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Lexar Professional 633x U3 256GB SDXC Memory Card Review

Lexar Professional 633x 256GB UHS-I U3 SDXC Memory Card Front

Introduction

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.

Lexar Professional 633x 256GB UHS-I U3 SDXC Memory Card Back

Performance

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 69.3 MB/s, well above the 45 MB/s speed quoted by Lexar.

Card: Lexar Professional 633x U3 256GB
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
Card Reader Benchmarks
Seq.
Read
1000MB
MB/s
Seq.
Write
1000MB
MB/s
Rand.
Read
512KB
MB/s
Rand.
Write
512KB
MB/s
Rand.
Read
4KB
MB/s
QD1
Rand.
Read
4KB
IOPS
QD1
Rand.
Write
4KB
MB/s
QD1
Rand.
Write
4KB
IOPS
QD1
Rand.
Read
4KB
MB/s
QD32
Rand.
Read
4KB
IOPS
QD32
Rand.
Write
4KB
MB/s
QD32
Rand.
Write
4KB
IOPS
QD32
SanDisk Extreme Pro SD UHS-II Reader/Writer97.84268.98585.26430.7004.1111003.60.798194.85.1971268.80.779190.2
Lexar LRWM04U-7000 UHS-II Reader96.74168.62987.94229.4775.4461329.60.709173.17.1621748.50.874213.3
Lexar Professional Workflow SR2 UHS-II96.74168.91388.45129.0135.6001367.10.711173.67.3341790.40.882215.3
Delkin Dual Slot SD UHS-II and CF Card Reader95.50768.88688.68624.6575.5111345.40.711173.67.3401792.10.882215.2
Kingston MobileLite G4 UHS-II95.46469.03588.50934.6835.5701359.80.788192.47.1911755.70.888216.8
SanDisk Extreme Pro UHS-II SD Reader/Writer95.16168.85888.55339.0505.5051344.10.877214.27.2171761.80.873213.0
Lexar Professional Dual Slot UHS-II Card Reader95.13568.83688.18837.8675.5941365.70.696169.87.3091784.50.855208.7
Transcend Multi-Card Reader RDF995.09268.66088.36329.1895.5431353.20.707172.77.1661749.50.870212.3
Kingston FCR-HS4 Card Reader95.04069.00388.02930.4775.5771361.60.709173.17.1591747.90.876214.0
Delkin Travel Reader94.91168.74685.97727.8315.4761336.80.714174.37.1631748.90.875213.5
Transcend Multi-Card Reader RDF8 Black94.71469.08187.13443.4815.0781239.70.828202.26.6901633.30.821200.3
Delkin Universal Memory Card Reader94.50069.28286.94725.1945.0981244.60.685167.36.7401645.40.859209.7
Transcend SD Card Reader RDF5 Black94.47568.60685.96338.6184.2521038.10.792193.55.0991244.90.778189.8
Sony MRW-E90 XQD 2.0 / SD UHS-II Card Reader92.60667.90983.87224.7315.0661236.80.681166.26.7981659.70.834203.7
SanDisk ImageMate All-In-One USB 3.092.29668.23178.17433.8853.627885.60.771188.24.1521013.60.741181.0

In camera tests, the Lexar 633x U3 256GB SDXC card averaged 52.7 MB/s write speed during continuous shooting in the Nikon D5600. More camera tests are being conducted and the results are added table below when available.

Lexar Professional 633x U3 256GB
Tested in Camera
Write Speed
(MB/s)
Nikon D560052.7
Olympus E-M1 II40.3

Cameras tested with this card: Nikon D5600, Olympus E-M1 II

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)
Product Revision0.2
Manufacturer ID (MID)0x000028
OEM ID (OID)BE
Manufacture Date (MDT)08/2015
Total capacity256,421,920,768 bytes

Available sizes and prices

Compare prices on the Lexar Professional 633x U3 card. The lowest prices are highlighted in the table below. Prices are updated daily.

CardSize
GB
Lowest
$ / GB
Prices
AmazonB&H PhotoAdorama
Lexar Professional 633x U332$1.25$39.95Check priceCheck price
Lexar Professional 633x U364$0.78$49.90Check priceCheck price
Lexar Professional 633x U3128$0.60$76.95Check priceCheck price
Lexar Professional 633x U3256$0.41$109.95$109.95$105.98
Lexar Professional 633x U3512$0.43$249.99$219.95$220.00