Sabrent Rocket 4 1TB Review — Flagship Speed, DRAM-Less Board (2026)
Quick answer
The Sabrent Rocket 4 1TB is the pick for buyers who want top-of-class Gen4 speed in a single-sided, laptop-and-PS5-friendly package and can live with DRAM-less sustained behavior — TweakTown's ranking of it among the best Gen4 drives is consistent with both its silicon and its measured results.
Read: 7400 MB/s Write: 6400 MB/s Endurance: 600 TBW Warranty: 5 years Interface: M.2 4.0 x 4
The refreshed Sabrent Rocket 4 1TB drops the DRAM, goes single-sided and keeps 7,400/6,400 MB/s Gen4 ratings — TweakTown ranked it among the best Gen4 drives.
Controller & Memory
The Sabrent Rocket 4 1TB carries a name that has been around since 2020, but the drive wearing it today is a different machine. The original paired Phison's E16 with DRAM and 96-layer TLC for 5,000/4,400 MB/s; the current revision — SKU SB-RKT4L, sold on Amazon as Rocket 4 DRAM-Less — is a clean-sheet refresh built on Phison's four-channel PS5027-E27T running DRAM-less with Host Memory Buffer, behind Kioxia BiCS6 TLC. The rated numbers moved forward anyway: 7,400 MB/s sequential reads and 6,400 MB/s writes over PCIe 4.0 x4, with 1,000K random-read and 950K random-write IOPS, all on a single-sided M.2 2280 board. It is, component for component, the same silicon Corsair uses in the MP600 Elite.
Single-sided is the quiet headline. With every chip on one side, the drive fits the shallow slots of thin laptops, handhelds and the PS5 without modification, and Sabrent's low-power claims for the E27T platform make it a credible console and portable upgrade — Tom's Hardware's testing found it drawing less power than Crucial's T500, itself an efficiency benchmark in the Gen4 field.
The competition frames the value question. Corsair's MP600 Elite shares the platform and usually undercuts on price; the WD Black SN850X and Samsung 990 Pro keep their DRAM caches and sit a tier above in sustained work; Crucial's T500 fights the same DRAM-less flagship fight. Sabrent's counter is a five-year warranty stated with no registration required — a break from the company's older practice — plus a verdict from TweakTown that placed this refresh among the best Gen4 drives currently available.
Storage Comparisons:
Rocket 4 Performance & Benchmarks
Sabrent rates the refreshed 1 TB Rocket 4 at 7,400 MB/s sequential reads, 6,400 MB/s writes, 1,000K random-read IOPS and 950K random-write IOPS — figures its official listing shares across both capacities of the line.
Sabrent Rocket 4 1 TB vs M.2 4.0 x 4 peers
Switch between sequential throughput and random IOPS to see how this drive stacks up against other M.2 4.0 x 4 SSDs in our database. The highlighted bar is the drive on this page — click any other bar to open that drive.
- Patriot Viper PV593 1 TB: 14,500 MB/s read, 14,000 MB/s write
- Patriot Viper PV593 2 TB: 14,500 MB/s read, 14,000 MB/s write
- Patriot Viper PV593 4 TB: 14,500 MB/s read, 14,000 MB/s write
- Patriot Viper PV573 2 TB: 14,000 MB/s read, 12,000 MB/s write
- Sabrent Rocket 4 1 TB (this drive): 7,400 MB/s read, 6,400 MB/s write
Independent testing gives the ratings real texture. TweakTown's 1 TB review measured 104 MB/s at 4K Q1T1 — the strongest low-queue random-read figure the outlet had recorded from a DRAM-less drive — and the platform's Phison-origin I/O+ and DirectStorage support put the drive among the Gen4 models best prepared for modern game-streaming features. Tom's Hardware's testing of the 2 TB sibling confirmed the efficiency story, with power draw beating the Crucial T500. In TweakTown's PS5 testing the drive read at 6,497 MB/s, comfortably above Sony's 5,500 MB/s recommendation.
The DRAM-less trade appears exactly where expected: sustained writes. A pseudo-SLC cache absorbs bursts at full speed, and once it fills, throughput settles well below the 6,400 MB/s headline — TweakTown's post-cache charts were unflattering, as they are for every drive on this platform. For boot-and-games duty the cache rarely empties; for scratch-disk or backup workloads, a DRAM-equipped rival such as the SN850X holds its speed longer. Nothing about the ratings suggests more than the platform delivers, and the platform delivers at the top of the DRAM-less class.
Sabrent Rocket 4 vs Competitors
See how the Rocket 4 stacks up against other M.2 4.0 x 4 drives in our database:
Compare with rival drives:
Endurance, TBW & Warranty
Sabrent warrants the Rocket 4 1TB for five years, and the current product listing states explicitly that no registration is required — a welcome change from older Sabrent SSDs, which needed registration to unlock the full term. The endurance picture is less explicit: Sabrent's product pages leave TBW unpublished for this revision. Tom's Hardware's launch coverage of the refresh put the allocation at 600 TBW per 1 TB of capacity — 600 TBW at this size — and that figure is the best capacity-specific number available. At 20 GB of writes per day, 600 TBW stretches past 80 years, so the warranty term, not the flash, is the practical limit. The MTBF figure is unpublished, and claims run directly through Sabrent's US-based support, a channel with a generally responsive reputation among enthusiasts, subject to standard proof-of-purchase practice.
Sabrent Rocket 4 1 TB Specifications
| Category | Value |
|---|---|
| Capacity [?] | 1 TB |
| Interface [?] | M.2 4.0 x 4 |
| Controller [?] | Phison PS5027-E27T |
| Memory type [?] | Kioxia BiCS6 TLC |
| DRAM [?] | No |
| Read speed (MB/s) [?] | 7400 |
| Write speed (MB/s) [?] | 6400 |
| Read IOPS [?] | 1000000 |
| Write IOPS [?] | 950000 |
| Endurance (TBW) [?] | 600 |
| MTBF (million hours) [?] | n/a |
| Warranty (years) [?] | 5 |
Verdict: Is the Rocket 4 Worth It in 2026?
The Sabrent Rocket 4 1TB is the pick for buyers who want top-of-class Gen4 speed in a single-sided, laptop-and-PS5-friendly package and can live with DRAM-less sustained behavior — TweakTown's ranking of it among the best Gen4 drives is consistent with both its silicon and its measured results. Skip it for heavy sustained writing, where the WD Black SN850X's DRAM cache holds its pace long after the Rocket 4's pseudo-SLC cache empties. Corsair's MP600 Elite pairs identical hardware and deserves a price comparison before committing. As the DRAM-less refresh of a legacy name, the Sabrent Rocket 4 1TB finally makes that name mean something again — with the usual Sabrent premium attached.
+ Pros
- 7,400/6,400 MB/s Gen4 ratings
- Single-sided PCB suits laptops and PS5
- 1,000K/950K rated random IOPS
- 5-year warranty, no registration needed
- Lower power draw than Crucial T500
- 104 MB/s 4K Q1T1 in TweakTown testing
- Cons
- DRAM-less: HMB instead of onboard cache
- Sustained writes fall once the pSLC cache fills
- No TBW figure published by Sabrent
- No heatsink included
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