Lexar Professional 633x SD cards were introduced in early 2015. Initially the cards had a maximum 45MB/s write speed and UHS Speed Class 3 (U3) for nearly all capacities. U3 rated cards sustain at least 30MB/s for recording HD and 4K video. By mid-2016 the 32, 64 and 128GB capacity cards were updated with a lower U1 speed rating and the maximum write speed quoted by Lexar was downgraded to 20MB/s. The U1 rating only guarantees 10MB/s continuous recording speed. The 256 and 512GB capacity cards still retain the U3 speed rating and 45MB/s write speed according to Lexar. All 633x cards are marked with a 95MB/s speed, which is the read speed only.
The current 633x cards with U3 rating are only offered in 256 and 512GB capacities (Lower capacity cards have U1 speed rating). The card tested for this review is the 256GB capacity SDXC card (LSD256CBNL633). The card is made in Korea.
The 256GB card was benchmarked in several card readers and the highest sequential read speed measured 96.7 MB/s. The highest sequential write speed was 67.4MB/s, well above the 45MB/s speed quoted by Lexar.
Card: Lexar Professional 633x U3 256GB 256 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 256GB 256 GB|
Card Reader Benchmarks
|Lexar LRWM04U-7000 UHS-II Reader||96.732||66.916||59.370||18.526||5.599||1366.8||0.713||174.0|
|Lexar Professional Workflow SR2 UHS-II||96.723||65.750||59.261||20.259||5.536||1351.4||0.708||172.9|
|Kingston MobileLite G4 UHS-II||96.403||66.248||42.336||25.157||5.541||1352.8||0.705||172.2|
|SanDisk Extreme Pro UHS-II SD Reader/Writer||96.315||66.534||44.079||26.588||5.571||1360.2||0.716||174.9|
|Delkin Dual Slot SD UHS-II and CF Card Reader||95.725||66.198||42.750||26.371||5.593||1365.5||0.715||174.7|
|Transcend Multi-Card Reader RDF9||94.722||66.185||43.459||21.951||5.537||1351.9||0.714||174.2|
|Lexar Professional Dual Slot UHS-II Card Reader||94.688||66.257||34.106||22.902||5.603||1368.0||0.692||168.9|
|Delkin Travel Reader||94.637||66.160||85.095||26.930||5.556||1356.4||0.713||174.1|
|Kingston FCR-HS4 Card Reader||94.483||65.028||42.521||24.863||5.521||1347.9||0.711||173.7|
|Sony MRW-E90 XQD 2.0 / SD UHS-II Card Reader||92.680||65.952||83.733||28.905||5.097||1244.4||0.681||166.2|
|Transcend SD Card Reader RDF5 Black||91.691||67.394||83.275||29.015||4.421||1079.3||0.801||195.5|
|SanDisk ImageMate All-In-One USB 3.0||88.938||66.223||74.998||35.823||3.630||886.3||0.788||192.4|
|Transcend Multi-Card Reader RDF8 Black||84.481||66.467||77.929||26.908||5.289||1291.2||0.679||165.8|
|Delkin Universal Memory Card Reader||82.513||65.986||77.660||0.037||4.951||1208.7||0.876||213.9|
The Lexar 633x U3 256GB SDXC card will be included in upcoming camera tests. The write speed in cameras will be added to the table below when results are available.
Cameras tested with this card:
The following table contains information encoded in the SD card.
|Lexar Professional 633x U3 256GB SD — Internal Card Information|
|Serial number (PSN)||2470105321|
|Product Name (PNM)|
|Manufacturer ID (MID)||0x000028|
|OEM ID (OID)||BE|
|Manufacture Date (MDT)||08/2015|
|Total capacity||256,421,920,768 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||$0.61||$38.95||Check price||Check price|
|Lexar Professional 633x U3||128||$0.37||$46.99||Check price||Check price|
|Lexar Professional 633x U3||256||$0.41||$105.98||$105.98||$105.98|
|Lexar Professional 633x U3||512||$0.43||$220.00||$220.00||$220.00|