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Lexar Professional Dual Slot UHS-II SD/CF Reader Review

Lexar Professional Workflow Dual Slot Card Reader LRW400CRBNA


The Lexar Professional Dual-Slot Reader LRW400U is an update to the Dual-Slot LRW300U CF and SD card reader. It shares the same pop-up case design and adds support for UHS-II SD cards. The reader also supports standard SD, SDHC and SDXC cards including UHS-I and CompactFlash cards up to UDMA 7.

The most notable change is the addition of UHS-II support which requires an extra row of pins to in the reader to interface additional contacts of UHS-II SD cards. As a result SD cards insert slightly over 3/4 inches (20mm) into the reader. Compact Flash cards insert to a similar depth. The fit in both slots is precise and cards insert smoothly and seat with a firm and positive feel. A blue LED illuminates when a card is present and flashes to indicate when a card is in use. The light on the reader was not as bright as the previous model and appeared to be mounted below the window, reducing its visibility.

Lexar Professional Dual Slot Card Reader LRW400CRBNA Closed

Externally, the Dual Slot LRW400U is the same as its predecessor. A translucent outer case surrounds the reader and serves to protect the card slots when the reader is transported. The top portion of the reader is glossy black plastic. The reader is opened by pressing tabs on the sides of the case. Once pressed, the reader opens quickly and closing is as simple as pushing the reader closed until it clicks.

Lexar Professional Workflow Dual Slot Card Reader LRW400CRBNA Bottom

The bottom of the reader is covered in a white rubber to prevent the reader from slipping. A label on the bottom shows the part number LRW400U revision A, the serial number and indicates the reader is made in China. The back of the reader has a micro USB 3 port. A 40-inch USB 3.0 cable is included with the reader. The reader can use a USB 3.0 connection and is backwards compatible with USB 2.0.

Lexar Professional Workflow Dual Slot Card Reader Box LRW400CRBNA Packaging


The Lexar Dual-Slot Reader was tested with a variery of CompactFlash and Secure Digital cards. The Lexar Professional 2000x UHS-II 64GB SDXC measured 268MB/s sequential read speed and 250MB/s write speed. Using UDMA7 CompactFlash cards such as the Lexar Professional 1066x 128GB, the reader reached over 158MB/s read and 155MB/s write speeds. Results using various cards can be viewed in the table below. With UHS-II SD cards the Dual Slot LRW400U was not quite as fast as the Lexar SR2 UHS-II SD card reader. The CF card write speed improved over the previous Dual Slot reader, up from 139MB/s to over 155MB/s with the new reader.

In the Dual Slot reader both cards can be accessed at the same time, although performance was slightly compromised when reading and/or writing two fast card simultaneously. In the best case the sum of concurrent transfers was just over 200MB/s. Copying from one card to the other measured about 90MB/s when using fast UHS-II SD and UDMA 7 CF cards.

Reader: Lexar Professional Dual Slot UHS-II Card Reader
Benchmark: CrystalDiskMark 3.0.3 x64
Program settings: 1000 MB, 5 passes, random test data
Operating system: Windows 10 Pro
Motherboard: Gigabyte GA-Z77X-UD3H
Processor: Intel Core i7-3770K @ 4.40GHz
RAM: 32GB DDR3 1600

