# Western Digital SN8100 4 TB: WD's Highest-Shipping Gen5 Capacity (2026)

The Western Digital SN8100 4 TB is the highest-shipping capacity of WD's PCIe 5.0 flagship, pairing a 2,400 TBW endurance cushion with the same 14,900 MB/s peak every reviewer called the fastest consumer SSD they tested.

Quick answer: Buy the Western Digital SN8100 4 TB for a PCIe 5.0-capable desktop when the workload is capacity- and endurance-bound, since the 2,400 TBW cushion and larger pseudo-SLC cache give the SM2508 platform more sustained-write headroom than the 2 TB. Skip it on a PCIe 4.0-only board, where it runs at half speed and a Samsung 990 Pro 4 TB matches its responsiveness at a lower cost, and on a PlayStation 5, whose PCIe 4.0 slot cannot use the Gen5 bandwidth. The honest caveat is that no major outlet has reviewed a dedicated 4 TB unit, so the performance picture is scaled from the 2 TB launch SKU. The closest alternatives are the Kingston Fury Renegade G5 4 TB on the same SM2508 silicon, or the Samsung 9100 Pro 4 TB at the top of the Gen5 stack. The verdict: the highest-endurance shipping SN8100, built for builders who need the room.

## Specifications

| Specification | Value |
| --- | --- |
| Capacity | 4 TB |
| Interface | M.2 5.0 |
| Controller | Silicon Mortion SM2508 |
| Memory type | Kioxia 3D TLC |
| DRAM cache | Yes |
| Sequential read | 14900 MB/s |
| Sequential write | 14000 MB/s |
| Random read IOPS | 2300000 |
| Random write IOPS | 2400000 |
| Endurance | 2400 TBW |
| MTBF | 2000000 |
| Warranty | 5 years |

## Performance

Every independent review of the SN8100 family tested the 2 TB launch capacity, so the 4 TB's real-world characterisation is built on the shared SM2508 platform rather than a dedicated 4 TB review unit. Tom's Hardware titled its 2 TB verdict "the fastest overall consumer SSD ever made," TechPowerUp called it "the fastest and most energy-efficient SSD we have ever tested," TweakTown framed the random-access latency as "approaching Optane," and StorageReview found it "outperforms its competition in most of our benchmarking." WD rates the 4 TB at 14,900 MB/s sequential reads, 14,000 MB/s writes, 2.3 million random read IOPS, and 2.4 million random write IOPS over PCIe 5.0 x4, identical to every other capacity in the family and essentially saturating the Gen5 ceiling.

The 4 TB's genuine edge over its smaller siblings is sustained-write headroom. The reviewed 2 TB held 8 GB/s burst writes until roughly 623 GB filled, about 90 percent of its capacity in SLC mode, then settled to around 4 GB/s direct to TLC with a 2.5 GB/s full-fill average. The 4 TB's larger NAND footprint gives it a proportionally bigger pseudo-SLC cache, so it holds that burst ceiling through a larger window before the direct-to-TLC drop, which matters for anyone moving 100 GB-plus video ingests or full game-library migrations. The leap over PCIe 4.0 is real on sequential bandwidth but modest for game load times, which are bounded by the CPU and asset decompression; a Samsung 990 Pro or WD Black SN850X feels near-identical in most current titles. The SM2508's efficiency edge over Phison E26 holds on the 4 TB as well: at 6.5 W read and 7.0 W write it draws less power, throttles less, and holds rated speed longer than the E26 competition.

## Endurance, TBW & Warranty

WD covers the SN8100 4 TB with a five-year limited warranty, ending early only if the 2,400 TBW endurance rating is exceeded, whichever comes first. That 2,400 TBW figure sits at the top of the shipping family, which scales at 600 TBW per terabyte of Kioxia BiCS8 TLC: 600 TBW on the 1 TB, 1,200 TBW on the 2 TB, 2,400 TBW on the 4 TB, and 4,800 TBW on the announced 8 TB. At a typical consumer workload of around 20 GB of writes per day, the 4 TB would need more than 320 years to exhaust the NAND, so the flash outlasts the warranty term by a wide margin; even a heavier 100 GB-per-day routine still clears six decades. WD rates the drive at up to two million hours MTBF, though StorageReview cites an MTTF of 1.75 million hours for the SN8100; treat either figure as a population-reliability statistic describing expected failures across a large fleet, not a lifespan guarantee for any single unit.

