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Delock SD Express Card Reader

Delock SD Express Card Reader


Delock is a German company offering a variety of IT hardware. Their foray into SD Express includes both cards and card readers. The SD Express reader 91006 supports SD Express (SD7.1) cards as well as UHS-II and UHS-I cards, more on compatibility later.

Delock SD Express Card Reader

The reader supports USB 3.2 Gen 2 and has a USB Type-C connector (USB-C). Delock provides a six month warranty. The reader tested is model 91006 with EAN 4043619910069. The reader is made in Taiwan.

Delock SD Express Card Reader

The reader case is made from aluminum. A card access light is located the back of the reader. The bottom of the reader is covered with a non-slip surface.

Delock SD Express Card Reader Delock SD Express Card Reader

The card reader measures 1.8 x 1.6 x 0.35 inches (45 x 41 x 9mm) not including the USB cable section. The reader includes a one foot (30cm) USB cable.

Inside the reader the Realtek RTL9211 controller handles the USB3.2 Gen2 to PCIe interface and is able to communicate directly with SD Express cards. On the opposite side of the board the Realtek RTS5261 resides, which is able to handle the fallback SDR104 interface for legacy UHS-II and UHS-I cards.

Delock SD Express Card Reader Delock SD Express Card Reader Delock SD Express Card Reader


The Delock SD Express Card Reader was tested using SD Express, UHS-II and UHS-I SD cards. As expected, the highest benchmarks were seen with SD Express cards. The 811.9 MB/s sequential read and 498.7 MB/s sequential write were impressive.

Unfortunately in this reader UHS-II cards are limited to UHS-I mode. Performance of UHS-II and UHS-I cards in the reader reached sequential benchmarks of 55.0 MB/s read and 48.8 MB/s write, which are much lower than expected from the 104MB/s potential offered by SDR104.

There is a problem trying to bridge new and existing technology. Curiously, SD Association's definition states, "SD Express will not support UHS-II interface." This may be due to SD Express cards using the same pins and connectors as existing SD UHS-II cards. SD Express does include support UHS-I interface using the legacy pins (thereby allowing compatibility with numerous existing devices). It may be possible for a card to support both UHS-II and SD Express modes, but the current card controllers from Phison and Silicon Motion do not. Not being able to use SD Express cards at UHS-II speed could be a problem. From a card reader and device perspective, it should be possible to handle both UHS-II and SD Express in the same device. Genesys Logic released specifications for a card reader controller (GL9767) that supports both SD Express (SD 7.1) and UHS-II (SD 4.0), although the current Realtek and JMicron card reader controller solutions do not, as seen in this Delock reader. There is still hope that devices may be compatible with both standards, allowing a smoother transition to the benefits of SD Express without sacrificing UHS-II compatibility.

Reader: Delock SD Express Card Reader
Benchmark: CrystalDiskMark 8.0.4 x64
Program settings: 1000 MB, 5 passes, random test data
Operating system: Windows 11 Pro
Motherboard: Gigabyte Z690 UD AX DDR4
Processor: Intel Core i5 @ 3.30GHz
RAM: 32GB DDR4 3200

