The Sony a6400 (Amazon/B&H/Adorama) is a mid-range APS-C mirrorless camera that replaces a6300 & a5100. a6400 has 4K video at 30p, has one memory card slot, supports UHS-I SD memory cards. In order max use of a6400, for example shoot 4K video, a fast card is a must. Otherwise, you’ll miss most of your shots waiting for the buffer to clear. There are a lot of great SD memory cards available on the market. Below are a list of top recommended SD memory cards for Sony a6400 APS-C mirrorless camera.
Recommended UHS-I SD memory cards for Sony a6400:
UHS-I memory cards are usually much cheaper than UHS-II memory cards. The fastest UHS-I SD memory cards are from SanDisk and Sony, both has max. read speed at 95 MB/s, and max. write speed at 90 MB/s. Below are recommended UHS-I memory cards for Sony a6400:
| Card | Max. Read Speed | Max. Write Speed | Check Price |
| SanDisk Extreme PRO UHS-I SDXC | 95 MB/s | 90 MB/s | Amazon/B&H/Adorama |
| Sony UHS-I SDXC | 95 MB/s | 90 MB/s | Amazon/B&H/Adorama |
| Delkin Devices Elite UHS-I SDHC | 95 MB/s | 80 MB/s | Amazon/B&H/Adorama |
| Sony High Speed UHS-I SDXC | 90 MB/s | 70 MB/s | Amazon/B&H/Adorama |
| Transcend UHS-1 SDXC | 95 MB/s | 60 MB/s | Amazon/B&H/Adorama |
Recommended UHS-II SD memory cards for Sony a6400:
The fastest & toughest UHS-II SD memory card is Sony’s new SF-G UHS-II Tough SD card, this card has fastest write speed at 299 MB/s. The Lexar Professional 2000x UHS-II SDXC card is one of the best selling UHS-II SD card, it is cheaper than SanDisk Extreme PRO UHS-II SDXC card, yet has the same max read and write speed.
| Card | Max. Read Speed | Max. Write Speed | Check Price |
| Sony SF-G Tough UHS-II SDXC | 300 MB/s | 299 MB/s | B&H/Adorama/Amazon |
| Sony SF-G UHS-II SDXC | 300 MB/s | 299 MB/s | Amazon/B&H/Adorama |
| Lexar Professional 2000x UHS-II SDXC | 300 MB/s | 260 MB/s | Amazon/B&H/Adorama |
| SanDisk Extreme PRO UHS-II SDXC | 300 MB/s | 260 MB/s | Amazon/B&H/Adorama |
| Hoodman Steel 2000x SDXC UHS-II | 300 MB/s | 260 MB/s | B&H/Adorama |
| Delkin Devices Cinema SDXC UHS-II | 280 MB/s | 250 MB/s | Amazon/B&H/Adorama |
| Sony M Series UHS-II SDXC | 260 MB/s | 100 MB/s | B&H/Adorama |
| Lexar Professional 1000x UHS-II SDXC | 150 MB/s | 75 MB/s | Amazon/B&H/Adorama |