# 4TB at PCIe 5.0 Speeds: Maximum Capacity Without Leaving the Fast Lane (2026)

The Crucial T705 4TB delivers the highest storage capacity in the lineup alongside 14,100 MB/s sequential reads, positioning it as the choice for buyers who need large fast NVMe storage without stepping down to PCIe 4.0 speeds.

Quick answer: The Crucial T705 4TB is the natural choice for buyers who need the largest fast NVMe storage available in the T705 lineup and want PCIe 5.0 performance without accepting PCIe 4.0 speeds. The 3 percent sequential read penalty versus the 2TB model is irrelevant in any real-world context. What matters is that 4TB of dedicated DRAM-cached NVMe storage is available at speeds that outpace every PCIe 4.0 alternative, with 2,400 TBW endurance and a five-year warranty.

## Specifications

| Specification | Value |
| --- | --- |
| Capacity | 4 TB |
| Interface | M.2 5.0 |
| Controller | Phison PS5026-E26 8 channel |
| Memory type | Micron 232-L B58R 3D TLC |
| DRAM cache | Yes |
| Sequential read | 14100 MB/s |
| Sequential write | 12600 MB/s |
| Random read IOPS | 1500000 |
| Random write IOPS | 1800000 |
| Endurance | 2400 TBW |
| MTBF | 2000000 |
| Warranty | 5 years |

## Performance

Crucial rates the T705 4TB at 14,100 MB/s sequential reads and 12,600 MB/s sequential writes, with random performance at 1,500,000 read IOPS and 1,800,000 write IOPS at queue depth 32. These figures are confirmed by Amazon and Newegg product listings for the CT4000T705SSD5 heatsink SKU.

Compared to the 2TB model, sequential reads are 2.7 percent lower (14,100 vs 14,500 MB/s) and sequential writes are 0.8 percent lower (12,600 vs 12,700 MB/s). These differences are consistent with how multi-channel NVMe controllers distribute workloads across different die counts per channel. At 4TB, the NAND configuration favors capacity while maintaining performance within a few percent of the lineup's peak. In practice, the two drives are indistinguishable in sequential workloads.

Random IOPS at low queue depths are strong across all T705 capacities, with the dedicated DRAM cache providing consistent latency. The 4TB model's large NAND pool makes SLC cache exhaustion the least likely scenario in the lineup: a session would need to sustain writes of several hundred gigabytes to exit the SLC layer, at which point direct TLC write speeds apply — normal behavior for all TLC-based SSDs regardless of PCIe generation.

Full rated performance requires a PCIe 5.0 x4 M.2 slot, available on Intel 12th Gen and newer platforms with appropriate motherboard support, and AMD Ryzen 7000 series and newer. In a PCIe 4.0 slot the drive operates at PCIe 4.0 speeds — functional but well below the rated maximum.

## Endurance, TBW & Warranty

The Crucial T705 4TB is covered by a five-year limited warranty from the date of original purchase, with a 2,400 TBW endurance rating on the 4TB model. The warranty applies until the drive reaches 2,400 TBW or five years have passed — whichever comes first. At 2,400 TBW, the drive accommodates up to 480 TB written per year across the warranty period. A user writing 200 GB per day — a heavy content creation or development workload involving frequent large file writes — accumulates roughly 73 TB per year, reaching the TBW threshold in approximately 33 years. Even at 1 TB written per day, the 2,400 TBW budget lasts over six years. The five-year warranty expiration is the operative limit for the overwhelming majority of buyers. MTBF is rated at 2 million hours.

## Pros and Cons

**Pros:**

- 14,100 MB/s sequential reads — within 3 percent of the lineup's peak, with the largest capacity available
- 12,600 MB/s sequential writes — matches the 2TB model closely despite the larger NAND pool
- 2,400 TBW endurance — the highest in the T705 lineup, appropriate for heavy and sustained write workloads
- Five-year warranty with MTBF of 2 million hours
- Phison PS5026-E26 8-channel controller with dedicated DRAM across all SKUs
- Large SLC write cache due to larger NAND pool — less likely to exhaust cache in typical sessions
**Cons:**

- Sequential reads (14,100 MB/s) are marginally lower than the 2TB model (14,500 MB/s) — a known trade-off at maximum capacity
- Requires a PCIe 5.0 x4 M.2 slot; PCIe 4.0 hosts deliver roughly half the rated sequential throughput
- Premium pricing over both smaller T705 variants and all PCIe 4.0 4TB alternatives
- PCIe 5.0 thermal output is higher than PCIe 4.0; a quality heatsink is necessary for sustained workloads
- Corsair MP700 PRO SE 4TB offers a higher TBW (3,000 vs 2,400) at similar sequential speeds — worth comparing at purchase time


## Verdict

The Crucial T705 4TB is the natural choice for buyers who need the largest fast NVMe storage available in the T705 lineup and want PCIe 5.0 performance without accepting PCIe 4.0 speeds. The 3 percent sequential read penalty versus the 2TB model is irrelevant in any real-world context. What matters is that 4TB of dedicated DRAM-cached NVMe storage is available at speeds that outpace every PCIe 4.0 alternative, with 2,400 TBW endurance and a five-year warranty.

