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If you are looking at buying an XQD card you must already own a good camera, therefore already understand the read and write speeds, I have a Nikon Z6, when paired with my Tamron 150-600 G2 shooting birds in flight in raw it handles the 12fps no problem, I have not encountered any buffering thus far, when uploading images to my computer using a card reader I pop into the kitchen and make a cup of tea, in that time 2000 raw images have uploaded, thats pretty impressive when you are used to SD cards.
As a professional event photographer for celebrity meet and greet events I punish cameras and memory cards to the limit, but require 100% reliability. This one is very well made, the best I’ve ever experienced in 30 years as a pro photographer. Bit pricey though. But I suspect I’ll only ever need one. Very fast read and write speeds, USB 3 through C is very quick with this.