Read 260mb/sec with SanDisk reader. Tested with full hd 10 bit video files on Nikon z6iii. I will come back when tested on 4k.

I am giving it one star because even though they are considered very good cards, the two that I had constantly had errors on my D750 and D780.

No relation to the classic cards. I have worked with many pro cards. This one simply kills it. With Sony a7 lll. It doesn't lag anywhere and incredible build quality.

I took it because it said reading 277/ms. For Raw photos that I use, it reads only 80/ms...!

I have been working for years with the Sony A7iii using the SanDisk 64GB Extreme Pro 170MB/s read and 90MB/s write. I bought two Sony ones for even faster performance. I paid 62 for each one AND regretted it... They are not faster, they are slower... When I edit videos, it takes longer to load them, I have to wait for them to load before I can watch or adjust the brightness... I didn't have this issue with the Sandisk ones. I won't buy them again.

From the most quality cards that exist worldwide for its money.
It transfers data at 270 MBPS in M2.
I recommend it to everyone

Very good cards, the most durable ones you can find, you can tell as soon as you hold them in your hands, the speeds are more or less what the manufacturer claims, you can write 4K up to 140 bits without any problem. They work perfectly with Sony bodies, without any issues for the past two years. They could be cheaper, but they also come with a lifetime warranty, so once you buy them, they are amazing for v60.