# Western Digital WD SN5100 2TB Review — Fastest QLC, With Caveats (2026)

TechPowerUp calls the Western Digital WD SN5100 2TB the fastest QLC SSD it has ever tested — 7,100 MB/s reads, 900 TBW of endurance and a 5-year warranty.

Quick answer: The Western Digital WD SN5100 2TB is the capacity to pick in the fastest QLC platform TechPowerUp has ever tested: full 7,100/6,700 MB/s speed, 900 TBW of endurance, five years of warranty and idle draw measured in milliwatts, all in the configuration every major review chose to test. Skip it if the workload is sustained writing — video scratch disks and daily terabyte transfers belong on the WD Black SN7100, which Tom's Hardware called the better drive — and Crucial's P310 wins random-read-heavy desktop duty. For everyone else, this is the rare QLC drive that does not feel like a compromise: as a game library, burst-transfer disk or laptop upgrade, nothing else on four-bit flash comes close.

## Specifications

| Specification | Value |
| --- | --- |
| Capacity | 2 TB |
| Interface | M.2 4.0 x 4 |
| Controller | SanDisk Polaris 3 |
| Memory type | BiCS8 218-layer 3D QLC |
| DRAM cache | No |
| Sequential read | 7100 MB/s |
| Sequential write | 6700 MB/s |
| Random read IOPS | 1000000 |
| Random write IOPS | 1300000 |
| Endurance | 900 TBW |
| MTBF |  |
| Warranty | 5 years |

## Performance

Western Digital rates the 2 TB SN5100 at 7,100 MB/s sequential reads, 6,700 MB/s writes, 1,000K random reads and 1,300K random writes, and this is the capacity with the deepest independent record. StorageReview's instrumented testing measured 7,329 MB/s reads and 6,740 MB/s writes, with 931K random-write IOPS in its fio runs; TechPowerUp's verdict was the fastest QLC drive we have ever tested, placing its behavior alongside the Samsung 980 Pro, Kingston KC3000 and Lexar NM790; Tom's Hardware called it the best QLC SSD it has tested while flagging poor sustained write performance as the one honest con.

The two halves of that verdict explain each other. The nCache 4.0 pseudo-SLC buffer is enormous at this capacity — Tom's Hardware watched roughly 6.45 GB/s hold for more than 78 seconds, a cache exceeding 500 GB — so real-world transfers up to hundreds of gigabytes run at near-rated speed. Empty the cache and the QLC underneath shows: TechPowerUp measured throughput dropping to around 400 MB/s, faster than most QLC competitors but a fraction of TLC drives. Power efficiency earned explicit praise from both Tom's Hardware and StorageReview, with rated draw near 4 watts and 4 milliwatts at idle. For game libraries, boot drives and burst-heavy desktop work, none of the QLC penalty is visible; for daily terabyte-scale writes, it very much is.

## Endurance, TBW & Warranty

The SN5100 2TB carries a 5-year limited warranty rated to 900 TBW of writes, whichever arrives first — the family ladder runs 300 TBW at 500 GB, 600 TBW at 1 TB and 1,200 TBW at 4 TB, so this capacity's per-terabyte allowance (450 TBW) sits below the small models' 600. Nine hundred terabytes absorbs about 120 GB of daily writes for twenty years, a figure no game-library or desktop workload approaches, so the calendar is the practical limit. Tom's Hardware noted the rating is a warranty boundary rather than a NAND failure prediction. The QLC NAND stores four bits per cell and wears faster than TLC, which is why the endurance-per-terabyte story trails the TLC-based SN7100; claims run through Western Digital's standard support channels with proof of purchase.

## Pros and Cons

**Pros:**

- 7,100 MB/s reads and 6,700 MB/s writes rated
- 900 TBW endurance with 5-year warranty
- Fastest QLC verdict in TechPowerUp testing
- pSLC cache exceeds 500 GB on the 2 TB model
- 4 mW idle draw, cool two-chip board
- Above-rating results in StorageReview testing
**Cons:**

- Post-cache writes drop to roughly 400 MB/s
- Random reads trail Crucial's P310
- No DRAM cache; HMB only
- Ships without a heatsink
- TLC-based SN7100 launched cheaper


## Verdict

The Western Digital WD SN5100 2TB is the capacity to pick in the fastest QLC platform TechPowerUp has ever tested: full 7,100/6,700 MB/s speed, 900 TBW of endurance, five years of warranty and idle draw measured in milliwatts, all in the configuration every major review chose to test. Skip it if the workload is sustained writing — video scratch disks and daily terabyte transfers belong on the WD Black SN7100, which Tom's Hardware called the better drive — and Crucial's P310 wins random-read-heavy desktop duty. For everyone else, this is the rare QLC drive that does not feel like a compromise: as a game library, burst-transfer disk or laptop upgrade, nothing else on four-bit flash comes close.

