UHS-1 VS UHS-3

How differs the memory card UHS1 vs UHS3 ?

The sigle UHS refers a type of bus interface for memory card.
They differs, by exemple, on the bus speed they provide or by the number of row of pins.
The UHS-3 provide a faster speed bus than the UHS-1 type.
Contrary to the UHS-1, the UHS-3 use two lane for data transfer in his default mode, by using two rows of pins. One lane is use for transfer data from the host to the card and the other lane is use for transferring data from the card to the device. The UHS-3 can reach a maximum speed of bus of 624 Megabytes per second.
UHS-1 use only one row of pin. It can reach a maximum speed of 104 Mb per second.

UHS-1 UHS-3
maximum bus speed MB/s 104 MB/s 624 MB/s
Type of cards SDHC, SDXC, SDUC SDHC, SDXC , SDUC

Type of card concerning by the the bus interfaces UHS-1 and UHS-3 : SDHC, SDXC and SDUC.

 

One point , the notion of UHS class is a maximum speed, it isn’t the effective speed in reality or effectively use by the device. it isn’t too a minimum speed guarantee.

reference :
https://www.sdcard.org/developers/overview/bus_speed/index.html

https://www.sdcard.org/developers/overview/speed_class/index.html

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