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Since memory card questions come up on a regular basis especially in the Facebook Groups, I've put together a pretty comprehensive guide that includes in-camera speed tests of 19 different memory cards so far.
You can find all of the results in the blog article:
www.alphashooters.com
Here's a short summary, well as short as I can make it!
For a UHS-II card I'd recommend the Kingston Canvas React Plus UHS-II SDXC. They are only a fraction slower in-camera than the Sony SF-G Tough cards (246 MB/s vs 247 MB/s) but they are typically priced around 40% less for a 64GB card and also include a UHS-II card reader. They are also V90 rated for video.
If you want to shoot in S&Q Mode with the file format XAVC S-I 4k, a record frame rate of 25p/30p and a frame rate of 50fps /60fps then you will need a CFexpress Type A card. The a7 IV will not let you record in this specific format with a V90 card, even though the actual write speed with these settings is within V90 limits, so it's a little odd.
If you shoot a lot of continuous bursts in uncompressed raw format then you will hit the buffer when using the Kingston or Sony SF-G UHS-II cards after only 26 shots, but it clears in 3.85 seconds so it’s rarely an issue. With compressed raw you’ll hit the buffer in around 67 shots. If you shoot JPEGS you’ll never hit the buffer. You’ll need a CFexpress card if you don’t want to hit the buffer shooting compressed or uncompressed raw.
If you shoot simultaneously to both slots you will always be limited by the speed of the slowest card. If you shoot compressed or uncompressed RAW to slot 1 and JPEGS to slot 2 you won't hit the buffer if you use a CFexpress Type-A card in slot 1 and a fast UHS-II card like the Kingston or Sony SF-G in slot 2.
If any of you have some of the older Sony SF-M series, SF-M series TOUGH specification, and SF-G series TOUGH specification SD cards, you might find that they don't work at all in the a7 IV I'm afraid. If you purchased them before the middle of 2020 there's a good chance they won't work. There is a replacement program running for these cards due to a different issue, so I'd suggest replacing them before it expires on Mar. 31, 2022.
It would be good to hear about what cards you are using in your own a7 IV and whether or not you have run into any problems with them.
Please let me know if you have any memory card related questions.
You can find all of the results in the blog article:

Best Sony A7 IV Memory Cards With Speed & Buffer Tests
I've tested over 18 different memory cards in the Sony A7 IV to find out which are the fastest cards in-camera and whether or not CFexpress cards are needed.

Here's a short summary, well as short as I can make it!
For a UHS-II card I'd recommend the Kingston Canvas React Plus UHS-II SDXC. They are only a fraction slower in-camera than the Sony SF-G Tough cards (246 MB/s vs 247 MB/s) but they are typically priced around 40% less for a 64GB card and also include a UHS-II card reader. They are also V90 rated for video.
If you want to shoot in S&Q Mode with the file format XAVC S-I 4k, a record frame rate of 25p/30p and a frame rate of 50fps /60fps then you will need a CFexpress Type A card. The a7 IV will not let you record in this specific format with a V90 card, even though the actual write speed with these settings is within V90 limits, so it's a little odd.
If you shoot a lot of continuous bursts in uncompressed raw format then you will hit the buffer when using the Kingston or Sony SF-G UHS-II cards after only 26 shots, but it clears in 3.85 seconds so it’s rarely an issue. With compressed raw you’ll hit the buffer in around 67 shots. If you shoot JPEGS you’ll never hit the buffer. You’ll need a CFexpress card if you don’t want to hit the buffer shooting compressed or uncompressed raw.
If you shoot simultaneously to both slots you will always be limited by the speed of the slowest card. If you shoot compressed or uncompressed RAW to slot 1 and JPEGS to slot 2 you won't hit the buffer if you use a CFexpress Type-A card in slot 1 and a fast UHS-II card like the Kingston or Sony SF-G in slot 2.
If any of you have some of the older Sony SF-M series, SF-M series TOUGH specification, and SF-G series TOUGH specification SD cards, you might find that they don't work at all in the a7 IV I'm afraid. If you purchased them before the middle of 2020 there's a good chance they won't work. There is a replacement program running for these cards due to a different issue, so I'd suggest replacing them before it expires on Mar. 31, 2022.
It would be good to hear about what cards you are using in your own a7 IV and whether or not you have run into any problems with them.
Please let me know if you have any memory card related questions.