## Pros and Cons

**Pros:**

- 14,900 MB/s sequential reads over PCIe 5.0
- Silicon Motion SM2508 6 nm Gen5 controller
- Kioxia BiCS8 218-layer TLC at 3,600 MT/s
- 2,400 TBW endurance, highest shipping capacity
- Larger pseudo-SLC cache than the 2 TB sibling
- 6.5 W read draw, lower than Phison E26 rivals
- Five-year warranty with NANDXtend ECC
**Cons:**

- No dedicated 4 TB review unit exists
- No heatsink included on the bare SKU
- PCIe 5.0 wasted on PS5 and Gen4 boards
- Modest real-world game gains over PCIe 4.0
- 8 TB capacity announced but not shipping


## Verdict

Buy the Western Digital SN8100 4 TB for a PCIe 5.0-capable desktop when the workload is capacity- and endurance-bound, since the 2,400 TBW cushion and larger pseudo-SLC cache give the SM2508 platform more sustained-write headroom than the 2 TB. Skip it on a PCIe 4.0-only board, where it runs at half speed and a Samsung 990 Pro 4 TB matches its responsiveness at a lower cost, and on a PlayStation 5, whose PCIe 4.0 slot cannot use the Gen5 bandwidth. The honest caveat is that no major outlet has reviewed a dedicated 4 TB unit, so the performance picture is scaled from the 2 TB launch SKU. The closest alternatives are the Kingston Fury Renegade G5 4 TB on the same SM2508 silicon, or the Samsung 9100 Pro 4 TB at the top of the Gen5 stack. The verdict: the highest-endurance shipping SN8100, built for builders who need the room.

## Frequently Asked Questions

### Is the Western Digital SN8100 4 TB good for gaming?

The Western Digital SN8100 4 TB is the fastest class of consumer SSD available, though the real-world gaming gains over PCIe 4.0 are smaller than the spec sheet implies. WD rates the 4 TB at 14,900 MB/s sequential reads and 2.3 million random read IOPS, but game load times are usually bounded by the CPU and asset decompression, so a Samsung 990 Pro or WD Black SN850X feels near-identical in most current titles. The upside is DirectStorage-enabled games that stream large textures straight from the SSD, where the extra bandwidth and low latency translate. The 4 TB's genuine appeal for a gaming rig is capacity: a full library plus headroom for future 200 GB-plus titles, backed by the 2,400 TBW cushion. For a PCIe 5.0 desktop it is a legitimate pick; on a Gen4 board a cheaper drive wins.

### What is the TBW of the Western Digital SN8100 4 TB?

The Western Digital SN8100 4 TB carries a 2,400 TBW endurance rating, the highest of the shipping SN8100 family, which scales at 600 TBW per terabyte of Kioxia BiCS8 TLC: 600 TBW on the 1 TB, 1,200 TBW on the 2 TB, 2,400 TBW on the 4 TB, and 4,800 TBW (4.8 PBW) on the announced 8 TB. At a typical consumer workload of around 20 GB of writes per day, the 4 TB would need more than 320 years to exhaust the NAND, so the flash outlasts the five-year warranty by a wide margin. The 2,400 TBW figure derives from the family's 600 TBW-per-terabyte rate, confirmed in both the TechPowerUp and StorageReview spec tables for the reviewed 2 TB and listed directly in StorageReview's capacity table for the 4 TB. On a write-heavy video or scratch-disk workload the 4 TB's larger cushion is the point of buying it.