## Frequently Asked Questions

### Is the Western Digital WD SN5100 2TB good for gaming?

Yes — 2 TB is the family's game-library capacity, and the verdicts agree. Tom's Hardware, TechPowerUp and StorageReview all tested this SKU and found burst performance rivaling TLC drives a class above its NAND: installs arrive at multi-gigabyte-per-second rates, load screens stay short, and 2 TB holds an operating system plus a dozen modern titles. The QLC sustained-write penalty exists but almost never applies to gaming, where workloads are read-heavy and installs arrive in bursts the enormous pseudo-SLC cache absorbs at 6.45 GB/s.

### Is the Western Digital WD SN5100 2TB compatible with the PS5?

It meets Sony's published requirements once a heatsink is added. The drive is a PCIe 4.0 NVMe rated at 7,100 MB/s reads — comfortably above Sony's 5,500 MB/s guidance — in an M.2 2280 body within the console's dimension limits, and 2 TB is the standard console-expansion size. SanDisk's product page makes no console claim and the drive ships bare, so a slim aftermarket heatsink is required to satisfy Sony's rules while staying under the 11.25 mm height allowance. With that fitted, it is a sound PS5 expansion.

### How bad are the SN5100's sustained writes after the cache fills?

Slower than TLC, better than QLC tradition. Tom's Hardware's saturation test on the 2 TB model measured roughly 6.45 GB/s holding for more than 78 seconds — the pseudo-SLC cache exceeded 500 GB — before throughput dropped; TechPowerUp then measured around 400 MB/s once the cache was fully exhausted. That post-cache rate beats most QLC competitors but sits far below modern TLC drives. Practical translation: game installs, library moves and even 100 GB-plus transfers finish at full speed; continuous multi-hundred-gigabyte writing eventually drops to hard-drive-adjacent rates until the cache recovers.

### What is the TBW endurance of the Western Digital WD SN5100 2TB?

The 2 TB model is rated at 900 TBW under a 5-year limited warranty, whichever arrives first — the family ladder runs 300, 600, 900 and 1,200 TBW across 500 GB to 4 TB, which puts this capacity at 450 TBW per terabyte versus 600 for the smaller models. At 120 GB of writes per day, the 900 TBW budget stretches past twenty years, so no consumer workload will exhaust it; Tom's Hardware framed the rating as a warranty boundary rather than a failure prediction. Heavy writers wanting more endurance per terabyte should look at the TLC-based SN7100.

### Does the Western Digital WD SN5100 have a DRAM cache?

No — all four capacities are DRAM-less. TechPowerUp's review confirmed the controller uses up to 64 MB of system memory through the Host Memory Buffer for mapping tables, while SanDisk's nCache 4.0 technology operates the hybrid pseudo-SLC write cache that gives the drive its unusually strong burst behavior. For gaming, boot duty and desktop use the design is indistinguishable from DRAM-equipped drives; for sustained writes past the cache it is not, which is the drive's single most documented weakness.

### SN5100 2TB or Crucial P310 2TB?

Two philosophies of QLC. StorageReview's head-to-head found the P310 clearly ahead in random reads (1.16 million versus roughly 415K 4K IOPS in its testing) and slightly cheaper, while the SN5100 edged it on sequential burst and won TechPowerUp's fastest-Q-ever verdict with behavior rivaling the Samsung 980 Pro generation. The SN5100 also carries TCG Pyrite security and a 5-year warranty across the family. Pick the P310 for random-read-heavy desktop responsiveness; pick the SN5100 for large sequential transfers, console upgrades and brand-backed warranty terms.

### SN5100 2TB or WD Black SN7100 2TB?

Same controller family, different flash. The SN7100's TLC gives it better sustained writes, stronger endurance per terabyte (1,200 TBW versus 900 TBW at 2 TB) and Tom's Hardware's explicit better-drive verdict — and it launched cheaper. The SN5100 counters with identical burst ratings on paper and a larger effective pseudo-SLC cache at this capacity, so short transfers feel identical. Choose the SN7100 if the drive will write heavily or prices are close; choose the SN5100 only when it is clearly cheaper per terabyte or when its specific capacity positioning fits the budget.

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Last updated: 2026-09-26. Source: https://ssdrive.net/western-digital-wd-sn5100-2-tb