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I'm using this in a Sony A7Riii camera and it works there. I tested its performance using a Sony MRW-S1 SDXC II USB3 card reader and the CrystalMark tool on Windows 10, comparing it to a Sony SDXC II card and a SanDisk SDXC I card.

The Amplim came close enough to the rated 285MB/s read speed - I got 271. But the write speed, for which no claim was made, was a third of that at 91MB/s. This surprised me.

Next up was the Sony card, which claims 300/299 read/write, and it delivered 289/257 - fine. The SanDisk card, which claims 90MB/s read (and no write speed is given) delivered 99/50.

Now, 91MB/s is still pretty darned fast, and it's probably adequate for 4K video and high-resolution photography, but write speeds are what limit you if you are trying to dump a lot of data to the card at once (like if I fill the camera's buffer with 10fps 42MP shots), and I would have preferred it to be faster. I think that if I were going to buy another card, I'd probably pay the (considerable) extra for the Sony. But if you're watching your pennies, the Amplim is just fine.

Edit December 22, 2017

I contacted Amplim to ask if the results I saw were expected, and they quickly responded to say that they were. The card meets the SD Association's V60 spec which is more than adequate for 4K video. (The SD Association says it can support 8K video!) The Sony card doesn't claim a V spec. The Amplim card conforms to the new SD 5.0 spec.
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on November 27, 2017
This worked for me on my Panasonic Lumix GH5 at 4K 400Mbs All-i 30fps 4:2:2 in firmware v2.1. I recorded through the entire card which took about 40 minutes today Amplim 128GB UHS-II SD Card: Ultra Fast 285MB/S (1900X), U3, Class 10 High Speed Flash Memory Card for 4K, 8K, Full HD, 3D, HDR, 360 Video. 128 GB / 128G TF SDXC Card. New Nov 2017 with zero crashes. On a lesser card from the same manufacturer, the card crashed within 10-15 seconds. I'm not aware of a review anywhere for any other card that has zero crashes with maximum settings. Interestingly, this card was released by Amplin this month. With all of the confusion regarding what cards work with the GH5, I just had to post my experience to try to help.
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on January 5, 2018
I wanted a second UHS-II high speed sdxc card as a backup for my Lexar 32GB UHS-II sdxc card. Normally I would have just bought another Lexar card, but since they are not currently available I bought the Amplim card, based on its speed ratings. Unfortunately those ratings are not very accurate.

When the card arrived I tested it against both my Lexar UHS-II card and another Lexar, this one a UHS-I card. The Amplim card gave a high speed read rating but a very slow speed write rating.

I have attached 3 screen shots. All are speed tests using the BlackMagic speed test app and each is marked with the card being tested. As you can see the Amplim card tested as reasonably quick when reading but almost as slow as my Lexar UHS-I card when writing and since I bought this card to use in the UHS-II slot in my digital camera it is just too slow to use. I will be returning it.

The speed test images are, from left to right, the Lexar UHS-II card, the Lexar UHS-I card and the Amplim card. All were tested using the same computer, the same UHS-II card reader and the same test software.
review imagereview imagereview image
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on March 11, 2018
Purchased for recording 4K at 400Mbs 4:2:2 10 bit on GH5. Works issues whatsoever. Will purchase again.
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on April 15, 2018
This memory card is quite expensive but if you own DSLR it' a must. It offers super quick upload to and from and performs like a champ when recording videos in the highest resolution. Big thumbs up A+
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on April 6, 2018
This card is perfect for the Panasonic GH5. Using the 400Mb/sec 4K 10bit All-I mode the card never fails. It easily fills the card every time giving the full 1 hour 24 minutes of recording. This is the only 256Gb card I know of that never fails in this mode. It is about the same price as the expensive name brand 128Gb cards, which makes it incredibly cost-effective.
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on May 1, 2018
Purchased for my A7r3, so far so good, is able to keep up with raw conitnuous shooting of 46MP images and 4K30 video!
will buy a second one!

I hope this helps - Mr.J
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on January 8, 2018
Product works as described. Shot 2 full days with it without any problems. Will buy more soon.
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on April 25, 2018
I haven't had any problems with this card in my Nikon camera shooting video. I didn't have any problems with the extreme pro at 95 MB/S either. I am not shooting on 4K, so this card was probably overkill. The price certainly is! Hopefully I will have the need for this in the near future and can update my review.
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Works Great. While I haven't formally measured its speed, I noticed that file transfers to my computer with my old card rated at 90 MB/s (which actually transferred at about 6 MB/s) is about 10X slower than this card. Not sure of its exact speed but it's definitely fast.
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