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Lexar Professional 633x U3 32GB SDHC Memory Card Review

Lexar Professional 633x 32GB UHS-I U3 SDHC Memory Card Front

Introduction

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.

Lexar Professional 633x 32GB UHS-I U3 SDHC Memory Card Back

Performance

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
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
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
Lexar LRWM04U-7000 UHS-II Reader96.10348.42986.8319.9086.1791508.41.248304.77.0601723.61.400341.9
Lexar Professional Workflow SR2 UHS-II96.09448.63386.80311.9756.3301545.41.246304.17.0431719.51.413345.0
Transcend Multi-Card Reader RDF995.02347.47986.88911.6696.2921536.21.243303.57.1551746.91.387338.6
Delkin Dual Slot SD UHS-II and CF Card Reader94.94548.68087.0199.0436.1891510.91.269309.97.2051759.11.409344.0
Kingston FCR-HS4 Card Reader94.79148.89686.3038.8946.2051515.01.242303.27.1221738.91.418346.1
Lexar Professional Dual Slot UHS-II Card Reader94.68848.40886.11810.4155.6211372.31.127275.06.3521550.81.265308.9
Lexar Professional Workflow SR194.58648.99485.08114.4945.7351400.01.239302.46.3921560.61.378336.5
Delkin Travel Reader94.00147.21884.1204.6546.4221567.81.254306.37.0971732.61.390339.3
Kingston MobileLite G4 UHS-II93.90048.58386.58812.2056.3451549.11.258307.17.0251715.01.409344.0
Lexar Professional Dual Slot Reader93.67348.92884.7584.5335.8931438.81.247304.56.4621577.61.390339.3
SanDisk Extreme Pro UHS-II SD Reader/Writer93.50648.56386.84611.2996.2241519.51.251305.47.1881754.81.404342.7
Transcend SD Card Reader RDF5 Black92.54948.85384.42411.5614.8021172.41.125274.75.0211225.91.255306.3
Delkin Universal Memory Card Reader92.41048.56883.80210.5205.8791435.21.179287.96.6481622.91.365333.2
Sony MRW-E90 XQD 2.0 / SD UHS-II Card Reader92.07748.51682.2488.5225.7411401.71.086265.26.7131639.01.034252.5
Transcend Multi-Card Reader RDF8 Black91.66748.84184.98211.3545.4911340.61.105269.76.1901511.31.258307.1
SanDisk ImageMate All-In-One USB 3.090.88048.48276.8834.6564.065992.31.080263.64.1421011.31.185289.2
Kingston Multi-Card Reader FCR-HS388.86246.59560.7524.7456.3231543.61.256306.67.0671725.51.411344.4

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
Write Speed
(MB/s)
Canon 80D45.6
Canon 5D Mark IV45.1
Canon Rebel T6i/T6s44.8
Fuji X-Pro243.9
Canon 5Ds42.4
Nikon D50041.8
Fuji X-T1036.2
Olympus PEN-F34.1
Pentax K-3 II32.5
Sony A7R II31.8
Sony A630030.7

Cameras tested with this card: Canon 5D Mark IV, Canon 5Ds, Canon 80D, Canon Rebel T6i/T6s, Fuji X-Pro2, Fuji X-T10, Nikon D500, Olympus PEN-F, Pentax K-3 II, Sony A7R II, Sony A6300

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)
Product Revision0.1
Manufacturer ID (MID)0x000028
OEM ID (OID)BE
Manufacture Date (MDT)03/2015
Total capacity32,026,656,768 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$0.62$39.98Check priceCheck price
Lexar Professional 633x U3128$0.55$70.00Check priceCheck price
Lexar Professional 633x U3256$0.43$132.24$119.95$109.95
Lexar Professional 633x U3512$0.01$6.00$219.95$219.95