Product Comparison: Lexar Premium II 300x vs Lexar Professional 633x

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General Specifications
Premium II 300x
Professional 633x
About the Product
Lexar Platinum II 300x SDHC/SDXC UHS-I cards deliver high-speed performance, from start to finish. Designed for advanced photo enthusiasts or anyone who enjoys taking photos, these high-speed, high-capacity cards give you the power to fully leverage the photo and video.
Lexar Professional 633x SDHC/SDXC UHS-I cards let you quickly capture and transfer high-quality photos and 1080p full-HD, 3D, and 4K video, with a read transfer speed up to 633x (95MB/s). The cards leverage UHS-I technology for high-speed, Class 10 performance.
Key Specs
128 GB
128 GB
Bus Type
Read Speed
45 MB/s
95 MB/s
Write Speed
20 MB/s
45 MB/s
What customers say about "Key Specs"
Lexar Premium II 300x 128GB SDXC U1 Memory Card
  • Lots of speed. Great price. Complete winner!
  • The card worked well, and when transferring data from the old card to this one, the speeds were really good.
  • Good card meets speed expectations and as usual Lexar is reliable and rock solid.
  • Works well enough. Not blisteringly fast but meets its advertised speed.
  • Works really well and has a really fast read/write speed.
Lexar Professional 633x 128 GB Class 10 UHS-I Flash Memory Card
  • This card advertises all over its read speed (95MB/s), which is quite good.
  • Good read and write speed, I use it with my Nikon D810 and never suffered from any lag.
  • Excellent product with great transfer speeds.
  • The write speed, is very, very slow (20MB/s)!
  • The read and write speed are slower than I thought with this price.
Size & Weight
1.26 in.
1.25 in.
0.94 in.
0.95 in.
0.08 in.
0.08 in.
0.16 oz.
0.3 oz.
Speed Class
UHS Speed Class
Built-in Write-Protect Switch
High-capacity options, Designed for fast-action photography, High-speed file transfer, Capture high quality images
High-speed file transfer, Temperature Extremes, Capture high quality images, Fast Video Capture
Video Speed Class
What customers say about "Features"
Lexar Premium II 300x 128GB SDXC U1 Memory Card
  • Works great! I bought this for my Pentax K-S2 DSLR. Formatted fine.
  • Pictures / quality looked awesome with really fast speed. Working great.
  • Never had a problem. Class 10 card so you'll receive top speeds.
  • Read/Write speeds are good. Gives up to 5-6 fps on my camera when shooting RAW.
  • This is plenty fast enough to shoot 4K video, and offers great value.
Lexar Professional 633x 128 GB Class 10 UHS-I Flash Memory Card
  • Very good transfer speeds and high quality pictures.
  • This is a great SD card and it's extremely fast.
  • Lexar works great and it solved the problem with a too small SSD disc. The transfer of files is fast and I'm happy.
  • Video features available to take high-quality, stunning images Full-HD 1080p, 3D and 4K video.
  • Stable, reliable and fast enough. Has great features.
Warranty / Certifications
Manufacturer warranty
1 year(s)
1 year(s)
Other Information

Other reviews