Lexar Professional Dual Slot UHS-II Card Reader
Card Benchmarks
Lexar Professional 2000x UHS-II Rev E 32GBSD274.066254.077
Hoodman Steel UHS-II 64GBSD273.637179.489
Lexar Professional 2000x UHS-II Rev E 64GBSD273.565252.760
ProGrade 250MB/s UHS-II V90 64GBSD268.797245.511
Adata Premier One UHS-II V90 64GBSD268.797244.937
Lexar Professional 2000x UHS-II 64GBSD268.762251.517
Transcend Ultimate UHS-II U3 64GBSD266.576181.855
Transcend 700S UHS-II V90 64GBSD266.407199.710
AData Premier One UHS-II V90 256GBSD266.237232.552
Lexar Professional 2000x UHS-II 32GBSD266.035250.406
Angelbird AV Pro V90 64GBSD265.832242.109
Transcend Ultimate UHS-II U3 32GBSD265.328186.264
Toshiba Exceria Pro UHS-II 32GBSD255.252221.312
Toshiba Exceria Pro N502 64GBSD253.616229.749
Lexar Professional 1800x microSD UHS-II 64GBmicroSD250.706207.845
Sony SF-G 300MB/s UHS-II 32GBSD249.483224.222
SanDisk Extreme Pro 300MB/s UHS-II 128GBSD249.098207.331
Sony SF-G 300MB/s UHS-II 64GBSD248.743226.157
Sony M Series UHS-II 128GBSD248.21395.057
Sony SF-G 300MB/s UHS-II 128GBSD247.277225.573
SanDisk Extreme Pro 300MB/s UHS-II 32GBSD246.927209.109
Delkin Power UHS-II V90 128GBSD244.025201.727
Delkin Power 2000x UHS-II V90 64GBSD243.685202.213
Lexar Professional 2000x UHS-II Rev B 128GBSD243.600202.976
Integral UltimaPro X2 UHS-II V90 64GBSD243.317220.683
Lexar Professional 1800x microSD UHS-II 32GBmicroSD243.261204.960
SanDisk Extreme Pro 300MB/s UHS-II 64GBSD243.035204.261
Sony M Series UHS-II 32GBSD242.361114.087
Delkin 1900x UHS-II 32GBSD242.10951.128
Sony Tough UHS-II 64GBSD242.054222.817
Sony M Series UHS-II 64GBSD240.74899.062
SanDisk Extreme Pro 280MB/s UHS-II 32GBSD240.444201.166
Lexar Professional 1800x microSD UHS-II 128GBmicroSD240.004107.293
Verbatim Pro II Plus UHS-II V90 64GBSD239.784210.706
SanDisk Extreme Pro UHS-II 275MB/s microSDXC 64GBmicroSD239.592105.459
Delkin Prime UHS-II V60 64GBSD238.93793.984
Panasonic MicroP2 UHS-II 32GBSD238.06949.155
Lexar Professional 1000x UHS-II Rev C 64GBSD166.33573.817
ProGrade 200MB/s UHS-II V60 64GBSD166.177107.249
Angelbird AV Pro V60 64GBSD165.234108.920
Lexar Professional 1066x 64GBCF159.966152.056
Lexar Professional 800x 64GBCF159.84475.901
Lexar Professional 1066x 32GBCF159.698150.983
SanDisk Extreme Pro 160MB/s 32GBCF159.358147.479
SanDisk Extreme Pro 160MB/s 256GBCF159.213130.876
Komputerbay 1066x 128GBCF158.996151.092
Transcend 1000x 32GBCF158.611131.598
PixelFlash SuperSport 1000X-PRO 128GBCF158.563139.253
Lexar Professional 800x 32GBCF158.39546.075
Lexar Professional 1066x 128GBCF158.276155.644
Transcend 1000x 128GBCF158.085148.776
Toshiba Exceria 1000x 32GBCF158.085123.116
SanDisk Extreme Pro 160MB/s 64GBCF157.633151.990
Toshiba Exceria 1000x 64GBCF157.067118.283
Transcend 800x 32GBCF156.78540.436
Toshiba Exceria Pro 1066x 32GBCF156.178146.306
SanDisk Extreme Pro 160MB/s 128GBCF156.085141.089
Lexar Professional 1000x UHS-II 256GBSD155.57588.012
Lexar Professional 1000x UHS-II Rev C 128GBSD155.27695.725
Lexar Professional 1000x UHS-II 32GBSD154.08988.027
Lexar Professional 1000x UHS-II Rev B 32GBSD153.59385.222
Lexar Professional 1000x UHS-II 64GBSD153.05483.832