### Does the Western Digital SN8100 4 TB work in a PS5?

Technically yes, but it is a poor fit. Sony requires an M.2 NVMe SSD recommending at least 5,500 MB/s sequential reads and fitting within 110 by 25 by 11.25 millimetres with a heatsink, and the Western Digital SN8100 4 TB clears both bars easily. The problem is that the PS5 expansion slot is PCIe 4.0, so this Gen5 drive runs at roughly half its rated speed and the PCIe 5.0 hardware is wasted. A PCIe 4.0 drive like the Samsung 990 Pro 4 TB or WD Black SN850X 4 TB delivers the same PS5 performance at a lower cost, and a Gen5 drive is more hardware than the console usefully exploits. The 4 TB's capacity advantage does carry over, but the 14,900 MB/s peak does not.

### What controller does the WD SN8100 use?

The WD SN8100 uses Silicon Motion's SM2508 eight-channel PCIe 5.0 NVMe controller, built on TSMC's 6 nm process and paired with Kioxia BiCS8 218-layer 3D TLC NAND running at 3,600 MT/s, a discrete Micron DDR4-3200 DRAM cache, SanDisk's nCache 4.0 pseudo-SLC caching layer, and Silicon Motion's NANDXtend ECC. SanDisk rebrands the part as the A101-250800-AC on the SN8100. The SM2508 is the meaningful differentiator against earlier Gen5 flagships: where drives like the Crucial T705 and Seagate FireCuda 540 rely on Phison's PS5026-E26, the SM2508 is tuned for efficiency, and every independent review flags the SN8100's lower power draw and lower thermals as its real advantage over the E26 pack. The Kingston Fury Renegade G5 uses the same silicon, making it the closest platform sibling.

### How does the SN8100 4 TB compare to the Crucial T705?

The two are the closest flagship Gen5 rivals with one real difference: the controller. The SN8100 runs Silicon Motion's SM2508 while the Crucial T705 runs Phison's PS5026-E26, and both pair that controller with TLC NAND and a discrete DRAM cache. On the spec sheet the SN8100's 14,900 MB/s reads slightly exceed the T705's headline, and in real-world game load times the two are effectively tied. The SN8100's genuine advantage is power efficiency: TechPowerUp calls it the most energy-efficient SSD it has tested, and the SM2508's 6.5 W read draw lets it hold peak speeds longer under sustained writes. The T705 has a longer review track record; pick the SN8100 4 TB when efficiency and thermals matter, or the cheaper of the two when both are in stock.

### Does the SN8100 4 TB need a heatsink?

It does need active cooling, and the base SN8100 ships without one in the box. The Silicon Motion SM2508 runs cooler than Phison's E26, but sustained Gen5 writes still push the controller hard enough that a bare drive in a cramped slot can throttle, dropping sequential writes below the rated 14,000 MB/s. Most PCIe 5.0 motherboards ship with a built-in M.2 heatsink that handles this fine, and WD also sells a factory heatsink variant of the SN8100 with an anodized aluminum block, dual thermal pads, and RGB lighting for builders without one. Avoid running any Gen5 drive bare and passive, since thermal throttling not only cuts burst speeds but can shorten the controller's service life under heavy sustained loads.

### Is the SN8100 4 TB faster than the Samsung 990 Pro?

On raw bandwidth, yes, and substantially. The WD SN8100 is a PCIe 5.0 drive rated at 14,900 MB/s reads and 14,000 MB/s writes, against the Samsung 990 Pro's PCIe 4.0 ceiling of 7,450 MB/s reads and 6,900 MB/s writes, so the SN8100 roughly doubles it on sequential throughput. In practice the gap is much smaller: game load times are bounded by the CPU and asset decompression, and the 990 Pro matches the SN8100 in most current titles. The SN8100 pulls ahead on large sequential transfers, DirectStorage-enabled games, and heavy video or scratch-disk workloads, where the 4 TB's larger pseudo-SLC cache also helps. If the use case is pure gaming on a PCIe 4.0 board, the 990 Pro 4 TB is the more honest fit; the SN8100 4 TB only earns its place on a PCIe 5.0 platform.

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Last updated: 2026-07-12. Source: https://ssdrive.net/western-digital-sn8100-4-tb