I suggest you get UHS-II SD cards, check best selling UHS-II SD cards here.

I use SanDisk Extreme Pro SDXC UHS-II, works great on my camera.

Posted by: @p_pp445

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I use SanDisk Extreme Pro SDXC UHS-II, works great on my camera.

I also use this card on my a7C, works stable.

Lexar or SanDisk UHS-II V90 cards are the best choices.

A V90 SD card is an excellent choice for maximizing your camera's capabilities. This high-performance card ensures seamless operation across various functions, eliminating concerns about buffering during still photography or restrictions in video modes. The V90 specification provides ample speed for most modern camera requirements.

Regarding storage capacity, it's advisable to invest in the largest size that fits your budget and needs. This approach offers peace of mind, reducing the frequency of card changes and minimizing the risk of running out of space during crucial shoots. By selecting a high-capacity V90 card, you'll be well-equipped to handle extended photography or videography sessions without interruption.

Lexar Professional V90 UHS-II SD card is also a good choice for a7CII.

Posted by: @thomas

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I suggest you get UHS-II SD cards, check best selling UHS-II SD cards here.

So which brand do you recommend ?

Anyone uses UHS-I SD cards for a7C II ?

Just get SanDisk UHS-II V90 card.

For the Sony a7C II, I recommend using UHS-II V90 cards like the SanDisk Extreme Pro or Lexar Professional 2000X. They provide excellent performance for both stills and video, ensuring smooth operation without buffering issues.

Any V90 cards are OK.

For the best performance with your a7C II, invest in a UHS-II SD card, preferably V60 or V90 rated. While a V60 is generally sufficient, a V90 offers extra headroom for high-bitrate video. Compare card speeds with USB 3.0 transfer rates to optimize your workflow.

UHS-II SD card.