Lexar Professional 1000x UHS-II 128GBSD151.59486.104
Toshiba Exceria Pro 1066x 64GBCF151.441147.999
Lexar Professional 1000x microSD UHS-II 32GBmicroSD151.35352.471
Lexar Professional 1000x UHS-II microSD 64GBmicroSD150.76653.203
Lexar Professional 1000x UHS-II microSD 128GBmicroSD144.89158.737
Kingston Ultimate 600x 32GBCF128.628110.284
SanDisk Extreme 120MB/s 32GB Card 2CF124.07783.792
SanDisk Extreme 120MB/s 32GBCF122.44068.768
SanDisk Extreme Plus 100MB/s A1 microSDHC 32GBmicroSD98.10890.637
AgfaPhoto Professional 64GBSD98.07192.126
SanDisk Extreme Pro 95MB/s U3 V30 256GBSD98.05390.138
SanDisk Extreme 100MB/s A1 microSDXC 128GBmicroSD98.01663.949
SanDisk Extreme 90MB/s U3 32GBSD97.99849.452
SanDisk Extreme Plus 100MB/s A1 microSDXC 128GBmicroSD97.97091.085
Kingston Canvas React V30 256GBSD97.90681.525
SanDisk Extreme Pro 95MB/s U3 V30 64GBSD97.88889.837
Kingston Canvas Go! V30 256GBSD97.85181.209
SanDisk Extreme Pro 95MB/s U3 V30 32GBSD97.83390.684
SanDisk Extreme Pro 95MB/s U3 V30 128GBSD97.82491.811
SanDisk Extreme Plus 100MB/s A1 microSDXC 64GBmicroSD97.81590.566
SanDisk Extreme 100MB/s A1 microSDXC 64GBmicroSD97.79771.230
SanDisk Extreme 100MB/s A1 microSDHC 32GBmicroSD97.79771.230
SanDisk Extreme Plus 90MB/s U3 V30 64GBSD97.76965.202
Kingston Canvas React V30 64GBSD97.76982.332
Kingston Canvas React V30 128GBSD97.75181.990
SanDisk Extreme Plus 90MB/s U3 V30 32GBSD97.73366.513
SanDisk Extreme 90MB/s U3 V30 microSDHC 32GBmicroSD97.72471.663
SanDisk Extreme 90MB/s U3 V30 256GBSD97.72464.823
SanDisk Extreme 90MB/s U3 V30 microSDXC 64GBmicroSD97.71571.673
SanDisk Extreme 150MB/s 64GBSD97.70666.181
SanDisk Extreme Pro 95MB/s microSDXC 64GBmicroSD97.70691.451
SanDisk Extreme Plus 95/90 MB/s U3 V30 microSDXC 128GBmicroSD97.69690.739
SanDisk Extreme Plus 95/90 MB/s U3 V30 microSDHC 32GBmicroSD97.68790.668
SanDisk Extreme Plus 95/90 MB/s U3 V30 microSDXC 64GBmicroSD97.68791.523
SanDisk Extreme 90MB/s U3 V30 128GBSD97.66965.981
SanDisk Extreme 150MB/s 128GBSD97.65188.294
SanDisk Extreme Plus V30 A2 microSDXC 128GBmicroSD97.65187.754
SanDisk Extreme 90MB/s U3 V30 32GBSD97.64253.403
SanDisk Ultra 80MB/s 32GB Card 2SD97.64220.666
SanDisk Extreme 90MB/s U3 V30 microSDXC 128GBmicroSD97.64263.751
SanDisk Extreme 90MB/s U3 V30 64GBSD97.62453.978
SanDisk Extreme Pro 95MB/s 64GBSD97.62491.443
SanDisk Extreme Pro 95MB/s microSDHC 32GBmicroSD97.57891.109
SanDisk Extreme Pro 170MB/s 64GBSD97.55188.145
SanDisk Ultra 80MB/s 128GBSD97.55139.171
SanDisk Extreme Pro 95MB/s 128GBSD97.54291.022
SanDisk Extreme Pro 95MB/s 32GBSD97.51589.829
SanDisk Extreme Plus 95/90 MB/s microSD 32GBmicroSD97.47891.331
SanDisk Extreme 90MB/s U3 64GBSD97.46049.484
SanDisk Extreme Plus 80MB/s microSD 32GBmicroSD97.42465.097
SanDisk Ultra Plus V10 A1 microSDXC 128GBmicroSD97.34362.189
SanDisk Extreme Plus 95/90 MB/s microSD 64GBmicroSD97.30791.046
SanDisk Extreme Pro 95MB/s U3 32GBSD97.29890.762
Patriot EP Series V30 A1 microSDXC 128GBmicroSD97.28981.639
Samsung PRO Select microSDXC 64GBmicroSD97.21687.835
SanDisk Extreme V30 A2 microSDXC 256GBmicroSD97.18087.983
