For the EOS R6 Mark III, I’d prioritize fast, reliable cards over max capacity. If you shoot 4K/6K, high-bitrate ALL‑I, or long bursts, go CFexpress Type B: ProGrade Cobalt, SanDisk Extreme Pro, Lexar Professional Diamond, or Delkin Black (choose 256GB–1TB based on your workflow). For stills and lighter video, a UHS‑II SD V90 is a solid second-slot option: Sony Tough V90, ProGrade V90, or Angelbird V90. Avoid bargain cards; they’re the #1 cause of buffer and corruption headaches.

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For the EOS R6 Mark III, you'll want to take advantage of its dual memory card slots. Slot 1 supports CFexpress Type B Memory Cards and Slot 2 supports SD/SDHC/SDXC UHS-I and UHS-II memory cards. For optimal performance, especially if shooting 40fps electronic shutter, and demanding 7K RAW video capabilities, go with a VPG 400 certified CFexpress Type B card for slot 1. For slot 2, a UHS-II V90 card works great for backup recording or less demanding tasks. V60 cards offer amazing value for lower-bitrate video recording and are totally fine for slower-paced shooters doing landscape, portrait, lifestyle, and street photography. Popular choices include Sony TOUGH series or Lexar Professional cards for reliability.

Great question! Since the R6 Mark III is a powerhouse for both high-speed bursts and 4K video, you definitely don't want to bottleneck it with slow cards.

I highly recommend investing in UHS-II V90 SD cards. While V60 cards are cheaper, V90s (like the ProGrade Digital Cobalt or Sony TOUGH G series) ensure the buffer clears instantly during continuous shooting and handle the highest bitrate video codecs without overheating or stopping.

If you are on a tighter budget, the SanDisk Extreme Pro (UHS-II) is a reliable middle ground, but for future-proofing this camera, stick to V90 speeds.

Happy shooting!

> "I'm looking for a couple of reliable cards, maybe one primary high-capacity one and a smaller backup." Tbh, focus on sustained write speeds rather than just peak burst - basically you want a card that won't thermal throttle during long 4K/60p or 8K takes. Community benchmarks have been pretty high on Nextorage B1 Pro for the CFexpress Type B slot lately. They use pSLC tech which is way more reliable for heavy workloads than the cheaper TLC stuff found in budget cards. For your SD backup, Exascend Catalyst UHS-II V90 is a solid choice - pretty much an industry standard for high-bitrate video reliability without the premium brand tax. Just check for the VPG-400 rating on the CFexpress side if you're doing heavy video; it's the only way to guarantee you won't get those annoying "recording stopped" errors mid-shoot.

Stumbled upon this today and man, the memory card struggle is real lol. Congrats on the R6 III! I've been using mine for a bit now and it's a total powerhouse, but it definitely makes you rethink your storage strategy. I'm not 100% sure about the technical limit on the buffer when you're mixing different card types. I think I heard someone mention that the camera might actually bottleneck to the SD card's write speed if you're doing simultaneous backup recording, but I haven't fully confirmed that myself yet. To give you better advice based on my experience so far, could you clarify a few things? * Are you planning to shoot RAW to one card and JPEG to the other, or are you looking for a full redundant backup on both slots? * For the video side, how much of that is going to be the highest bitrate 8K vs. standard 4K work? IIRC, the requirements for the high-bitrate video codecs are way more demanding on sustained speed than even the fast bursts, so knowing your priority there would help a lot. Tbh, it’s a bit of a learning curve with these newer bodies!

Lol I was literally about to post the same thing. Glad someone else brought it up.

Works great for me

Hey there! Oh man, congrats on the R6 Mark III – that's awesome! I totally get being overwhelmed with the memory card situation. It's like a whole different language with all those V numbers and CFexpress types, right?

Honestly, I was in the exact same boat a while back when I upgraded. I ended up going down the rabbit hole of testing different cards, and what I've found works best for me, especially with similar high-end Canon bodies that chew through data like yours will, is a combination of **ProGrade Digital CFexpress Type A cards** and some **SanDisk Extreme PRO UHS-II SD cards**.

For the CFexpress Type A, ProGrade has been a lifesaver. They're not the absolute cheapest, but the reliability is unreal. I've been using their 160GB and 320GB ones, and they handle the 8K video and insane burst rates without a single hiccup. I think I paid around $200 for the 160GB, which felt like a lot at the time, but when you consider not missing a shot or having corrupted footage, it's totally worth it for your primary card. The read speeds are also super fast, so offloading footage is a breeze.

For a backup or for less demanding stuff, I've always stuck with SanDisk Extreme PRO UHS-II SD cards. They're more budget-friendly, and for things like stills or 4K where you don't need the absolute bleeding edge, they're fantastic. I've got a couple of 128GB ones, and they've never let me down. You can usually find them for around $50-$70, which is a much gentler hit on the wallet.

