Lexar High-Performance 633x 256GB
Score: 60/100
Silicon Power 128GB Micro SD Card
Score: 77/100Rankings
Silicon Power's 128 GB microSDXC delivers solid read/write speeds and A1 app performance, packaged in a waterproof, dust-resistant design with a generous 5-year warranty. Its lack of shockproof rating and limited sustained write speed may restrict demanding 4K workflows. Suitable for mobile creators and drone users who value durability and app speed over top-tier sequential performance.
Lexar's 256 GB 633x microSDXC offers up to 100 MB/s read speed, a V30 rating, and includes a micro-SD to SD adapter for versatile use. Its slower 45 MB/s write speed and lack of waterproofing limit high-end video applications. Suitable for smartphones, tablets and action cameras where large capacity and broad compatibility are priorities.
| Attribute | | |
|---|---|---|
256 GBbest | 128 GB | |
100 MB/sbest | 100 MB/sbest | |
45 MB/s | 80 MB/sbest | |
| ↓ lower better | 453.6 g | 9.07 gbest |
— | 5 yearsbest | |
| ↓ lower better | 1.02 mmbest | 2.54 mm |
Click an attribute name to sort · Green = best, red = worst (relative to this comparison)
| Attribute | | |
|---|---|---|
Storage(1) | ||
Capacity (GB) | 256 GB | 128 GB |
Performance(1) | ||
Write Speed (MB/s) | 45 MB/s | 80 MB/s |
Design(2) | ||
Weight (g) | 453.6 g | 9.07 g |
Thickness (mm) | 1.02 mm | 2.54 mm |
General(1) | ||
Compatibility | wide compatibility with any UHS‑I device while remaining backward compatible with Class 10, V10 and U1 standards | Smartphones, tablets, drones (including DJI Pocket), action cameras, DSLR cameras, 4K/Full HD camcorders, Nintendo Switch |
Products in the top-left offer the best value (high score, low price).
Professional testing shows the Lexar 633x card delivers real-world read speeds near 97 MB/s and write speeds around 69 MB/s, surpassing its advertised specifications and confirming its suitability for 4K video capture. Reviewers acknowledge its solid mid-range performance but point out that newer Lexar BLUE models provide higher peak speeds, making the 633x less compelling for users seeking top-tier throughput.
Everyday users praise the large 256 GB capacity, the included SD adapter for easy file transfer, and the peace of mind from the lifetime warranty. They also highlight the card's reliable 4K video performance and compatibility with a wide range of devices. However, some users note the write speed feels modest compared to newer offerings, and the lack of UHS-II support limits its appeal for high-end professional use.
Professional reviewers note that the card adheres to industry-standard V30 and A1 specifications, delivering read speeds that are competitive for its class and ensuring reliable performance for 4K video capture, though the lack of independent testing leaves some performance claims unverified.
Everyday users rate the card highly, praising its reliable storage for mobile gaming, video recording, and device expansion, while the absence of detailed user complaints suggests general satisfaction.
