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The Lexar Professional 1667x is a 64GB UHS-II SDXC card built for cameras that shoot fast bursts and 4K video. It is rated V60, so write speeds stay at or above 60 MB/s, with maximum read speeds up to 250 MB/s and writes up to 120 MB/s. That puts it a step below top-tier V90 UHS-II cards but well above ordinary UHS-I cards, and it costs less than the fastest options. It suits hobbyist and semi-pro photographers and videographers whose cameras can use UHS-II, though in a UHS-I slot it falls back to slower UHS-I speeds.
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Owners generally find the 1667x reliable for burst shooting and 4K video, and see it as good value among UHS-II cards. Some note it is not the fastest UHS-II option and that its speed depends on a UHS-II capable camera.
The Lexar Professional 1667x is a 64GB SDXC memory card that uses the UHS-II bus. It supports DSLR functions such as continuous shutter bursts and rapid shooting, and it handles raw and JPEG captures.
It also records video, including 4K, 3D, and Full HD. Read speeds reach up to 250 MB/s and write speeds reach up to 120 MB/s. The V60 speed class rating means write speeds do not drop below 60 MB/s.
UHS-II cards get their speed from an extra row of pins. The card is designed for cameras that support UHS-II and V60, but it also works in devices that do not. In those devices it defaults to the device's own speed class and bus rating, such as UHS-II and V30 or UHS-I and U3, which each support minimum write speeds of 30 MB/s. If a device does not support U3, the card is compatible with U1 and Class 10, which each guarantee minimum write speeds of 10 MB/s.
