ADATA SU650 512GB Internal SSD vs Western Digital WD_BLACK SN770 2TB M.2 NVMe Internal SSD
Buy the WD_BLACK SN770 if you have an M.2 NVMe slot and want speed: its PCIe Gen4 interface reads up to 5,150 MB/s, roughly ten times the SU650's 520 MB/s. Buy the ADATA SU650 only for an older machine with a 2.5-inch SATA bay, where the SN770 will not fit. The SN770 is the faster, newer drive; the SU650 is the compatibility fallback.
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ADATA SU650 512GB Internal SSD
Choose the ADATA SU650 if your PC or laptop has a 2.5-inch SATA bay and no M.2 slot, or you are reviving an older machine on a budget.
- Works in older machines that lack an M.2 slot
- Cheap way to replace a spinning hard drive
- Simple 2.5-inch install with an included guide
- Broad SATA compatibility across brands
- About a tenth the read speed of the SN770
- 512 GB fills fast with games and video
- No NVMe, so no PCIe lane savings or Gen4 throughput
- No DRAM cache listed
What separates them
| ADATA SU650 512GB Internal SSD | Western Digital WD_BLACK SN770 2TB M.2 NVMe Internal SSD | |
|---|---|---|
| Interface | SATA III | PCIe Gen4 NVMe |
| Form factor | 2.5-inch, 7mm | M.2 2280 (also listed as M.2 2230) |
| Sequential read | Up to 520 MB/s | Up to 5,150 MB/s |
| Sequential write | Up to 450 MB/s | Up to 4,900 MB/s |
| Capacity | 512 GB | 1 TB per the listed spec (SN770 line also ships in 2 TB) |
| Caching | 3D NAND, no DRAM listed | nCache 4.0, single-sided design |
| Hardware encryption | Not listed | No 256-bit AES hardware encryption |
| Best fit |
Price history
- ADATA SU650 512GB Internal SSD: lowest $134.60 on Oct 28.
- Western Digital WD_BLACK SN770 2TB M.2 NVMe Internal SSD: lowest $145.98 on Oct 28.
Specs compared
| Spec | ADATA SU650 512GB Internal SSD | Western Digital WD_BLACK SN770 2TB M.2 NVMe Internal SSD |
|---|---|---|
| HD capacity | 512 GB | 1 TB |
| Brand | ADATA | Western Digital |
| Internal/external | Internal | Internal |
| Interface type | SATA | PCI Express |
| Hard drive form factor | 2.5 | 1 Terabytes |
| Read speed | Up to 520 MB/s | 5,150 MB/s |
| Write speed | 450 MB/s | 4900 |
| Model name | SU650 | WDS100T3X0E |
| Dimensions | 3.96 x 2.75 x 0.28 Inches | 3.10 x 0.80 x 0.50 in |
| Weight | 0.1 lb | 0.5 lb |
What reviewers say
ADATA SU650 512GB Internal SSD
Owner feedback on the SU650 line is mixed. Many report a clear speed-up over a hard drive in older machines, while others report early failures or slowdowns under heavy writes.
- Noticeable boot and load-time improvement over a hard drive
- Low price per gigabyte
- Simple install in older laptops
- Reports of drives failing within months
- Write speeds falling below the rating on large transfers
- Limited warranty support experience for some buyers
Western Digital WD_BLACK SN770 2TB M.2 NVMe Internal SSD
Reviewers generally rate the SN770 as a solid value Gen4 drive: fast enough for gaming and everyday use, cool-running, and cheap per gigabyte. The common complaint is that sustained write speeds drop on very large transfers because it lacks DRAM and relies on a cache.
Questions and answers
- Which is faster for gaming?
- The SN770 by a wide margin. Its Gen4 NVMe interface reads up to 5,150 MB/s versus 520 MB/s on the SU650, which cuts game and level load times.
- Will the SN770 fit my laptop?
- Only if the laptop has an M.2 2280 PCIe slot. Many older or budget laptops have just a 2.5-inch SATA bay, where the SU650 fits and the SN770 does not.
- Is the SU650 worth it in 2024?
- For an older SATA-only machine, yes. It is a cheap way to replace a hard drive. For any system with an M.2 slot, the SN770 is the better buy.
- Does the SN770 have hardware encryption?
- No. The listed spec says no 256-bit AES hardware encryption, so rely on software encryption such as BitLocker if you need it.
- How much storage do I get?
- The SU650 is 512 GB. The SN770 listing states 1 TB, though the SN770 line also comes in 2 TB, so check the exact model number before buying.
- Which lasts longer?
- Neither listing states endurance or warranty figures, so compare the rated TBW and warranty on the exact model before deciding.
More comparisons
- Silicon Power P34A60 1TB NVMe PCIe Gen3x4 M.2 2280 Internal Solid State Drive vs Western Digital WD_BLACK SN770 2TB M.2 NVMe Internal SSD
- Silicon Power P34A60 1TB NVMe PCIe Gen3x4 M.2 2280 Internal Solid State Drive vs ADATA SU650 512GB Internal SSD
- A-Tech 16GB Kit (2x8GB) DDR4 3200MHz (PC4-25600) DIMM Desktop PC Memory RAM vs Western Digital WD_BLACK SN770 2TB M.2 NVMe Internal SSD
