Lexar Professional SD Card 32GB 64GB 128GB 256GB 633x UHS-I Class 10 U3 V10 up to 95MB/s read 70MB/s write SDHC SDXC Memory Card
Lexar quietly downgraded the Professional 633x cards from U3 to U1 speed rating. The new 633x U1 cards are rated at the same 95MB/s read speed, but the write speed is quoted at 20MB/s, rather the the 45MB/s speed advertised with the old cards. The UHS Speed Class 1 (U1) specification means the card will sustain at least 10MB/s write speed in continuous recording applications, such as video. The maximum quoted speed at 20MB/s is a maximum rating given by Lexar under ideal conditions.
The new 633x U1 cards are offered in 16, 32, 64 and 128 GB capacities. The 256 and 512GB cards retain the U3 speed rating. This review covers the 633x U1 64GB SDXC card (LSD64GCB1NL633).
The 64GB 633x U1 card was tested in various USB 3.0 card readers. The highest sequential read speed reached 96.9 MB/s, which is essentially the same as 96.0 MBs measured with the old U3 card. However when it comes to write speed the new U1 card fell short. Sequential write speed reached 29.5MB/s at best, comapred with the 69.3MB/s of the old card it replaces. The downgrade in speed is accompanied by a lower price. Those looking for performance similar to the old 633x U3 card will have to look at the Lexar Professional 1000x U3 UHS-II card.
1 .High-speed performance with high-capacity options
Designed for your mid-range DSLR, HD camcorder, 3D camera, Lexar Professional 633x SDHC/SDXC UHS-I cards let you quickly capture, and transfer high-quality photos of stunning 1080p full-HD, 3D, and 4K video2, with read speeds of up to 633x (95 MB/s)1. These Class 10 cards leverage UHS-I technology to deliver high-speed performance.
2. Capture adventures in 1080p full-HD, 3D, and 4K video
Calling all adventure seekers! Make the most of your adventures in the great outdoors by leveraging the power and performance of these cards. So, whether you’re using a mid-range DSLR, HD camcorder, or 3D camera, you’ll be able to leverage the latest photo and video features available for shooting high-quality images and stunning 1080p full-HD, 3D, and 4K video2.
3. Capture extended lengths of video with high-capacity options
With growing video capabilities, you need high-performance cards you can rely on, and high-capacity options to keep you shooting longer without changing cards.
4. Save time with dramatically accelerated workflow
The high-speed performance of Lexar Professional 633x SDHC/SDXC UHS-I cards dramatically accelerate your workflow from start to finish, so you can save time and get back to the business of photography.
5. Get more from your device
The cards are speed rated at Class 10, and leverage UHS-I technology to deliver a transfer speed up to 95MB/s (633x)1, these high-capacity cards give you the speed and space you need to capture, transfer, and share more adventures on the go.
All Lexar product designs undergo extensive testing in the Lexar Quality Labs, facilities with more than 1,100 digital devices, to ensure performance, quality, compatibility, and reliability.