So yeah, my main advice is to invest in at least one fast CFexpress Type A for your main shooting and use the UHS-II SDs for your backup. It’s a good balance of performance and cost-effectiveness. Let me know if you have any other questions, happy to chat more about it!

Hey there! Oh man, congrats on the R6 Mark III – that's awesome! I totally get being overwhelmed with the memory card situation. It's like a whole different language with all those specs! Since you're diving into serious action and 8K video, you're gonna want something that can really keep up. While V60 is the minimum for 4K, for the R6 Mark III's insane burst rates and higher-res video, I'd *seriously* consider **CFexpress Type A cards**. They're the premium option for a reason, offering way higher sustained write speeds than even the fastest SD cards.

Specifically, look for cards that hit at least 700 MB/s write speeds or higher. Brands like Sony (their TOUGH cards are fantastic!) and Delkin Devices are top-notch. For your primary high-capacity card, maybe a 160GB or 320GB CFexpress Type A would be perfect. For a backup, you *could* go with a high-end UHS-II SD card (like a SanDisk Extreme Pro V90 or Lexar Professional 2000x), but honestly, if the camera has two slots, maximizing performance with two CFexpress cards is the ultimate setup for that beast of a camera. Just be sure to check the specific card compatibility list on Canon's website for the R6 Mark III to be absolutely sure!

Hey there! Congrats on the R6 Mark III, that's a serious piece of kit! I totally get the memory card headache, honestly. It's a bit of a minefield out there, and unfortunately, I've had my share of issues with cards not performing as good as expected, especially when pushing them with high-speed bursts and 8K. It's really frustrating when you miss a shot or get dropped frames because of a card bottleneck. For something as demanding as the R6 Mark III, I'm all about reliability and safety first. While CFexpress Type A is technically the fastest, the SD UHS-II V90 cards have proven to be a fantastic sweet spot for me. They offer incredible speeds – often hitting close to theoretical limits in real-world tests – without the sometimes higher price tag or compatibility quirks of Type A for *every* slot. I've had great luck with SanDisk Extreme Pro V90 and Lexar Professional 2000x. For a primary card, I'd go with a 128GB or 256GB V90. For backup, a smaller, equally reliable V90 or even a very solid V60 if you're not consistently shooting the absolute highest bitrates for video. Definitely avoid anything that isn't at least V60, and for your use case, V90 is where you'll find the most peace of mind. Don't skimp here; a reliable card is cheaper than lost footage!

Hey there! Congrats again on the R6 Mark III – seriously exciting stuff! So, I've been wrestling with memory cards for years, and honestly, for the R6 Mark III, it's all about finding that sweet spot between performance and your wallet. I've noticed a lot of people jump straight to the absolute top-tier, which, yeah, is amazing, but can seriously drain your budget.

What I've found works brilliantly for me, especially with my R5 (which shares a lot of the R6 Mark III's demands), is not always going for the *most* expensive V90 card. Look for reputable brands like SanDisk, Lexar, or ProGrade Digital, and focus on cards that are at least V60 rated and UHS-II. Honestly, for most of my 4K work and even burst shooting, a good V60 has been totally sufficient and saved me a good chunk of cash compared to V90. I'd grab one or two solid V60 cards for your primary use, and maybe a smaller, cheaper one for backups or less demanding stuff. Always check reviews for specific card models, as not all V60s perform identically! It's about value, not just the highest number, you know?

Hey there! Congrats on the R6 Mark III, that's seriously exciting! I've definitely been down the memory card rabbit hole myself, especially with these newer, speed-hungry cameras. You're right, they can really push cards to their limits with all that high-speed burst shooting and 8K goodness.

So, instead of just saying 'get XYZ brand,' I've actually found it's super interesting to look at the brand landscape for these demanding cards. For CFexpress Type A, it's pretty much Sony and ProGrade Digital dominating the market right now, and honestly, for the R6 III, you're gonna want to stick with those. Sony's own cards are, unsurprisingly, super reliable and designed to work seamlessly. I've used their 160GB Type A card extensively for video and it's just flawless. No dropped frames, ever.

ProGrade Digital is a really strong contender too. They often offer a bit more capacity for the price, and their Cobalt series (the V90 ones) are absolute beasts. I've had zero issues with them, and some people even find their read speeds slightly faster on their card readers, which is a bonus if you're offloading huge files.

For SD cards, if you're going the UHS-II route for a backup or secondary slot, Lexar and SanDisk are still top dogs. Make sure it's a V90 rated card. I've had mixed experiences with some lesser-known brands claiming high speeds, and honestly, it's not worth the risk of missing a shot. Lexar's Professional 2000x series has been rock solid for me. They offer a good balance of speed and price.

So, my market research perspective leans heavily towards Sony and ProGrade Digital for your primary CFexpress Type A, and then a reliable V90 UHS-II from Lexar or SanDisk for your backup. It might feel like a bit of an investment, but trust me, the peace of mind and consistent performance are absolutely worth it for what you're shooting! Happy shooting!