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toupac wrote:
I've always been curious. I'm under the assumption that XQD is faster than SD. If you're using both XQD as primary and SD as the backup card, is the camera system speed bottle-necked by the SD card? In other words, does the slower SD card affect the camera's performance when used as backup option?
Yes, but only with regards to buffer depth. XQD is indeed faster than SD UHS-II. You get the same FPS and everything else, just a smaller buffer if the SD slot is part of the equation. One way Nikon is getting these massive buffers, or unlimited in the case of the D5/D500, is harnessing the speed at which you can offload images to the XQD cards. If you take the XQD out of the equation, it slows down to the weakest link which becomes the speed at which it can write to the SD card (around 150MB/s in the case of the D500 - no word on the D850 SD write speeds yet).
If you use SD as overflow instead of backup, there is no penalty until the XQD is full and your images begin writing to the SD card.
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