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 card is from Lexar, it has max. read speed at 160 MB/s, and max. write speed at 120 MB/s. Below are recommended UHS-I memory cards for Sony a6400:
| Card | Max. Read Speed | Max. Write Speed | Check Price |
| Lexar Professional 1066x UHS-I SDXC | 160 MB/s | 120 MB/s | Amazon/B&H/Adorama |
| SanDisk Extreme PRO UHS-I SDXC | 170 MB/s | 90 MB/s | Amazon/B&H/Adorama |
| SanDisk Extreme UHS-I SDXC | 150 MB/s | 70 MB/s | Amazon/B&H/Adorama |
| Lexar Professional 633x UHS-I SDXC | 95 MB/s | 45 MB/s | Amazon/B&H/Adorama |
| PNY Elite Performance UHS-1 SDXC | 95 MB/s | – | Amazon/B&H/Adorama |
| Transcend UHS-I 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 | Amazon/B&H/Adorama |
| SanDisk Extreme PRO UHS-II SDXC | 300 MB/s | 260 MB/s | Amazon/B&H/Adorama |
| Lexar Professional 2000x 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 | Amazon/B&H/Adorama |
| ProGrade Digital UHS-II SDXC | 300 MB/s | 250 MB/s | Amazon/B&H |
| Delkin Devices Power SDXC UHS-II | 300 MB/s | 250 MB/s | Amazon/B&H |
| Sony SF-M Tough UHS-II SDXC | 277 MB/s | 150 MB/s | Amazon/B&H/Adorama |
| Lexar Professional 1667x UHS-II SDXC | 250 MB/s | 90 MB/s | Amazon/B&H/Adorama |