Head-to-Head ComparisonIndependent Lab Analysis
WD Black SN850X vs WD Black SN770 (2TB)
Executive Verdict:
Flagship with dedicated DRAM cache vs ultra-efficient DRAM-less drive. SN850X reaches 7300 MB/s for extreme loads; SN770 runs noticeably cooler in laptops at 5150 MB/s.
Western DigitalScore: 9.2/10
WD_BLACK SN850X NVMe SSD 2TB
Game Mode 2.0 optimizes texture streaming and loading screens
Verified Retail Price:$154.99
View on AmazonWestern DigitalScore: 8.9/10
WD_BLACK SN770 NVMe SSD 2TB
Incredible power efficiency — runs remarkably cool in thin laptops
Verified Retail Price:$119.99
View on AmazonDetailed Technical Specification Breakdown
| Metric | WD_BLACK SN850X NVMe SSD 2TB | WD_BLACK SN770 NVMe SSD 2TB |
|---|---|---|
| Peak Sequential Read | 7300 MB/s | 5150 MB/s |
| Peak Sequential Write | 6600 MB/s | 4850 MB/s |
| PCB Physical Clearance | Single-sided (Slim fit) | Single-sided (Slim fit) |
| TBW Endurance Rating | 1200 TBW | 1200 TBW |
| Warranty Coverage | 5 Years | 5 Years |
Which Component Should You Buy?
Buy WD_BLACK SN850X NVMe SSD 2TB If:
Choose SN850X for desktop builds, PS5 expansion, and maximum continuous write speeds.
Buy WD_BLACK SN770 NVMe SSD 2TB If:
Choose SN770 for battery-conscious laptop upgrades seeking cool operation and outstanding dollar-per-gigabyte value.