Lexar Professional 633x SD cards are an update to the popular 600x SD cards. The 32GB and larger 633x cards carry the new UHS Speed Class 3 (U3) designation. The U3 specification was created for cards that can write at least 30MB/s continuously to assure they are suitable for 4K video recording.
The new 633x cards offer UHS-I speed up to 95MB/s read and 45MB/s write. The now discontinued Lexar 600x SD cards were previously quoted at 90MB/s write and 45MB/s read. Available capacities include 32, 64, 128 and 256GB. A 16GB version is available but has a lower 20MB/s write speed (U1). The 633x 32GB card is reviewed here.
To test the maximum speed the 32GB 633x card was benchmarked using USB 3.0 memory card readers. The card reached 96.1 MB/s maximum sequential read speed. This is virtually the same as the previous Lexar 600x 32GB card that measured 96.6 MB/s sequential read. Write speed peaked at 49.0 MB/s in sequential benchmark tests. This is essentially the same as the 48.7 MB/s maximum measured in the 600x 32GB card. Both read and write were just above the speeds quoted by Lexar.
Card: Lexar Professional 633x U3 32GB 32 GB
Benchmark: CrystalDiskMark 3.0.3 x64
Program settings: 1000 MB, 5 passes, random test data
Operating system: Windows 8.1 Pro
Motherboard: Gigabyte GA-Z77X-UD3H
Processor: Intel Core i7-3770K @ 4.40GHz
RAM: 32GB DDR3 1600
|Lexar Professional 633x U3 32GB 32 GB|
Card Reader Benchmarks
|Lexar LRWM04U-7000 UHS-II Reader||96.103||48.429||86.831||9.908||6.179||1508.4||1.248||304.7|
|Lexar Professional Workflow SR2 UHS-II||96.094||48.633||86.803||11.975||6.330||1545.4||1.246||304.1|
|Transcend Multi-Card Reader RDF9||95.023||47.479||86.889||11.669||6.292||1536.2||1.243||303.5|
|Delkin Dual Slot SD UHS-II and CF Card Reader||94.945||48.680||87.019||9.043||6.189||1510.9||1.269||309.9|
|Kingston FCR-HS4 Card Reader||94.791||48.896||86.303||8.894||6.205||1515.0||1.242||303.2|
|Lexar Professional Dual Slot UHS-II Card Reader||94.688||48.408||86.118||10.415||5.621||1372.3||1.127||275.0|
|Lexar Professional Workflow SR1||94.586||48.994||85.081||14.494||5.735||1400.0||1.239||302.4|
|Delkin Travel Reader||94.001||47.218||84.120||4.654||6.422||1567.8||1.254||306.3|
|Kingston MobileLite G4 UHS-II||93.900||48.583||86.588||12.205||6.345||1549.1||1.258||307.1|
|Lexar Professional Dual Slot Reader||93.673||48.928||84.758||4.533||5.893||1438.8||1.247||304.5|
|SanDisk Extreme Pro UHS-II SD Reader/Writer||93.506||48.563||86.846||11.299||6.224||1519.5||1.251||305.4|
|Transcend SD Card Reader RDF5 Black||92.549||48.853||84.424||11.561||4.802||1172.4||1.125||274.7|
|Delkin Universal Memory Card Reader||92.410||48.568||83.802||10.520||5.879||1435.2||1.179||287.9|
|Sony MRW-E90 XQD 2.0 / SD UHS-II Card Reader||92.077||48.516||82.248||8.522||5.741||1401.7||1.086||265.2|
|Transcend Multi-Card Reader RDF8 Black||91.667||48.841||84.982||11.354||5.491||1340.6||1.105||269.7|
|SanDisk ImageMate All-In-One USB 3.0||90.880||48.482||76.883||4.656||4.065||992.3||1.080||263.6|
|Kingston Multi-Card Reader FCR-HS3||88.862||46.595||60.752||4.745||6.323||1543.6||1.256||306.6|
In digital camera tests the write speed measured 44.8 MB/s in the Canon Rebel T6s. Additional in camera test results will be added to the chart below.
|Lexar Professional 633x U3 32GB|
Tested in Camera
|Canon 5D Mark IV||45.1|
|Canon Rebel T6i/T6s||44.8|
|Pentax K-3 II||32.5|
|Sony A7R II||31.8|
Other than a new label, there is not much to set this card apart from the previous Lexar 600x cards. This 633x card is currently the highest UHS-I card available from Lexar. For higher write speed Lexar offers UHS-II cards: the Lexar Professional 1000x 32GB and Lexar Professional 2000x 32GB. These cards are backwards compatible with UHS-I and offer higher write speeds of 75MB/s and 95MB/s in UHS-I mode, respectively).
Lexar Professional series memory cards have a limited lifetime warranty and are made in Korea.
The following table contains information encoded in the SD card.
|Lexar Professional 633x U3 32GB SD — Internal Card Information|
|Serial number (PSN)||2433483340|
|Product Name (PNM)|
|Manufacturer ID (MID)||0x000028|
|OEM ID (OID)||BE|
|Manufacture Date (MDT)||03/2015|
|Total capacity||32,026,656,768 bytes|
Compare prices on the Lexar Professional 633x U3 card. The lowest prices are highlighted in the table below. Prices are updated daily.
$ / GB
|Lexar Professional 633x U3||32||$0.94||$29.99||Check price||Check price|
|Lexar Professional 633x U3||64||$0.70||$44.95||Check price||Check price|
|Lexar Professional 633x U3||128||$0.41||$52.01||Check price||Check price|
|Lexar Professional 633x U3||256||$0.41||$103.82||$105.98||$105.98|
|Lexar Professional 633x U3||512||$0.43||$220.00||$220.00||$220.00|