Mushkin Gamma 4TB Review — Phison E18 With Real Endurance (2026)
Quick answer
The Mushkin Gamma 4TB makes sense for two buyers: enthusiasts who specifically want a DRAM-cached, Phison E18 platform at 4 TB, and creators whose workloads value the 3,000 TBW endurance budget over a last few hundred megabytes per second.
Read: 7200 MB/s Write: 6890 MB/s Endurance: 3000 TBW Warranty: 5 years Interface: M.2 4.0 x 4
The Mushkin Gamma 4TB takes Phison's proven E18 flagship design and stretches it to 4 TB with a 3,000 TBW endurance budget and 7,200/6,890 MB/s ratings.
Controller & Memory
The Mushkin Gamma 4TB is the big-footprint version of Mushkin's flagship PCIe 4.0 line, and it keeps the ingredients that made the Gamma worth reviewing in the first place: a Phison PS5018-E18 controller, DDR4 DRAM cache, Micron 96-layer TLC and the full Phison feature set — SLC caching, LDPC error correction, end-to-end data protection and AES-256 hardware encryption — over a PCIe 4.0 x4 link with NVMe 1.4. The line launched in 2021 in 1 TB and 2 TB; the 4 TB model followed with its own spec sheet, and it is not a copy-paste job. Where the smaller members are rated 7,175/6,800 MB/s, the 4 TB steps up to 7,200 MB/s reads and 6,890 MB/s writes, with a 1,250K random-write IOPS rating that roughly doubles the smaller capacities' figure.
That capacity step also rewrites the endurance math. Mushkin rates the 4 TB at 3,000 TBW under a 5-year limited warranty — generous even against enthusiast rivals — and it is the reason this specific capacity makes sense rather than a bigger-box version of the same drive. Like every Gamma, it ships as a bare M.2 2280 board without a heatsink, so plan on motherboard heatspreader coverage or an aftermarket cooler, particularly because the E18 platform runs warmer than newer DRAM-less designs.
Against its competition, the Gamma 4TB sits in a narrow but real gap. The WD Black SN850X and Samsung 990 Pro are faster on paper at 4 TB and cost more; the Lexar NM790 4TB undercuts it on price with a DRAM-less InnoGrit design and 232-layer TLC but gives up the DRAM cache and Phison's mature platform. For buyers who want the E18's well-documented behavior — strong sustained performance, wide software support, predictable thermals — at a capacity where endurance stops being a worry, the Gamma 4TB is one of the few ways to get it.
Storage Comparisons:
Gamma Performance & Benchmarks
Mushkin rates the Gamma 4TB at 7,200 MB/s sequential reads and 6,890 MB/s writes, with 660K random-read and 1,250K random-write IOPS — manufacturer figures, but they sit exactly where E18 drives with TLC land in independent testing. Tom's Hardware's review of the line summed the platform up as fast, cool and well priced, and The SSD Review's 2 TB deep dive confirmed the hardware as a genuine flagship E18 build rather than a rebadged value board.
Mushkin Gamma 4 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
- Mushkin Gamma 4 TB (this drive): 7,200 MB/s read, 6,890 MB/s write
In practice, the 7,200 MB/s read rating means operating system boots and game loads that are indistinguishable from any top-tier PCIe 4.0 drive, and the near-7,000 MB/s write rating keeps large installs and file copies moving at full wire speed for the interface. The SLC cache absorbs burst writes first; once it exhausts on very large sustained transfers, throughput settles to native TLC rates — with 4 TB of dies behind it, the cache is deep enough that only multi-hundred-gigabyte copy sessions will see the drop. Random-write strength of 1,250K IOPS keeps heavy multitasking, compile jobs and small-file work responsive.
Thermals deserve planning rather than concern: the E18 is a warm-running controller at sustained load, and this board ships without a heatsink. Under a motherboard's heatspreader it behaves like any other E18 drive; bare in a laptop slot, expect throttling only during long, full-speed writes. For DirectStorage games and general desktop work, the platform is mature, well supported by Phison's toolbox ecosystem, and behaves predictably.
Mushkin Gamma vs Competitors
See how the Gamma stacks up against other M.2 4.0 x 4 drives in our database:
Compare with rival drives:
Endurance, TBW & Warranty
Mushkin backs the Gamma 4TB with a 5-year limited warranty rated to 3,000 TBW, whichever arrives first. That endurance figure is roughly 375 TBW per terabyte — a class-leading budget that lets the drive take sustained creator workloads without flinching. To burn through 3,000 TBW within the warranty period you would need to write over 100 GB every day for five years straight, far beyond anything a gaming PC or typical workstation produces. The rated MTBF is 1,600,000 hours, a population statistic that describes expected failure rates across large fleets rather than a promise about any individual drive. Warranty claims run through Mushkin's standard support channels with proof of purchase; the smaller Gamma capacities carry the same 5-year term with endurance scaled to capacity. Note that no heatsink is included, and adding third-party cooling does not affect warranty coverage.
Mushkin Gamma 4 TB Specifications
| Category | Value |
|---|---|
| Capacity [?] | 4 TB |
| Interface [?] | M.2 4.0 x 4 |
| Controller [?] | Phison PS5018 E18 8 Channel |
| Memory type [?] | Micron 96-L TLC |
| DRAM [?] | Yes |
| Read speed (MB/s) [?] | 7200 |
| Write speed (MB/s) [?] | 6890 |
| Read IOPS [?] | 660000 |
| Write IOPS [?] | 1250000 |
| Endurance (TBW) [?] | 3000 |
| MTBF (million hours) [?] | 1600000 |
| Warranty (years) [?] | 5 |
Verdict: Is the Gamma Worth It in 2026?
The Mushkin Gamma 4TB makes sense for two buyers: enthusiasts who specifically want a DRAM-cached, Phison E18 platform at 4 TB, and creators whose workloads value the 3,000 TBW endurance budget over a last few hundred megabytes per second. Skip it if you want the cheapest capacity per terabyte — the DRAM-less Lexar NM790 4TB serves that crowd — or if flagship bragging rights matter, where the WD Black SN850X and Samsung 990 Pro post higher rated writes and deeper review pools. What the Gamma offers instead is predictability: a mature controller, DRAM steadying heavy random writes, and endurance that removes any anxiety about write wear. For a proven, fully DRAM-equipped Gen4 design with room to spare, the Gamma 4TB is an easy recommendation to stand behind.
+ Pros
- 7,200 MB/s reads and 6,890 MB/s writes rated
- 3,000 TBW endurance with 5-year warranty
- Phison E18 with DDR4 DRAM cache
- 1,250K random-write IOPS rating
- AES-256 hardware encryption
- Cons
- Ships without a heatsink
- Rated writes sit just below the 7,000 MB/s flagship tier
- Micron 96-layer TLC is an older-generation fabric
- Phison E18 draws more power than newer DRAM-less designs
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