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Sony FX3 Memory Cards: When V30 SD Works and When You Need CFexpress Type A

Sony FX3 cinema camera

Photo: Henry Söderlund, Wikimedia Commons, CC BY 2.0.

Choosing a memory card for the Sony FX3 is more complicated than buying the fastest card you can find. The camera accepts both SD cards and CFexpress Type A cards in either slot, but the card required changes with the recording format, bitrate, frame rate, and whether proxy recording is enabled.

My current kit includes an Angelbird AV PRO CFexpress Type A 1TB card, SanDisk Extreme 512GB V30 cards, and SanDisk Extreme PRO V30 cards in 256GB and 64GB capacities. They do not all serve the same purpose. Here is the simple way I separate their roles.

The Short Answer

  • V30 SD cards: useful for supported lower-bitrate recording, including certain modes at 200 Mbps or below.
  • V60 SD cards: the practical minimum for many XAVC HS 4K and XAVC S 4K settings above that range, up to 280 Mbps according to Sony's compatibility table.
  • V90 SD cards: required for XAVC S-I 4K and XAVC S-I HD recording when using SD media, as well as some high-frame-rate S&Q settings.
  • CFexpress Type A with VPG200 or higher: the most flexible option and required for the FX3's highest-data-rate 4K slow-motion setting.

The label on the card matters. Capacity such as 256GB or 1TB tells you how much it stores; V30, V60, V90, or VPG200 tells you more about whether it can sustain the required recording speed.

When a V30 SD Card Is Enough

Sony states that an SDXC card rated U3/V30 can be used when the recording bitrate is 200 Mbps. This makes V30 cards useful for a number of everyday recording settings, depending on the exact format selected in the camera.

That does not mean every SanDisk V30 card is suitable for every FX3 mode. Before a shoot, I match the camera's selected file format, record setting, and frame rate against Sony's media table. If the planned mode calls for V60, V90, or CFexpress Type A, I do not rely on V30 media simply because it worked in a lower-bitrate setting.

My SanDisk V30 cards are therefore best treated as mode-specific media, overflow cards, or cards for compatible lower-bitrate jobs—not as universal FX3 cards.

When V60 or V90 Makes Sense

For XAVC HS 4K and XAVC S 4K at bitrates up to 280 Mbps, Sony lists SDXC V60 or faster media. Some 120p/100p S&Q combinations require V90 even when other settings in the same format work with V60.

When recording XAVC S-I 4K at up to 600 Mbps or XAVC S-I HD at up to 222 Mbps, Sony specifies SDXC V90 or faster if an SD card is used. V90 is therefore the safer SD-card category for creators who regularly move among All-Intra and high-frame-rate settings and want fewer card changes.

Even then, the exact mode should be checked. A speed class is a minimum performance category, not a guarantee that every card will support every camera function.

When CFexpress Type A Is Necessary

CFexpress Type A becomes essential for the most demanding FX3 setting in Sony's table: XAVC S-I 4K slow-motion recording at 1200 Mbps. Sony specifies a CFexpress Type A card rated VPG200 or higher for that mode.

It can also be used across many less demanding modes, which is why my Angelbird AV PRO CFexpress Type A 1TB card is the most flexible card in the kit. The tradeoffs are cost and the need for a compatible reader. Also note that the FX3 uses CFexpress Type A, not the physically larger Type B format.

Do Not Forget Proxy Recording and Dual Slots

Proxy recording can raise the media requirement, so a card that supports the main recording setting alone may not be enough once proxies are enabled. Check the camera's warning messages and Sony's current help guide whenever the setup changes.

Both FX3 slots accept supported SD or CFexpress Type A media. Dual-slot recording can provide redundancy in compatible modes, but the cards still need to meet the recording requirement. Two slow cards do not become one fast card.

My Practical Card Plan

For a predictable shoot, I would organize this kit as follows:

  1. Use the Angelbird CFexpress Type A card for the highest-data-rate modes and shoots where maximum format flexibility matters.
  2. Use the SanDisk V30 cards only after confirming the exact chosen setting is supported.
  3. Label and format cards in the FX3 before the job, after verified backups exist.
  4. Avoid changing recording formats mid-shoot without rechecking the card requirement.
  5. Copy the complete card structure to two verified destinations before erasing the original.

Final Take

The best FX3 card is determined by the recording mode, not by brand or capacity alone. V30 can be perfectly appropriate in a supported lower-bitrate setting, V60 covers many common 4K modes, V90 is needed for several All-Intra and high-frame-rate options, and CFexpress Type A VPG200 is required when the camera is pushed to its most demanding slow-motion setting.

Before buying or recording, compare your exact settings with Sony's current FX3 memory-card compatibility guide.

Affiliate disclosure: This article contains Amazon affiliate links. If you make a qualifying purchase, I may earn a commission at no additional cost to you. As an Amazon Associate I earn from qualifying purchases.

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