The Lexar 1667x is a new card by Longsys that sits somewhere between the Lexar2000x and the Lexar1000x. This card would be ideal for 4k video shooters with lower bitrate cameras that only shoot 4k at around 100Mbps. Often, the slower cards like the Lexar 1000x can encounter minor buffer issues that this slightly faster card solves.
Lexar is no longer a Micron company, and it seems that its quality control has slipped. Because of this, I no longer consider Lexar a top-tier brand. However, because of their value, they can be a really good buy.
If you want the best memory card for your specific camera, check out the memory card speed tests for some great recommendations.
Lexar 1667X UHS-II Memory Card Sizes
The Lexar 1667x is available in three sizes – 64GB, 128GB, and 256 GB.
| Memory Card Name | 64GB | 128GB | 256GB |
| Lexar 1667x UHS-II | Amazon | Amazon | Amazon |
| Adorama | Adorama | Adorama | |
| BHphoto | BHphoto | BHphoto |
Real-World Memory Card Performance
The Lexar 1667x UHS-II performs well with USB-C memory card readers in Windows 10. This card performs about the same as other v60 cards and should be considered an upgrade from the 1000x which only writes at UHS-I speeds but reads closer to UHS-II speeds.
The Lexar 1667x has a write speed of around 104MB/s and a read speed that is also very good which means it’s a great card for video shooters or even photographers that don’t always need the maximum speed that UHS-II sometimes offers.
Check how this card performs in your camera by looking at the camera memory card tests to make sure it doesn’t have any compatibility issues.
| Memory Card Name | USB-C Read | USB-C Write |
| Lexar 1667x UHS-II 64GB | 265.8 MB/s | 104.2 MB/s |
Compatibility
Lexar only makes these cards in sizes 64GB and larger. You will want to be careful using this card with some of the high bitrate rate 4k cameras since it might not perform properly. If you own a high bitrate 4k camera you may want to upgrade to something a little faster or more reliable.
Speed Class: U3 / Class 10
UHS-I / UHS-II devices
Reliability
Limited Lifetime Warranty
UHS-II USB 3.0 Memory Card Readers
Lexar cards sometimes come with USB 3.0 memory card readers but USB-C readers are on the market now and they do perform a little better with some cards.
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This review is CHEATED, don’t buy this memory card if You wish to download data fast to Your computer.
I tested my Lexar 1667x 128GB SDXC UHS-II/U3 with two memory card readers:
1. Sandisk Imagemate Pro – 180MB/s read speed
2. Kingston FCR-HS4 – 170 MB/s read speed
As You can see BOTH readers in real life are far away from claimed 250 MB/s. This card achieves 250MB/s only for first one second but when Your file is big – say 1,4GB then card slows down transfer speed when clock is ticking. So please do not trust “synthetic testing” with some fishy Crystal Disk Mark software because it is very misleading.