In early 2019, Sony released the new Sony a6400 (Amazon/ B&H/ Adorama). It is a mid-range mirrorless camera, featuring a 24.2MP APS-C sensor, 425 phase-detect points auto focus, ‘Real-time Eye AF’ and 11 fps with continuous AF. Sony a6400 has only one SD card slot that supports UGS-I SD memory cards, so if you will make full use of Sony a6400 for 4K video shooting, you must have a fast SD memory card.
Below is our list of best SD memory cards for Sony a6400 mirrorless camera (ranked by write speeds). Just choose the one you like. From the list, you can see Sony SF-G Tough UHS-II SDXC is the fastest & toughest card for Sony A6400 with the fastest write speed at 299 MB/s.
| Memory Card | Max. Read Speed | Max. Write Speed | Check Price |
| Sony SF-G Tough UHS-II SDXC | up to 300 MB/s | up to 299 MB/s | Amazon/ B&H/ Adorama |
| Lexar Professional 2000x UHS-II SDXC | up to 300 MB/s | up to 260 MB/s | Amazon/ B&H/ Adorama |
| SanDisk Extreme PRO UHS-II SDXC | up to 300 MB/s | up to 260 MB/s | Amazon/ B&H/ Adorama |
| Lexar Professional 1000x UHS-II SDXC | up to 150 MB/s | up to 90 MB/s | Amazon/ B&H/ Adorama |
| SanDisk Extreme PRO 128GB UHS-I U3 V30 | up to 170 MB/s | up to 90 MB/s | Amazon/ B&H/ Adorama |
| Kingston Canvas React 128GB UHS-I U3 | up to 100 MB/s | up to 80 MB/s | Amazon/ B&H/ Adorama |
| Sony 64GB UHS-I U3 | 94 MB/s | 70 MB/s | Amazon/ B&H/ Adorama |
| Transcend 64GB UHS-I U3 | 95 MB/s | 60 MB/s | Amazon/ B&H/ Adorama |
| SanDisk Extreme Plus 64GB UHS-I U3 | 90 MB/s | 60 MB/s | Amazon/ B&H/ Adorama |
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