SanDisk Extreme 150MB 256GBSD97.15388.101
SanDisk Extreme Pro 95MB/s 256GBSD97.13589.952
SanDisk Extreme 90MB/s microSDHC 32GBmicroSD97.10848.266
SanDisk Extreme V30 A2 microSDXC 400GBmicroSD97.08187.163
SanDisk Extreme Pro 170MB/s 128GBSD97.06387.740
SanDisk Ultra 80MB/s microSD 128GBmicroSD96.97452.671
SanDisk Ultra 80MB/s microSD 64GBmicroSD96.96521.393
SanDisk Extreme Pro 170MB/s 256GBSD96.95687.983
SanDisk Extreme Plus 150MB/s 128GBSD96.95687.410
SanDisk Extreme Plus 150MB/s 64GBSD96.92087.520
Kingston U3 90/80 MB/s 64GBSD96.79584.809
Kingston U3 90/80 MB/s 128GBSD96.78683.333
Polaroid Extreme Performance 95/90 MB/s 64GBSD96.75981.843
Kingston Canvas Go! V30 64GBSD96.72383.036
SanDisk Extreme Plus 90MB/s 32GBSD96.68871.968
Kingston U3 90/80 MB/s 32GBSD96.67989.028
Toshiba Exceria UHS-I Class 3 64GBSD96.67060.759
Verbatim Pro Plus V30 64GBSD96.62583.893
Kingston U3 90/80 MB/s 256GBSD96.62587.214
SanDisk Extreme Plus 80MB/s 32GBSD96.61661.605
Toshiba Exceria Type 2 32GBSD96.60765.561
Kingston Class 10 UHS-I 64GBSD96.54580.772
Panasonic Gold 95/90 64GBSD96.54587.069
Toshiba Exceria UHS-I Class 3 32GBSD96.45661.601
Sony Ultra-High Durability Professional 64GBSD96.34175.934
Toshiba Exceria Pro N401 95/75 MB/s 128GBSD96.29775.973
PNY Pro Elite microSDXC 64GBmicroSD96.27987.019
Toshiba Exceria Pro N401 95/75 MB/s 128GBSD96.25375.578
Toshiba Exceria Type 1 32GBSD96.23586.903
Patriot EP Series microSDXC 64GBmicroSD96.21781.990
Patriot EP PRO microSDXC 64GBmicroSD96.17382.306
Delkin Black 32GBSD96.11180.338
Kingston U3 (90/80) microSD 64GBmicroSD96.10383.154
Samsung PRO Plus 64GBSD96.04188.420
Kingston U3 (90/80) microSD 32GBmicroSD96.00686.616
Samsung PRO Plus 32GBSD95.95387.740
Delkin Elite 633x 32GBSD95.86581.990
Samsung PRO U3 64GBSD95.85778.959
Samsung PRO microSDXC 64GBmicroSD95.84878.545
Samsung EVO Select microSDXC 64GBmicroSD95.83025.454
Samsung PRO Plus microSDXC 64GBmicroSD95.82287.272
PNY Pro Elite 64GBSD95.76086.147
Samsung PRO U3 32GBSD95.70879.383
Patriot EP Pro 90MB/s 32GBSD95.57747.660
Samsung PRO Select microSDXC 64GBmicroSD95.54286.882
Samsung EVO Select microSDXC 256GBmicroSD95.53489.309
PNY Elite Performance U1 32GBSD95.51638.222
Transcend 95/85 MB/s U3 32GBSD95.23988.525
Transcend 600x 64GBSD95.23065.948
Lexar Professional 600x 64GBSD95.21366.742
SanDisk Extreme Plus 80MB/s 64GBSD95.20460.942
PNY Elite Performance U3 128GBSD95.19567.541
Transcend 633x microSDHC 32GBmicroSD95.14388.570
Transcend 95/60 MB/s U3 64GBSD95.14367.324
Lexar Professional 633x U3 256GBSD95.13568.836
Lexar Professional 633x U1 128GBSD95.04028.852
Transcend 95/60 MB/s U3 128GBSD95.04066.712
PNY Elite Performance U3 64GBSD95.01468.566
PNY Elite Performance U3 256GBSD94.99756.321
Sony 94MB/s 32GBSD94.99765.271
Transcend 600x 128GBSD94.98069.323
Transcend R95 W85 U3 64GBSD94.95481.792
Transcend 500S V30 64GBSD94.95468.191
Transcend 500S V30 128GBSD94.92868.258
Gobe Magic 104MB/s 32GBSD94.92888.376
Transcend 95/60 MB/s U3 256GBSD94.92068.342
Sony 95MB/s U3 32GBSD94.91186.975
Transcend 600x 32GBSD94.87739.126
PNY Turbo Performance U3 microSD 32GBmicroSD94.86856.698
Panasonic Gold Series 32GBSD94.85943.765