Buyers who should choose the 2TB instead: those who do not need 4TB of storage and prefer the fractionally higher peak sequential speeds at a lower price. Those for whom the 4TB is the right call: content creators who fill storage quickly, developers with large project and container footprints, and users who want to run their entire game library and working storage from a single fast NVMe drive without running out of space.

## Frequently Asked Questions

### Why is the T705 4TB slightly slower than the 2TB in sequential reads?

The 4TB T705 is rated at 14,100 MB/s sequential reads versus 14,500 MB/s for the 2TB. The difference comes from how the Phison E26 controller distributes NAND dies across its eight channels. At 4TB, more dies per channel at a specific interleaving ratio optimizes for capacity and endurance rather than peak sequential throughput. The 3 percent read speed difference is measurable in a benchmark but not perceptible in real-world transfers. Sequential write speeds differ by less than 1 percent between the two models.

### How much can I write to the Crucial T705 4TB before the warranty voids?

The 4TB T705 carries a 2,400 TBW endurance rating under a five-year warranty. Writing 200 GB per day — a demanding content creation workload — produces about 73 TB per year, reaching 2,400 TBW in approximately 33 years. Even writing 1 TB per day, the TBW budget lasts over six years. For virtually every buyer, the five-year warranty expiration is the practical limit, not the endurance rating.

### Is the Crucial T705 4TB a good choice for a gaming PC?

Yes, with a qualification: current games do not come close to saturating the T705's 14,100 MB/s reads. The performance advantage over a high-end PCIe 4.0 drive like the Samsung 990 Pro or WD Black SN850X is real in sequential benchmarks but rarely felt in gaming. The stronger case for the T705 4TB in a gaming context is capacity — 4TB is enough to store a large library without archiving — combined with fast load times that benefit from high sequential read speeds as game assets grow in size.

### Does the T705 4TB come with a heatsink?

Crucial sells the 4TB T705 in two configurations: CT4000T705SSD3 is the bare drive without a heatsink, and CT4000T705SSD5 is the heatsink variant with a copper-and-aluminum design. PCIe 5.0 SSDs run warmer than PCIe 4.0 equivalents under sustained load. If your motherboard has a quality built-in M.2 heatsink, the bare drive is sufficient. If your M.2 slot is uncovered or relies on only a thin thermal pad, the heatsink SKU is the better choice for avoiding thermal throttling.

### How does the T705 4TB compare to the Corsair MP700 PRO SE 4TB?

Both drives use the Phison PS5026-E26 8-channel controller and Micron 232-layer TLC NAND, and both target similar sequential speeds. The Crucial T705 4TB is rated at 14,100 MB/s reads and 12,600 MB/s writes; the Corsair MP700 PRO SE 4TB reaches 14,000 MB/s reads and 12,000 MB/s writes. The Corsair carries a higher TBW of 3,000 versus the Crucial's 2,400. In real-world benchmarks, both drives perform within two to three percent of each other. Price at time of purchase and availability typically drive the choice between them.

### Will the T705 4TB work in a PCIe 4.0 motherboard?

Yes. The T705 is backwards-compatible and operates in a PCIe 4.0 x4 M.2 slot at PCIe 4.0 speeds — roughly 7,000 MB/s sequential reads. It is fully functional at those speeds; you simply will not reach the 14,100 MB/s rating. If you plan to upgrade to a PCIe 5.0 platform in the near future, installing the drive now and running it at PCIe 4.0 speeds until then is a reasonable approach. Confirm your motherboard M.2 slot generation before purchasing to set accurate performance expectations.

### Is 4TB overkill for most users?

That depends entirely on use case. For a general desktop or gaming system where a 1TB or 2TB drive holds the OS, applications, and active games, 4TB is more than needed. For content creators managing large video projects, audio libraries, or raw photo archives; developers running many containers, VMs, or build caches; or users who want a single large NVMe drive for their entire workflow — 4TB at PCIe 5.0 speeds is a purposeful choice rather than overkill.

### Does the T705 support hardware encryption?

The Crucial T705 4TB supports AES 256-bit hardware encryption via the Phison E26 controller. This means encryption operations are handled by the drive's dedicated hardware rather than the CPU, avoiding the performance penalty of software-based encryption. The drive is also Microsoft eDrive compatible for BitLocker hardware acceleration when used on supported platforms.

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Last updated: 2026-06-13. Source: https://ssdrive.net/crucial-t705-4-tb