# Mushkin Delta 4TB Review — Budget 4TB PCIe 4.0 QLC Mass Storage (2026)

The Mushkin Delta 4TB is the highest-capacity model in Mushkin's budget PCIe 4.0 lineup, targeting buyers who need massive NVMe storage at the lowest possible price per gigabyte — even if it means accepting QLC NAND's performance trade-offs.

Quick answer: The Mushkin Delta 4TB serves a specific niche: buyers who need maximum NVMe storage at the lowest price per gigabyte. The 4TB capacity holds enormous game libraries, media collections, and file archives. The 5-year warranty is reassuring for a QLC drive. But the Phison E16 controller and QLC NAND combination means this drive is not suitable as a primary system drive or for write-heavy workloads — the sustained write speed collapse after SLC cache exhaustion is a genuine limitation. As a secondary bulk storage drive in a desktop or NAS, the Delta 4TB delivers on its capacity promise. For primary storage, invest in a TLC-based alternative like the Mushkin Gamma 2TB or the WD Black SN850X.

## Specifications

| Specification | Value |
| --- | --- |
| Capacity | 4 TB |
| Interface | M.2 4.0 x 4 |
| Controller | Phison E16 |
| Memory type | 3D QLC |
| DRAM cache | 4GB DDR4 |
| Sequential read | 4975 MB/s |
| Sequential write | 3975 MB/s |
| Random read IOPS | 700000 |
| Random write IOPS | 650000 |
| Endurance | 800 TBW |
| MTBF | 1.8 |
| Warranty | 5 years |

## Performance

The Mushkin Delta 4TB is rated at up to 4,975 MB/s sequential reads and 3,975 MB/s sequential writes, with 700,000 IOPS random reads and 650,000 IOPS random writes. On paper, these numbers suggest a competent PCIe 4.0 drive. In practice, the QLC NAND architecture tells a different story.

The 4,975 MB/s read speed is genuinely useful. The Phison E16 controller handles sequential reads efficiently, and 4K random reads at 700K IOPS deliver snappy OS responsiveness and fast application launches. For the Delta 4TB's target audience — users who store large amounts of data and read it frequently — the read performance is entirely adequate.

The write performance is where QLC limitations dominate. The 3,975 MB/s burst write speed is achieved only while the SLC cache is active. On a 4TB drive, the dynamic SLC cache is larger in absolute terms than on smaller capacities — potentially several hundred gigabytes on a fresh drive with plenty of free space. This means the 4TB Delta can sustain burst-speed writes longer than its 1TB and 2TB siblings before the cache fills.

Once the SLC cache exhausts, direct-QLC write speeds on the Phison E16 platform typically fall to 80–150 MB/s. This is slower than a 7,200 RPM mechanical hard drive. Copying a 200 GB video project to this drive will start at nearly 4,000 MB/s and eventually slow to a crawl. For users who understand this limitation and plan their workflows around it — moving large files in smaller batches, or using the drive primarily for read-heavy access — the 4TB Delta remains a functional choice.

The 4TB capacity's advantage is its massive SLC cache buffer in absolute terms. A nearly empty 4TB drive may have 800 GB or more of pseudo-SLC space, enough for most consumer transfers without hitting the direct-QLC wall. But as the drive fills up, the cache shrinks proportionally, and sustained write performance degrades.

## Endurance, TBW & Warranty

Mushkin covers the Delta 4TB with a 5-year limited warranty and an 800 TBW endurance rating. The 800 TBW figure is listed identically across all Delta capacities in the source data, which is unusual — a 4TB drive with four times the NAND cells should logically have four times the endurance of a 1TB model. At 800 TBW, the 4TB model could handle roughly 438 GB of writes per day across the five-year warranty period. For a bulk storage drive generating 20–50 GB per day, the 4TB Delta would take 44 to 110 years to reach 800 TBW. Even if the actual endurance is lower than stated, the 4TB capacity's sheer size means most users will never approach the TBW limit. The 5-year warranty is generous for a QLC drive. Mushkin handles warranty claims directly as a retail brand.

