Nikon Z8 Memory Card Guide: 8K RAW & Dual-Slot Specs

The Nikon Z8 is a professional hybrid workhorse. Whether you are shooting 8K/60p N-RAW video or blasting 20 frames-per-second RAW photo bursts, the camera generates a massive amount of data in a very short amount of time.

To manage all that data, the Z8 uses a mismatched dual-slot system: Slot 1 takes high-speed CFexpress Type B cards (or older XQD media), and Slot 2 takes standard UHS-II SDXC cards.

If you put slow, outdated memory cards into this camera, you will immediately lock yourself out of its best features. The internal buffer will choke, video recordings will abruptly stop, and you will miss shots. This guide outlines exactly which memory cards the Z8 requires to run at full capacity, and how to configure the menus to avoid the dual-slot bottleneck.

Quick recommendations: The best memory cards for the Z8

If you want to skip the technical deep dive and just get reliable media, these are the formats I recommend. Based on Nikon’s official testing and my own independent memory card speed tests, these provide the sustained write speeds necessary to keep up with the Z8’s highest bitrates.

• Slot 1: CFexpress Type B
• Slot 2: SDXC V90 UHS-II
• Dual CFexpress B / SDXC UHS-II Memory Card Reader

What is in my Z8 right now? In the field, I run a 1TB Lexar Professional GOLD CFexpress Type B card in Slot 1, and a 256GB ProGrade Digital V90 SDXC card in Slot 2. I also heavily rely on the ProGrade Cobalt line (the CFexpress 2.0 Type B Cobalt cards have been discontinued, but Cobalt lives on as ProGrade’s flagship CFexpress 4.0 card, sitting above the Iridium series).

Nikon Z8 memory card compatibility & requirements

Because the Z8 offers such a wide array of high-resolution video and photo burst modes, the specific memory card requirements change depending on exactly how you intend to use the camera.

Nikon’s official approved list

Nikon regularly tests and updates an official list of approved memory cards for the Z8. According to their technical guidance, the camera requires premium media for its flagship features:

• For N-RAW (12-bit) and ProRes RAW HQ: Nikon recommends specific high-end CFexpress Type B cards, singling out its own 660GB MC-CF660G and the Nextorage NX-B1PRO series, along with the ProGrade Digital Cobalt/Iridium series.
• For general video recording and playback: They recommend CFexpress or XQD cards with a maximum data transfer rate of at least 45 MB/s, or SD cards rated UHS Speed Class 3 (U3) or better.
• For recording and playback of video at high frame sizes or frame rates: They recommend CFexpress or XQD cards with a maximum data transfer rate of at least 250 MB/s, or SD cards rated UHS Speed Class 3 or better that also hit 250 MB/s.

While the Z8 is technically compatible with older XQD cards and slower UHS-I SD cards, using them for anything beyond basic photography isn’t practical. If you try to push the camera using legacy cards, the internal buffer will stall out almost immediately.

Slot 1: Should you buy a CFexpress 4.0 card?

The CFexpress market is currently transitioning from the older 2.0 spec to the newer, twice-as-fast 4.0 spec. Because the cards look identical, navigating this shift is a great opportunity to save money if you know what to look for.

The Nikon Z8 is a CFexpress 2.0 camera. It physically lacks the PCIe Gen 4 hardware required to hit the newer 4.0 speeds. This is a hardware limitation that cannot be changed with a firmware update.

Because the CFexpress standard is backward compatible, you can put a bleeding-edge 4.0 card into the Z8 and it will work flawlessly. The camera simply throttles that card down to 2.0 speeds. While you won’t see an in-camera performance bump from a 4.0 card, this backward compatibility opens up some excellent opportunities for smart buying.

In a perfectly logical market, you’d just buy the cheapest 2.0 card you could find. But the market is currently shifting. Because manufacturers are aggressively changing their production lines to the new standard, newer 4.0 cards are sometimes actually cheaper and more readily available than the legacy 2.0 cards they replaced. In a market distortion due to algorithmic pricing based on the limited availability of legacy stock, older 2.0 cards frequently show up at massively inflated prices.

