Best Memory Cards Nikon Z6 III – Real Benchmarks

The Nikon Z6 III is the ultimate hybrid tool, bridging the gap between a standard mirrorless like the Nikon Z6 II, and the high-speed Nikon Z8. Because of its new “Partial-Stacked” sensor, the Z6 III can push massive amounts of data—specifically in 6K N-RAW and high-speed 120fps bursts.

Choosing the right media is no longer just about storage capacity; it’s about sustained write speed. In this guide, I break down the best CFexpress Type B and SD UHS-II cards based on real-world benchmarks I’ve performed in the Z6 III body.

The Dual-Slot Strategy: CFexpress vs. SD

The Z6 III features one CFexpress Type B slot and one SD UHS-II slot. How you use them depends on your “Hybrid” needs:

The Video Path (H.265): If you only shoot H.265 video, you can often get away with high-quality SD cards, but CFexpress is still recommended for heat management during long takes.

The Professional Path (N-RAW/Burst): Use a high-sustained-speed CFexpress Type B in Slot 1 for your primary footage and high-speed bursts.

The Redundancy Path (Weddings/Events): If you are writing to both slots for backup (Overflow/Backup), the camera will bottleneck to the speed of the SD card. In this case, you must use a V90 SD card in Slot 2 to keep the camera responsive.

Best CFExpress Type B Memory Cards – Nikon Z6 III

For the Z6 III, the most important metric is Sustained Write Speed. For example, to shoot 6K N-RAW, you need a card that can maintain at least 400 MB/s indefinitely.

The Future-Proof Pick: While the Z6 III is a CFexpress 2.0 camera, CFexpress 4.0 cards (like the ProGrade Iridium) are backward compatible. They won’t make the camera faster, but they will cut your file transfer times in half when offloading to your computer.

Top Recommendation: Lexar Gold Series. It offers incredible value and has proven itself in my Z8 and Z6 III tests, handling the highest bitrates Nikon offers.

The Reliability Pick: Delkin Black. These cards are designed for thermal efficiency, which is vital for a camera like the Z6 III that can run hot during 6K recording.

See all the CFexpress Type-B benchmarks to compare other cards.

Choosing the Right SD Card for Slot 2

Don’t overlook the SD slot. If you set your camera to “Backup” mode, a slow SD card will make your expensive CFexpress card feel like a $20 budget card.

For Hybrid Shooters: Use a Sony G Tough V90 or SanDisk Extreme Pro V90. These are the only SD cards that can keep up with the Z6 III’s burst rate for more than a few seconds.

For Casual Shooters: A V60 card like the Lexar 1800x is perfect if you are just shooting JPEGs or standard H.265 video. It runs cooler and costs significantly less.

If, for some reason, an SD card is not running properly in the Nikon Z6 III, try removing the battery and card, then inserting the card and the battery to see if the camera correctly identifies the card. Sometimes, that can help if the camera redirects the card as UHS-II.

Also, as a reminder, keep your UHS-II card pins clean. Having dirt or lint can affect their performance, causing them to run only at UHS-I speeds. This happens occasionally when I test these cards.

Best Memory Card For Video With Nikon Z6 III

The Nikon Z6 III can shoot 6K RAW and ProRes RAW, requiring CFexpress Cards. However, if you’re shooting H.265, you can use SD memory cards or mid to low-range CFexpress Cards.

6k60p N-RAW 12-bit runs at 3730 Mbps. This is 466.25MB/s. So you’ll need to get a good CFexpress Card to sustain that. Not many of the cheaper cards can, which is why I recommend only the top brands or the higher-end cards from budget brands.

5.3k 60p H.265 runs at 400Mbps which is 50MB/s. This means you could shoot H.265 at the max bitrate with only a v60 UHS-II SD memory card.

Also, if you’re only going to use H.265, you can save a lot of money with V60 cards; they run much cooler than CFexpress Cards. So I recommend them if you’re not a serious videographer or if you’re doing very long takes, where the heat buildup from CFexpress Type-B cards could cause problems.

Should you shoot ProRes 422 HQ or H.265?

When the Nikon Z6III was first announced, I saw a lot of people saying it does 4:2:2 10-bit H.265. But now I’m reading the reference manual, which says that H.265 or H.264 is 4:2:0 only, so it’s the same as the Nikon Z8.

So, if you’re doing a lot of color grading, you might want to shoot ProRes for the 4:2:2 subsampling.

The Bitrate of Apple ProRes 422 HQ at 6k60p is 1909 Mbps, which is 238.62 MB/s. According to Apple’s ProRes White Paper. You need a decent CFexpress Type-B memory card to run 6k60p ProRes HQ with the Nikon Z6III.

Nikon Z6 III SD Memory Card Benchmarks

As mentioned, the Z6 III has a bottomless buffer with CFexpress Type-B cards. Still, I got proper benchmarks for SD Memory Cards by filling the buffer with a continuous burst of RAW shooting and then calculating the time it took to clear the buffer relative to the total data written.