PNY Elite Performance U1 64GBSD94.85964.964
Lexar Professional 633x U3 128GBSD94.84268.454
Patriot EP Pro 128GBSD94.83442.613
Gobe Magic 104MB/s 64GBSD94.82587.178
PNY Elite microSDXC 128GBmicroSD94.81727.689
Samsung PRO 32GBSD94.79981.323
Patriot EP Pro 90MB/s 64GBSD94.78241.470
Transcend Ultimate 633x microSD 64GBmicroSD94.78287.280
Sony 95MB/s U3 64GBSD94.76586.338
Silicon Power Superior Pro 128GBSD94.75766.298
PNY Elite-X microSDHC 32GBmicroSD94.74876.410
Lexar Professional 633x U1 64GBSD94.72228.720
Lexar Professional 633x microSDXC 64GBmicroSD94.72228.029
Kingston Ultimate 32GBSD94.71446.981
PNY Turbo Performance microSDXC 64GBmicroSD94.71458.760
Lexar Professional 633x U3 32GBSD94.68848.408
Transcend 500S 64GB Card 2SD94.68867.847
Samsung PRO Plus microSDXC 128GBmicroSD94.68041.074
Lexar Professional 633x U1 32GBSD94.54322.286
PNY Elite microSDXC 64GBmicroSD94.53432.154
PNY Elite-X microSDXC 64GBmicroSD94.48372.717
Lexar Professional 633x U3 64GBSD94.48367.772
SanDisk Extreme Plus 90MB/s 64GBSD94.44971.810
Lexar Professional 600x 32GBSD94.41548.208
Samsung PRO 64GBSD94.37382.332
SanDisk Ultra 80MB/s 32GBSD93.62342.806
Kingston Canvas Select 64GBSD93.45623.909
Samsung PRO Select microSDXC 128GBmicroSD92.75383.893
Samsung PRO Plus microSDXC 128GBmicroSD92.69683.866
Toshiba FlashAir W-04 64GBSD92.50876.349
SanDisk Extreme 90MB/s microSDXC 64GBmicroSD92.32943.355
Lexar Professional 633x microSDXC 200GBmicroSD91.10936.314
SanDisk Ultra 90MB/s microSD 200GBmicroSD90.58221.038
Kingston Class 10 256GBSD89.54547.477
SanDisk Extreme 90MB/s U3 128GBSD85.66178.141
SanDisk Extreme 80MB/s 128GBSD84.72779.257
Samsung EVO Plus 128GB microSDXCmicroSD83.98721.917
Lexar Professional 633x microSDXC 128GBmicroSD83.70522.229
SanDisk Extreme 80MB/s 256GBSD82.80078.787
SanDisk Ultra 80MB/s microSD 32GBmicroSD82.45517.544
Samsung EVO Select microSDXC 128GBmicroSD81.65223.254
SanDisk Ultra 80MB/s 64GBSD81.25315.056
SanDisk Extreme 60MB/s 32GBSD74.94654.793
SanDisk Extreme U3 microSD 32GBmicroSD74.55754.084
Lexar Professional 400x 32GBSD71.54643.362
SanDisk Extreme 60MB/s 64GBSD70.91252.410
SanDisk Extreme U3 microSD 64GBmicroSD68.66055.577
Delkin Cinema 1050X 32GB Card 2CF66.349133.526
SanDisk Ultra 50MB/s 32GBCF53.25730.694
SanDisk Extreme 45MB/s 32GBSD47.65844.616
SanDisk Ultra microSD 64GBmicroSD47.60415.361
SanDisk Ultra 40MB/s 64GBSD47.55415.651
Samsung EVO 64GBSD47.54623.641
SanDisk Ultra microSD 32GBmicroSD47.54214.637
Samsung EVO microSD 32GBmicroSD47.46624.563
Samsung EVO microSDXC 64GBmicroSD47.41323.468
Samsung EVO 32GBSD47.37028.720
SanDisk Ultra 40MB/s 32GB Card 2SD47.23519.908
Toshiba NFC 16GBSD37.86813.135

Compatible operating systems include Mac OS X 10.6+ and Windows 8/7. The Dual-Slot Reader is backed by a five-year warranty. The product code for North America is LRW400CRBNA.

Compare prices on the Lexar Professional Dual Slot UHS-II reader. The lowest prices are highlighted in the table below.

Card ReaderConnectionModel NumberPrices
AmazonB&H PhotoAdorama
Lexar Professional Dual Slot UHS-II Card ReaderUSB 3.0LRW400CRBNA$75.99Check price$34.99