Western Digital WD Blue 250GB PCIe 3.0 x4 NVMe M.2 2280
The 250GB WD Blue SN550 delivers 2400 MB/s reads and 2600 MB/s writes over PCIe 3.0 x4, roughly four times faster than SATA, with a DRAM-less TLC design that keeps costs down. Its 150 TBW endurance and 1.7 million hour MTBF, plus the WD SSD dashboard for health monitoring, make it a reliable daily driver. Best for budget-conscious laptop builders or upgraders who need a fast boot drive for everyday tasks without paying a premium.
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Snapshot
The 30-Second Version
A solid budget boot drive that's showing its age. Fine for light use, but the small capacity and cache slowdowns mean it's not the deal it used to be.
Pros & Cons
Pros
- Easy install, even for beginners 87th
- Great value for a boot drive 77th
- Solid random read performance for a DRAM-less drive 71st
- WD's dashboard software is actually useful
Cons
- 250GB capacity is tiny by today's standards
- Performance tanks when the cache fills
- One reviewer had it die after six months
- No DRAM cache means it's not ideal for heavy workloads
What owners think
The Word on the Street
How owner sentiment changed over time
ExclusiveBased on when customers actually wrote their reviews - so you can see whether early praise held up.
Based on 8 dated customer reviews, grouped by calendar quarter. Period analysis is in English.
The proof
Performance
The 2400 MB/s read and 2600 MB/s write speeds are fine for a PCIe 3.0 drive, but they're middle of the pack these days. What surprised us is the random read performance, which is actually pretty strong for a DRAM-less design. The catch is the cache. When it fills up, speeds drop hard because WD used cheaper NAND. For everyday tasks you won't notice, but big file transfers will expose it.
Specifications
Full Specifications
Drive
| Capacity | 250 |
| Form Factor | M.2 2280 |
| Interface | PCIe 3.0 x4 |
| Protocol | NVMe |
| PCIe Generation | 3 |
| External | No |
Performance
| Sequential Read (MB/s) | 2400 |
| Sequential Write (MB/s) | 950 |
| Random Read (IOPS) | 170000 |
| Random Write (IOPS) | 135000 |
Hardware
| NAND | TLC |
| DRAM Cache | No |
Reliability
| Endurance (TBW) | 150 |
| MTBF (hours) | 1700000 |
vs Competition
Against the Samsung 990 PRO or Crucial T500, the SN550 gets smoked. Those are PCIe 4.0 drives with DRAM caches and much higher endurance. But they also cost way more. The real comparison is against other budget drives like the Lexar NM790, which offers better capacity for the money. If you need speed, skip this and get the 990 PRO. If you need cheap storage, the SN550 is fine but the 250GB capacity is a real limitation.
| Spec | Western Digital WD Blue | Samsung 9100 PRO | Kingston FURY Renegade G5 SFYR2S/4T0 | Crucial T500 | SanDisk WD_BLACK SN8100 | Seagate FireCuda 530R |
|---|---|---|---|---|---|---|
| Capacity | 250GB | 8TB | 4TB | 2TB | 8TB | 4TB |
| Form Factor | M.2 2280 | M.2 2280 | M.2 2280 | M.2 2280 | M.2 2280 | M.2 2280 |
| Interface | PCIe 3.0 x4 | PCIe 5.0 x4 | PCIe 5.0 x4 | PCIe 4.0 x4 | PCIe 5.0 x4 | PCIe 4.0 x4 |
| Seq Read | 2,400 MB/s | 14,800 MB/s | 14,800 MB/s | 7,400 MB/s | 14,900 MB/s | 7,400 MB/s |
| Nand Type | TLC | TLC | TLC | TLC | TLC | TLC |
| Dram Cache | false | true | true | true | true | false |
| Endurance | 150 TBW | 4800 TBW | 4000 TBW | 1200 TBW | 4800 TBW | 5050 TBW |
| Compare | Compare | Compare | Compare | Compare |
| Product | Speed | Random | Feature | Capacity | User Sentiment | Endurance | Social Proof |
|---|---|---|---|---|---|---|---|
| Western Digital WD Blue | 46.3 | 77.3 | 53.3 | 12.5 | 28.2 | 70.6 | 86.8 |
| Samsung 9100 PRO Compare | 99.1 | 99.8 | 99.7 | 98.1 | 0 | 85.8 | 95.2 |
| Kingston FURY Renegade G5 SFYR2S/4T0 Compare | 99.4 | 98.7 | 90.4 | 92.5 | 28.2 | 93.4 | 86.8 |
| Crucial T500 Compare | 93.8 | 96.5 | 98.9 | 78.3 | 78.4 | 82.7 | 95.2 |
| SanDisk WD_BLACK SN8100 Compare | 98.9 | 99.1 | 97.3 | 98.1 | 94.5 | 80.6 | 45.2 |
| Seagate FireCuda 530R Compare | 92.5 | 96.4 | 53.3 | 92.5 | 64.6 | 95.6 | 77.4 |
Price
Value & Pricing
At USD 80 to USD 130 across two US listings, the price spread is wider than it should be. The lower end is a decent deal for a budget boot drive, but the higher end is a ripoff when you can get faster PCIe 4.0 drives for similar money. If you're buying, hunt for the cheaper listing. The CAD 278 price in Canada is just sad, don't pay that.
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Overview
The WD Blue SN550 is the budget NVMe drive that made DRAM-less cool. It's not going to win any speed contests against PCIe 4.0 monsters, but for a cheap boot drive or a laptop upgrade, it's still a solid pick. The one thing to know: it's reliable enough for most people, but the 250GB version is small and the cache situation can bite you.
Common Questions
Q: Is this drive good for gaming?
It'll load games faster than a hard drive, but don't expect miracles. The 250GB capacity means you'll only fit a couple of modern titles anyway. For a game library, get something bigger.
Q: Will this work in my laptop?
If your laptop has an M.2 2280 slot with PCIe 3.0 support, yes. It's a standard size and the DRAM-less design actually helps with power consumption, which is nice for laptops.
Q: Is the DRAM-less design a problem?
For everyday use, no. For heavy sustained writes like video editing or large file transfers, yes. The cache fills up and speeds drop significantly. If that's your workload, get a drive with DRAM.
Who Should Skip This
If you're building a new system or need more than 250GB, this isn't it. Go get a 1TB PCIe 4.0 drive like the Lexar NM790 or Crucial T500 instead. The SN550 is for budget upgrades on older machines, not for anyone who needs real capacity or speed.
Verdict
The SN550 is a decent budget boot drive if you can find it at the low end of the price range. It's not exciting, it's not fast by modern standards, and the 250GB capacity is cramped. But for a basic laptop upgrade or a secondary drive, it gets the job done. Just don't expect it to handle heavy sustained writes without slowing down.
