Lexar High-Performance 633x 256GB
Score: 60/100
Samsung EVO Select 512GB
Score: 78/100Rankings
Samsung EVO Select 512GB provides ample high-capacity storage with solid UHS-I performance up to 100 MB/s read and 90 MB/s write, plus robust durability features. However, write speeds can fluctuate and the warranty excludes intensive write-heavy uses. It's a good fit for casual users seeking large capacity at a value price.
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 GB | 512 GBbest | |
100 MB/sbest | 100 MB/sbest | |
45 MB/s | 90 MB/sbest | |
| ↓ lower better | 453.6 g | 0.25 gbest |
— | 1 yearsbest | |
| ↓ lower better | 1.02 mm | 1 mmbest |
Click an attribute name to sort · Green = best, red = worst (relative to this comparison)
| Attribute | | |
|---|---|---|
Storage(1) | ||
Capacity (GB) | 256 GB | 512 GB |
Performance(3) | ||
Write Speed (MB/s) | 45 MB/s | 90 MB/s |
Speed Class | C10 | U3 |
UHS Speed Class | U3 | UHS-I |
Design(2) | ||
Weight (g) | 453.6 g | 0.25 g |
Thickness (mm) | 1.02 mm | 1 mm |
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.
“gobs of storage”
Professional reviewers commend the EVO Select for delivering reliable UHS-I performance and solid value, especially for 4K video and app storage, while noting that its write speeds fall short of premium alternatives and can vary with the host device.
Everyday users generally praise the card's large capacity, fast reads, and included adapter, highlighting smooth 4K recording and quick transfers, though some express disappointment with slower writes on older devices and the warranty's write-intensive exclusions.
