Best CFexpress and UHS-II Memory Cards for Sony A7SIII

Sony A7SIII is the latest mirrorless camera in the company’s lineup as of July 2020, and it’s geared towards videographers. It sports a 12MP full-frame sensor that works wonder for video recording but also delivers incredible low-light performance.

The camera can record 4K videos all the way up to 120 fps but it also supports 1080p recording at up to 240 fps. Quite impressive! It has many other useful features including an articulating touchscreen, high-resolution EVF and dual memory card slots. With that in mind, let’s check out some of the best memory cards for A7SIII.

best cfexpress uhs ii sd memory cards sony a7siii

image source: Sony

Best CFexpress Type A and UHS-II SD Cards for Sony A7SIII

Like we already mentioned, this camera comes with two memory card slots. With most cameras, a memory card slot supports only one card type but this isn’t the case with the A7SIII. Both slots support CFexpress Type A card as well as UHS-II SD cards.

Depending on your needs, you may or may not need faster (but more expensive) CFexpress Type A cards. Of course, if you can afford them, definitely grab a couple. However, UHS-II card are a decent option as well although some of them may not be able to handle everything this camera can throw at them. Having said that, here are the best CFexpress Type A memory cards and UHS-II SD cards for A7SIII.

Recommended Memory Cards for 4K Video on Sony A7SIII

There are plenty of frame rates and codecs to choose from on the A7SIII and depending on your preference you may or may not need extremely fast cards. The most demanding codec is definitely the H.264/XAVC S-I 4:2:2 10-Bit. We’ll include the bitrates for this codec below so you can get a picture of the type of writing speeds you’ll need from your memory cards:

  • UHD 4K (3840 x 2160) at 23.976p/25p/29.97p/50p/59.94p [240 to 600 Mbit/s]
  • Full HD (1920 x 1080) at 23.976p/25p/29.97p/50p/59.94p [89 to 222 Mbit/s]

As you can see this codec requires writing speeds of up to 600 Mbit/s or 75 MB/s, which means it’s very data hungry. Slower UHS-II cards won’t be able to handle this and only V90 certified cards (meaning write speeds never drop below 90 MB/s) will be able to handle this codec. Of course, the new CFexpress Type A cards are much faster and will handle it with ease. Overall, if you want to use this camera to its maximum potential, definitely go with CFexpress Type A cards or grab the fastest UHS-II V90 certified cards you can get your hands on.


Sony A7SIII is a great camera for video work and we’re sure it’s going to be a hit among videographers. Hopefully, this article helped you pick the right memory card for your A7SIII mirrorless camera.