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These guys claim to have tested SD vs. CFA on A7IVMine's been fine so far, although in terms of performance I can't say I've noticed much difference over my high speed SD cards. I thought transferring the files on to my computer would be noticeably faster, and whilst I've not done a side by side test I wasn't wowed by the transfer speed. Maybe it's limited by the card reader and/or USB-C port?
Ranking: Best Memory Cards for Sony Alpha 7 IV [CFexpress]
The Sony Alpha 7 IV has two memory card slots: One exclusively for SD memory cards with support for the fast UHS-II protocol and a second slot that accommo...
www.memorycard-lab.com
Ranking: Best Memory Cards for Sony Alpha 7 IV [SDXC]
The Alpha 7 IV takes Sony's full-frame entry onto a new level – especially considering the much higher MSRP than before. The backside-illuminated 35mm sens...
www.memorycard-lab.com
At least on A7IV pergear apparently gives nearly twice the speed as of the kingston.