Quote from a Nikon interview at digital camera world
"When recording RAW and JPEG at the same time for high-speed continuous shooting, the performance may be degraded if the SD card is a very low-grade one, but there is no significant performance degradation if the customer is using a UHS-II type SD card. So as long as Nikon-recommended cards are used, there will be no significant reduction in performance."
I do not have a Z8 yet - so I cannot test.
"No significant reduction "is not quantified.
jpg are smaller files then NEF.
Perhaps any slight reduction is much smaller than many presume.
"When recording RAW and JPEG at the same time for high-speed continuous shooting, the performance may be degraded if the SD card is a very low-grade one, but there is no significant performance degradation if the customer is using a UHS-II type SD card. So as long as Nikon-recommended cards are used, there will be no significant reduction in performance."
I do not have a Z8 yet - so I cannot test.
"No significant reduction "is not quantified.
jpg are smaller files then NEF.
Perhaps any slight reduction is much smaller than many presume.