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::>Storage devices > 2014 > 05 > Transcend SDXC UHS-I U3

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Transcend 64GB U3 UHS-1 SDXC Card - 64 GB review and testing

From year to year the requirements to capacity of memory cards for portable gadgets constantly increase. Firstly, the memory is constantly becoming cheaper, and its increase doesn’t become expensive. Secondly, there is a more high-quality content occupying a significant amount of space and requiring higher speeds for a comfortable and correct operation.

Market of SD memory card (Secure Digital) is constantly growing. So, initial standard SD 1.0 memory had memory capacity from 8 MB to 2 GB with expansion up to 4 GB for SD 1.1. To storage the memory up to 32 GB standard memory card SDHC (Secure Digital High Capacity) was designed. Its further development was the standard SDXC (Secure Digital eXtended Capacity). The last can boast with capacity from 64 GB to 2 TB, and they are the most relevant to store and record photos and video in high resolution.

Naturally, along with capacity increase the manufacturers are working to improve the speed characteristics to make these devices maximum convenient to use.

Transcend SDXC UHS-I U3 (TS64GSDU3X)

In the current review we will introduce you to 64-GB memory card Transcend SDXC UHS-I U3 that can boast not only by impressive capacity but also high read and write speeds. During testing we’ll check how fast and efficient is a new product in comparison with competing solutions.

The specs:

Producer and model

Transcend SDXC UHS-I U3 

(64-GB TS64GSDU3X version is under testing)

UHS-I support

Class 3

Speed class


Capacity variation, GB

TS64GSDU3X - 64 

TS32GSDU3X - 32

Max read speed, MB/s


Max write speed, MB/s


Durability, connection/disconnection cycles

10 000

Working voltage, V


Working temperature,  C


Overall dimensions, mm

32 x 24 x 2,1

Weight, g


Warranty, year

Limited life assurance

Producer website


Product page

As you can see, the tested memory card supports UHS-I standard which involves the transmission of data on the interface with the rate not less than 50 MB/s. Support of UHS Class 3 provides a minimum speed of writing on a drive of 30 MB/s which is enough for 4K Ultra HD video. Stated by manufacturer speed performance is even higher: up to 95 MB/s at reading and up to 85 MB/s at writing.

Note that in the producer line also includes a solution Transcend SDHC UHS-I U3 (TS32GSDU3X) that has the same high speed, but with different capacity up to 32 GB.

Design and packaging

Transcend SDXC UHS-I U3 (TS64GSDU3X)

The usage in packaging design of black color with golden inscriptions says that inside there is not an entry-level solution. The front side contains the information about the memory card: type (SDXC), capacity (64 GB), the maximum read and write speeds (95 and 80 MB/s), speed class (Class 10), as well as a support of UHS- I Class 3 specification and usage to record 4K Ultra HD-video. 

Transcend SDXC UHS-I U3 (TS64GSDU3X)

The back side of the package contains general information about the product in 21 languages. According to manufacturer words primarily the device is intended for cameras, video cameras, recording devices and automatic GPS-navigators. At the same time the card should be hidden from children, animals and water and heat sources contact. It is important to note that the device has a Limited life assurance. Place of its production is Taiwan.

To the users of Windows 8/7 / Vista / XP and Mac OS 10.5 the manufacturer recommends to download the software RecoveRx which allows recover deleted files from a memory card in a few mouse clicks.

The reminder of the approximate number of stored files is a small table in the upper left corner. According to it, the declared 64 GB capacity is enough to store 26208 5 MP or 13104 10 MP images, as well as 352 hours of video at a resolution of 320 x 240 P, 16 hours of Full HD-video or 4 hours of video content of 4K Ultra HD format.

Transcend SDXC UHS-I U3 (TS64GSDU3X)

Inside the package you can find a memory card on a blister that reliably protects it from damage. Also here is a warranty brochure and a small s guide of Transcend flash drives.

Transcend SDXC UHS-I U3 (TS64GSDU3X)

Transcend SDXC UHS-I U3 (TS64GSDU3X)

Model Transcend SDXC UHS-I U3 (TS64GSDU3X) made in black plastic and has a standard size (32 x 24 x 2,1 mm). On front side there is information about read/write speed, capacity, type, speed class and support of UHS-I Class 3 specification. The reverse side contains a serial number, an indication of the place of production and details of the new items matching EU standards.

Transcend SDXC UHS-I U3 (TS64GSDU3X)

On default the drive is formatted as a single exFAT volume and available capacity is 59.8 GB. Mismatch with the specified 64 GB is connected with decimal transfer of units received binary data instead.

Note that the exFAT file system has a significant advantage over FAT32 as it supports files larger than 4 GB.

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