## Pros and Cons

**Pros:**

- 4TB capacity for massive game and media libraries
- Competitive price per gigabyte at roughly 12 cents/GB
- 5-year limited warranty
- Adequate read performance for everyday workloads
- Large absolute SLC cache on a nearly empty 4TB drive
**Cons:**

- QLC NAND — sustained writes drop to ~80-150 MB/s after cache fills
- Phison E16 is a superseded first-gen PCIe 4.0 controller
- 800 TBW endurance seems low for a 4TB drive
- Not suitable as a primary system drive
- Double-sided PCB may not fit thin laptops


## Verdict

The Mushkin Delta 4TB serves a specific niche: buyers who need maximum NVMe storage at the lowest price per gigabyte. The 4TB capacity holds enormous game libraries, media collections, and file archives. The 5-year warranty is reassuring for a QLC drive. But the Phison E16 controller and QLC NAND combination means this drive is not suitable as a primary system drive or for write-heavy workloads — the sustained write speed collapse after SLC cache exhaustion is a genuine limitation. As a secondary bulk storage drive in a desktop or NAS, the Delta 4TB delivers on its capacity promise. For primary storage, invest in a TLC-based alternative like the Mushkin Gamma 2TB or the WD Black SN850X.

## Frequently Asked Questions

### Is the Mushkin Delta 4TB good for gaming?

The Mushkin Delta 4TB works well as a secondary gaming storage drive. The 4TB capacity holds 40+ modern games, and game load times from QLC NAND are comparable to TLC since loading is a read operation where both technologies perform similarly. However, installing or updating large games will be slow once the SLC cache exhausts. Use this drive for storing your game library, not as your primary OS drive. For a primary gaming drive, TLC-based alternatives like the WD Blue SN580 2TB deliver better all-around performance.

### Does the Mushkin Delta 4TB have DRAM?

The available information on DRAM for the Mushkin Delta 4TB is unclear. The source database lists DRAM as 'n/a', while the Phison E16 reference design typically includes a DRAM cache. Mushkin may have used a DRAM-less variant to keep costs down at this capacity. If DRAM-less, the drive likely uses HMB (Host Memory Buffer), which provides adequate performance for read-heavy bulk storage workloads.

### What is the TBW endurance of the Mushkin Delta 4TB?

The source data lists the Mushkin Delta 4TB at 800 TBW, covered by a 5-year limited warranty. This is the same endurance rating as the 1TB and 2TB models, which is unusual — a 4TB drive with four times the NAND cells should logically have higher endurance. The actual endurance may be greater than the stated figure. At 800 TBW, you could write roughly 438 GB daily for five years. For a bulk storage drive used primarily for reading (game library, media archive), actual write volume will be far lower, and the drive should easily outlast the warranty.

### Is the Mushkin Delta 4TB good as a secondary storage drive?

Yes, the Mushkin Delta 4TB excels as a secondary bulk storage drive. Its 4TB capacity is ideal for game libraries, media archives, and file storage where you read data more often than you write it. The QLC NAND's limitations — slow sustained writes after SLC cache exhaustion — are less impactful in a secondary role where the drive is primarily accessed for reading existing files. Install your OS and applications on a faster TLC drive, and use the Delta 4TB for mass storage.

### Is the Mushkin Delta 4TB compatible with the PS5?

No, the Mushkin Delta 4TB does not meet Sony's PS5 expansion requirements. Sony mandates a minimum 5,500 MB/s sequential read speed, and the Delta is rated at 4,975 MB/s. Additionally, the QLC NAND's slow sustained writes would make PS5 game installations painfully slow. For PS5 expansion, choose a TLC-based PCIe 4.0 drive rated at 5,500 MB/s or higher, such as the WD Black SN850X or Seagate FireCuda 530.

### How does the Mushkin Delta 4TB compare to the Sabrent Rocket Q 4TB?

The Mushkin Delta 4TB and Sabrent Rocket Q 4TB are very similar drives — both use the Phison E16 controller with QLC NAND, targeting the budget bulk-storage segment. Both offer 4TB capacity at a low price per gigabyte. The Sabrent Rocket Q is often priced slightly higher but includes Sabrent's reputation for customer support. In raw performance, the drives are comparable, with similar burst speeds and similar QLC write-speed collapse after SLC cache exhaustion. Choose based on availability and pricing at the time of purchase.

### Does the Mushkin Delta 4TB need a heatsink?

No, the Mushkin Delta 4TB does not strictly need a heatsink. The Phison E16 controller generates moderate heat, and QLC NAND produces relatively little thermal output. In a desktop motherboard with basic M.2 ventilation, the drive stays within safe operating temperatures. If your motherboard includes an M.2 heatsink, using it is good practice but not essential. The Delta won't thermal throttle under typical consumer workloads.

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Last updated: 2026-05-23. Source: https://ssdrive.net/mushkin-delta-4-tb