Lexar High-Performance 633x 256GB
Score: 60/100
Gigastone Micro SD Card 256GB
Score: 85/100Rankings
Gigastone's 256 GB microSDXC delivers fast up to 130 MB/s reads, rugged waterproof and shockproof construction, and broad device compatibility, all with a 5-year warranty. The UHS-I interface caps peak performance and speed claims can be inconsistent, so buyers should verify authenticity. Ideal for budget-conscious creators and gamers who need reliable 4K storage.
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 | 256 GBbest | |
100 MB/s | 130 MB/sbest | |
45 MB/s | 85 MB/sbest | |
| ↓ lower better | 453.6 g | 20 gbest |
— | 5 yearsbest | |
| ↓ lower better | 1.02 mmbest | — |
Click an attribute name to sort · Green = best, red = worst (relative to this comparison)
| Attribute | | |
|---|---|---|
Performance(5) | ||
Read Speed (MB/s) | 100 MB/s | 130 MB/s |
Write Speed (MB/s) | 45 MB/s | 85 MB/s |
Speed Class | C10 | Class 10 |
UHS Speed Class | U3 | UHS‑I U3 |
Interface | UHS-I | UHS‑I |
Design(1) | ||
Weight (g) | 453.6 g | 20 g |
General(1) | ||
Compatibility | wide compatibility with any UHS‑I device while remaining backward compatible with Class 10, V10 and U1 standards | GoPro, Dash Cam, DJI, Drone, Security Camera, Nintendo Switch, smartphones, tablets, PCs, laptops, DSLRs, e-readers |
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 commend the Gigastone 256 GB 4K Pro for its fast read speeds, solid V30/U3 rating, and rugged build, making it a capable choice for 4K video and gaming on a budget. However, they caution that the UHS-I interface limits peak performance, independent benchmarks are lacking, and there are documented counterfeit concerns, which together temper enthusiasm for demanding professional workflows.
Everyday users generally appreciate the card's ability to handle 4K video on devices like GoPro and Nintendo Switch, its quick transfer times, and the peace of mind offered by the free data recovery warranty. Recurring themes include satisfaction with durability and convenience of the included adapter, alongside worries about possible counterfeit units and occasional speed drops when the card fills up.