Delock SD Express Card Reader
Card Benchmarks
1M Q=8
1M Q=1
1M Q=8
1M Q=1
Delock SD Express 256GB811.904682.256484.316479.640
RitzGear Golden Eagle Express SD 256GB809.701667.814498.732489.823
Samsung Pro Plus 160/120 128GB55.04055.05630.75932.293
Samsung EVO Plus UHS-I 256GB54.93954.84530.17230.108
Silicon Power Superior UHS-I U3 V30 256GB54.93355.00142.56042.338
Kioxia Exceria Pro UHS-II V90 64GB54.72954.62840.25141.001
Samsung Pro Plus 160/120 256GB54.65754.66531.87330.371
Acer SC300 UHS-I 256GB54.63454.59331.18431.365
Angelbird AV Pro V90 64GB54.51554.31839.10538.697
Lexar Professional 1666x UHS-I 256GB54.49054.37632.02832.205
Transcend 340S UHS- I U3 V30 A2 256GB54.47254.58132.91733.126
Sony SF-G 300MB/s UHS-II 64GB54.44854.43144.55144.830
ProGrade 250MB/s UHS-II V90 64GB54.41553.82237.65537.500
Sony SF-G 300MB/s UHS-II 32GB54.26954.30744.41844.598
Lexar Professional 2000x UHS-II Rev E 32GB54.26854.18439.57838.973
Sony SF-G 300MB/s UHS-II 128GB54.26754.25444.01544.026
SanDisk Extreme Pro 170MB/s 512GB54.09854.16640.19440.363
Sony Tough UHS-II 64GB54.06353.61037.69644.038
SanDisk Extreme 180MB/s 256GB54.04553.82239.96139.844
Transcend 700S UHS-II V90 64GB53.89153.84642.69941.851
Kingston Canvas Go! Plus 64GB53.78253.76333.70133.679
Hoodman Steel UHS-II 64GB53.77053.74842.78542.135
SanDisk Extreme Pro 200MB/s 256GB53.68853.34039.60839.377
Acer SC900 UHS-II 256GB53.42853.46435.62034.300
SanDisk Extreme 150MB/s 64GB53.32053.33630.81631.652
Lexar Professional 2000x UHS-II Rev E 64GB53.21253.23138.35036.829
SanDisk Extreme Pro 170MB/s 256GB53.19953.23935.00634.141
ProGrade 200MB/s UHS-II V60 64GB53.15753.13626.58126.402
SanDisk Extreme Plus 150MB/s 128GB53.14953.14634.30732.716
SanDisk Extreme 150MB 256GB53.14153.13535.61735.375
SanDisk Extreme Pro 170MB/s 128GB53.05553.13235.00135.574
Adata Premier One UHS-II V90 64GB53.03052.61136.42536.195
Lexar Professional 1667x UHS-II 256GB53.02052.99831.02531.183
SanDisk Extreme Plus 150MB/s 64GB52.98653.03436.21835.411
Angelbird AV Pro V60 64GB52.98152.90824.30426.153
Integral Ultima Pro 180MB/s 256GB52.79851.52332.03431.580
Integral UltimaPro X2 UHS-II V90 64GB52.61352.52044.35548.100
Lexar Professional 2000x UHS-II Rev B 128GB52.57252.60237.09038.964
SanDisk Extreme Pro 300MB/s UHS-II 64GB52.53752.43339.16443.329
SanDisk Extreme Pro 300MB/s UHS-II 32GB52.42952.41746.51446.677
Verbatim Pro II Plus UHS-II V90 64GB52.42052.10344.20547.296
Delkin Power 2000x UHS-II V90 64GB52.41852.40841.48142.336
Delkin Power UHS-II V90 128GB52.41452.14440.18342.986
SanDisk Extreme Pro 300MB/s UHS-II 128GB52.39952.42341.50643.335
Transcend 500S 64GB Card 251.98351.94035.21535.196
Transcend 500S V30 64GB51.76551.87434.52534.172
AData Premier One UHS-II V90 256GB51.76051.11640.83140.837
Transcend 500S V30 128GB51.72151.75535.02834.600
SanDisk Extreme Pro 170MB/s 1TB51.57951.46636.43836.591
Delkin Prime UHS-II V60 64GB51.05650.61529.50227.411
SanDisk Extreme 150MB/s 128GB50.68950.75735.36935.835
V7 UHS-I V30 A1 64GB50.28450.32427.81427.843
SanDisk Extreme Pro 170MB/s 64GB50.12650.07735.16334.966
Verbatim Pro Plus V30 64GB49.98950.06826.81028.444
Kingston Canvas Select Plus 64GB49.89149.85827.46927.449
Integral UltimaPro X2 260MB/s UHS-II V60 128GB49.68149.27129.50929.297
Kingston Canvas React Plus 64GB49.07049.13344.58144.673
Kodak V90 UHS-II 64GB49.02348.94948.12948.654
PNY Technologies X-PRO 90 UHS-II 64GB49.01849.01347.96948.223
Wise Advanced SD-N UHS-II 128GB48.64248.74348.01048.765
Sabrent Rocket V90 UHS-II 64GB48.42848.16444.00444.161
TeamGroup Xtreem UHS-II U3 V60 256GB47.60148.52329.77429.721


Delock SD Express Card Reader Delock SD Express Card Reader