Western Digital BLACKWESTERN DIGITAL SN850X 1TB 2TB 4TB WESTERN DIGITAL SN580 250GB 500GB 1TB 2TB SSD M.2 2280 Internal Solid State Drive NVMe PCIe 4.0 Game Drive Works
Here’s a detailed comparison table for WD Black SN850X (PCIe 4.0 flagship) and WD Blue SN580 (PCIe 4.0 budget) SSDs:
WD SN850X vs SN580 NVMe SSD Comparison Table
| Specification | SN850X 1TB | SN850X 2TB | SN850X 4TB | SN580 250GB | SN580 500GB | SN580 1TB | SN580 2TB |
|---|---|---|---|---|---|---|---|
| Product Line | Black (Premium) | Black (Premium) | Black (Premium) | Blue (Budget) | Blue (Budget) | Blue (Budget) | Blue (Budget) |
| Form Factor | M.2 2280 | M.2 2280 | M.2 2280 | M.2 2280 | M.2 2280 | M.2 2280 | M.2 2280 |
| Interface | PCIe 4.0 x4 | PCIe 4.0 x4 | PCIe 4.0 x4 | PCIe 4.0 x4 | PCIe 4.0 x4 | PCIe 4.0 x4 | PCIe 4.0 x4 |
| Sequential Read | 7,300 MB/s | 7,300 MB/s | 7,300 MB/s | 4,150 MB/s | 4,150 MB/s | 4,150 MB/s | 4,150 MB/s |
| Sequential Write | 6,300 MB/s | 6,600 MB/s | 6,600 MB/s | 2,000 MB/s | 2,500 MB/s | 4,150 MB/s | 4,150 MB/s |
| Random Read (4K) | 800K IOPS | 1,200K IOPS | 1,200K IOPS | 240K IOPS | 360K IOPS | 480K IOPS | 550K IOPS |
| Random Write (4K) | 1,100K IOPS | 1,100K IOPS | 1,100K IOPS | 420K IOPS | 500K IOPS | 550K IOPS | 600K IOPS |
| NAND Type | 3D TLC | 3D TLC | 3D TLC | 3D TLC | 3D TLC | 3D TLC | 3D TLC |
| DRAM Cache | Yes | Yes | Yes | No (HMB) | No (HMB) | No (HMB) | No (HMB) |
| TBW (Endurance) | 600 TBW | 1,200 TBW | 2,400 TBW | 150 TBW | 300 TBW | 600 TBW | 900 TBW |
| MTBF | 1.75M hours | 1.75M hours | 1.75M hours | 1.75M hours | 1.75M hours | 1.75M hours | 1.75M hours |
| Encryption | AES 256-bit | AES 256-bit | AES 256-bit | AES 256-bit | AES 256-bit | AES 256-bit | AES 256-bit |
| Warranty | 5 years | 5 years | 5 years | 5 years | 5 years | 5 years | 5 years |
| Price (Approx.) | 100−120 | 180−220 | 350−400 | 30−40 | 45−55 | 75−90 | 130−150 |
Two Tiers of Performance for Every Need
Western Digital offers two compelling PCIe 4.0 NVMe SSD options: the flagship Black SN850X (1TB-4TB) for power users and the budget-friendly Blue SN580 (250GB-2TB) for mainstream computing. This comparison highlights their key differences to help you choose the right drive for your needs.
Key Series Comparison
| Feature | WD Black SN850X | WD Blue SN580 |
|---|---|---|
| Target User | Gamers/Content Creators/Pros | Mainstream Users/Budget Builders |
| Max Sequential Read | 7,300 MB/s | 4,150 MB/s |
| Max Sequential Write | 6,600 MB/s | 4,150 MB/s |
| DRAM Cache | Yes | No (HMB technology) |
| NAND Type | 3D TLC | 3D TLC |
| Warranty | 5 years | 5 years |
| Price per GB | Higher (~$0.10/GB) | Lower (~$0.06/GB) |
WD Black SN850X (Premium Performance)
Capacities: 1TB / 2TB / 4TB
Best For:
- 4K/8K video editing
- High-end gaming rigs
- Workstation applications
Key Advantages:
✅ DRAM cache for sustained performance
✅ WD Black Dashboard with gaming mode
✅ Up to 2,400 TBW endurance (4TB model)
✅ DirectStorage optimized
Performance Highlights:
| Capacity | Write Speed | Random IOPS | Endurance |
|---|---|---|---|
| 1TB | 6,300 MB/s | 1.1M | 600 TBW |
| 2TB | 6,600 MB/s | 1.1M | 1,200 TBW |
| 4TB | 6,600 MB/s | 1.1M | 2,400 TBW |
WD Blue SN580 (Budget-Friendly)
Capacities: 250GB / 500GB / 1TB / 2TB
Best For:
- Office PCs
- Casual gaming
- Laptop upgrades
Key Advantages:
✅ Most affordable PCIe 4.0 option
✅ Still 4x faster than SATA SSDs
✅ Low power consumption
Performance Highlights:
| Capacity | Write Speed | Random IOPS | Endurance |
|---|---|---|---|
| 250GB | 2,000 MB/s | 420K | 150 TBW |
| 500GB | 2,500 MB/s | 500K | 300 TBW |
| 1TB | 4,150 MB/s | 550K | 600 TBW |
| 2TB | 4,150 MB/s | 600K | 900 TBW |
Which Should You Choose?
For Gaming/Content Creation:
- SN850X 2TB (Best balance of speed/capacity)
- SN850X 4TB (For 8K video workflows)
For General Computing:
- SN580 1TB (Best value)
- SN580 500GB (Budget builds)
For Laptops:
- SN580 (Better power efficiency)
Technical Comparison
| Aspect | SN850X Advantage | SN580 Advantage |
|---|---|---|
| Speed | 75% faster sequential writes | Good enough for most users |
| Endurance | Higher TBW ratings | Adequate for typical workloads |
| Price | 100−400 | 30−150 |
| Use Case | Demanding professional workloads | Everyday computing |
Final Recommendation
Choose SN850X if you need:
- Maximum PCIe 4.0 performance
- Workstation-level endurance
- Gaming-optimized features
Choose SN580 if you want:
- Affordable PCIe 4.0 speeds
- Reliable everyday performance
- Best bang-for-buck
