Here are the top recommended (fastest) SD memory cards for Sony a9 mirrorless camera.
The Sony a9 mirrorless camera comes with 24.2MP Full-Frame Sensor, 693-Point AF System & 20 fps Shooting, Internal UHD 4K Video Recording and Dual SD Slots: card slot 1 is compatible with ultra-fast UHS-II SD memory cards while Card Slot 2 is compatible with UHS-I memory cards. If you want to shoot 4K video with the Sony a9, a fast UHS-II SD memory card is a must. But NOT all UHS-II cards have excellent performance: the Write Speed matters, and the Write Speed is the key: Fast write speed provides fast buffer clearing time between burst shots optimizing your shooting experience. Fast read speed can let large files such as 4K video or a bunch of high-resolution images by continuous shooting transfer to PC in seconds.
And, if you plan to shoot videos, stick to 64GB or 128GB (or larger) SDXC cards for the best video codex.
Below are the top recommended memory cards for Sony a9, just choose the one you need!
A+! If you want to shoot sports, action, DCI, and UHD 4K, you need a fast UHS-II SD card. Need V90 UHS-II SD cards? Sony SF-G Tough Series UHS-II Memory Cards offer 300 MB/s read and 299 MB/s write speeds in 32GB, 64GB, and 128GB capacities. The V90 speed class guarantees minimum write rates of 90 MB/s. If you want the fastest write speed with a V90 rating and 250-300MB/s read rates, this is the card for you.
Best Value! The Lexar Professional 2000x UHS-II card delivers very fast read and write rates, and you can get a complimentary Lexar SD UHS-II Reader for high-speed file transfer from card to computer, speeding productivity. The V90 speed class guarantees minimum write rates of 90 MB/s. It’s ideal for UHS-II cameras that capture 4K or Full HD video at 8fps+. Faster buffer cleaning implies more shots.
Sony SF-G UHS-II Cards feature the same ultra-fast read and write speeds as SF-G Tough cards, but are U3 and V30 certified. Continuous filming and 4K video recording are supported. U3 speed class guarantees minimum write rates of 30 MB/s.
SanDisk Extreme PRO UHS-II SDXC Memory Cards can read 300 MB/s and write 260 MB/s. Amazingly quick! Perfect for continuous filming and 4K video. U3 speed class guarantees minimum write rates of 30 MB/s.
A+! Sony a9’s card slot 2 is compatible with UHS-I cards, and the quickest is SanDisk Extreme Pro 170 MB/s (with affordable price). SanDisk Extreme Pro 170MB/s UHS-I cards are perfect for full HD, 3D, and 4K video, raw, and burst photography. SanDisk Extreme Pro UHS-I cards have a V30 and U3 speed class rating, guaranteeing 30 MB/s write rates. 64GB, 128GB, 256GB, 512GB. The lifetime warranty cards are compatible with SDXC devices.
The SanDisk Extreme UHS-I SDXC Card (V30, U3) provides read rates of up to 150MB/s and write speeds of up to 70MB/s, making it perfect for fast-action or continuous burst mode photography, as well as full HD, 3D, and 4K video. A write-protect switch prevents unintentional data loss.