The rule of thumb is to look at the sustained write speeds and go with whatever is cheaper, regardless of whether the label says 2.0 or 4.0. If you spot a 4.0 card for the same price or cheaper than its 2.0 equivalent, grabbing the newer version is a fantastic win. You keep extra money in your pocket today, and you unlock drastically faster desktop offload speeds when you get back to your desk (provided you pair it with a USB 4.0 memory card reader).

The high-performance cards listed below are essentially the modern, over-provisioned replacements for the legacy 2.0 cards Nikon originally tested. Look for cards with a VPG400 logo — this guarantees a minimum sustained write speed of 400 MB/s, but the premium cards recommended here sustain 800 MB/s or higher to comfortably clear the Z8’s 8K N-RAW bottleneck:

Firmware Note:

While the Nikon Z8 natively supported CFexpress Type B cards from day one, Nikon has continually expanded the camera’s compatibility list and memory card performance through post-release updates.
Major patches, such as Firmware Version 2.10, specifically addressed buffer capacity drops and improved write reliability across a wider range of third-party CFexpress manufacturers. To ensure your camera achieves maximum buffer clearing speeds with newer cards, always verify you are running the latest firmware from Nikon’s Download Center.

The dual-slot bottleneck trap

While you do not have to fill both slots, utilizing dual cards gives you excellent data management flexibility in the field. However, you must be careful about how you configure them in the menu, or you will accidentally cripple the speed of your CFexpress card.

CFexpress Type B cards are blisteringly fast, routinely sustaining write speeds over 1400 MB/s. By comparison, even the fastest SD cards are slow; the absolute fastest UHS-II SD cards on the market max out at around 300 MB/s. This creates a massive speed disparity between Slot 1 and Slot 2.

If you configure the Z8 to shoot in Backup Mode (writing duplicate RAW files to both cards simultaneously as a fail-safe), the camera’s processor cannot clear its internal buffer until the file is written to both locations. Because the SD card is physically much slower than the CFexpress card, the entire camera will instantly bottleneck to the speed of the SD card.

In the field, it is generally best to avoid Backup Mode on the Z8 for this exact reason, especially when shooting fast-paced sports or wildlife. Instead, configure the slots to RAW / JPEG. This routes the massive RAW files to the lightning-fast CFexpress card in Slot 1, while sending a smaller, lightweight JPEG to the SD card in Slot 2. The JPEG writes fast enough that it does not drag down the burst rate of the primary card. Alternatively, skip the JPEG backup entirely and just use the standard Overflow mode.

Heads up! Don’t buy an SD Express card. The Z8 lacks the internal hardware to utilize the emerging SD Express standard. While they will physically fit, they will default to sluggish UHS-I speeds, wasting your money. Stick to standard UHS-II SDXC cards.

Slot 2 itself is not fussy about the card type. It takes SD, SDHC, and SDXC cards, and a UHS-I card will work fine for casual shooting. The limit is the bus: UHS-I tops out at about 104 MB/s, so a UHS-I card in Slot 2 will slow buffer clearing and cap what you can safely record to that slot. UHS-II cards use a second row of contacts to get past that, and they stay backward compatible — a UHS-II card still works in a UHS-I reader, just at UHS-I speeds.

Formatting & card prep

It’s best practice to always format your memory cards inside the Z8 before a shoot to ensure the file tables match the camera’s exact folder hierarchy.

You can format either slot by navigating to the yellow Setup Menu (Wrench Icon) > Format memory card. Be sure to select the correct slot before confirming.

If you accidentally format the wrong card, stop shooting immediately and pull the card from the camera. As long as you have not overwritten the memory sectors with new data, you can usually recover your deleted photos using a desktop recovery tool.

If your SD or CFexpress card begins to act sluggishly or throw read errors over time, you will need to connect the card to your computer and execute a full format instead of a quick format using a dedicated utility tool to properly wipe and restore the drive.

The cable bottleneck

The file sizes generated by the Z8 are massive — a single minute of 8K/60p N-RAW takes up roughly 40GB of space. You will want a dedicated CFexpress Type B reader. However, be incredibly careful with how you connect it to your computer.

If you use a standard USB-C charging cable (like the one that came with your phone or laptop charger), your transfer speed will immediately bottleneck to 480 Mbps (roughly 60 MB/s) because charging cables lack the internal shielded data wires. Always use the short, stiff, high-speed data cable that ships in the box with a quality reader.