Lexar High-Performance 633x 256GB
Score: 60/100
SanDisk Extreme PRO 128GB
Score: 84/100Rankings
The SanDisk Extreme PRO 128 GB SDXC offers top-tier read performance and rugged durability, making it ideal for 4K UHD shooting and burst photography. Its write speed is modest for sustained high-bitrate video and it carries a premium price. Best suited for professionals needing reliability and fast off-loads without UHS-II support.
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 | 200 MB/sbest | |
45 MB/s | 90 MB/sbest | |
| ↓ lower better | 453.6 g | 2 gbest |
| ↓ lower better | 1.02 mmbest | 2.3 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(3) | ||
Read Speed (MB/s) | 100 MB/s | 200 MB/s |
Write Speed (MB/s) | 45 MB/s | 90 MB/s |
Speed Class | C10 | Class 10 |
Design(3) | ||
Form Factor | microSDXC | SDXC |
Weight (g) | 453.6 g | 2.0 g |
Thickness (mm) | 1.02 mm | 2.3 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.
“perfect for 4K shooting and burst mode”
“elevating creativity”
“stunning high-resolution, stutter-free 4K UHD video”
Professional reviewers from B&H Photo, CDW, and Best Buy commend the Extreme PRO 128GB for its industry-leading 200 MB/s read speed, U3/V30 class compliance, and rugged construction, positioning it as the top UHS-I choice for creators who need fast off-loads and durability.
Consumers consistently praise the card's rapid transfer speeds and dependable performance in harsh environments, rating it highly for 4K video and burst photography.
