
Checked Sep 11, 2026 · For UNAS: single pool/group, drive counts and RAID footnotes; Pro-only conversion is not generalized.
Checked Sep 11, 2026 · UNAS 4 explicitly included; assignment, exclusion and failure behavior.
Checked Sep 11, 2026 · Jon Henshaw, published March 29 / updated June 14, 2026; original deployment and backup experience. Figures not independently recovered.
Checked Oct 9, 2026 · Captured observation; sha256:accc149c2412b8e68ac9ea4e5b1f4059b523ae4bdf4be02b033a4ab04cd40eb7
Independent review completed for the scope recorded in the audit.
Source evidence and review history (JSON)