Lexar High-Performance 633x 256GB
Score: 60/100
SanDisk Ultra Plus 128GB
Score: 81/100Rankings
The SanDisk Ultra Plus 128 GB SDXC UHS-I card offers fast 140 MB/s read speeds and rugged waterproof, shock-proof construction. Its U1 write speed limits suitability for 4K video and high-burst shooting. Ideal for casual photographers needing reliable Full HD 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 | 128 GB | |
100 MB/s | 140 MB/sbest | |
45 MB/s | 140 MB/sbest | |
| ↓ lower better | 453.6 g | 2.27 gbest |
— | 10 yearsbest | |
| ↓ lower better | 1.02 mmbest | 2.1 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(5) | ||
Read Speed (MB/s) | 100 MB/s | 140 MB/s |
Write Speed (MB/s) | 45 MB/s | 140 MB/s |
Speed Class | C10 | Class 10 |
UHS Speed Class | U3 | U1 |
Video Speed Class | V30 | V10 |
Design(3) | ||
Form Factor | microSDXC | SDXC |
Weight (g) | 453.6 g | 2.27 g |
Thickness (mm) | 1.02 mm | 2.1 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.
Professional reviewers consider the SanDisk Ultra Plus 128 GB SDXC a solid choice for photographers and videographers who need fast Full HD transfers and a rugged card. They commend its 140 MB/s read speed, A1 performance class and durable construction, but note the absence of U3/V30 limits its suitability for 4K video.
Everyday users generally express satisfaction with the large capacity and quick transfer speeds, praising its durability for outdoor shooting. Since direct reviews are scarce, no major complaints emerge, though some users are wary of varying speed claims across sellers.
