For the Canon EOS R3, consider these top memory cards:

1. CFexpress Type B: Delkin Devices BLACK, Sony TOUGH, and ProGrade Cobalt are excellent choices for high-speed shooting.
2. UHS-II SD: SanDisk Extreme Pro and Sony SF-G Tough are reliable options.

Choose based on your budget and needs.

So, when you're pushing the R3 to its limits, peak speeds matter way less than sustained performance and heat management. Tbh, the biggest risk with CFexpress is thermal throttling during long video takes or heavy 30fps bursts. I'd definitely recommend looking at the Angelbird AV PRO CFexpress Type B XT MK2. It’s VPG-400 certified, which basically guarantees that write speeds won't dip, ensuring your footage is safe and the camera doesn't hang. Another pro-level choice for reliability is the Wise Advanced CFexpress Type B PRO line; they’re known for super stable firmware that handles the R3’s data stream without hiccups even when the card gets hot. For the SD slot, the Lexar Professional 2000x SDHC/SDXC UHS-II is a solid, reliable backup. Just remember that the SD slot is gonna be your bottleneck for clearing the buffer, so I usually set my R3 to record the heavy lifting to the CFexpress and use the SD for JPEGs. Honestly, don't just chase the highest MB/s on the sticker—look for cards that prioritize sustained write speeds so you don't lose shots.

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Any CFexpress Type B cards are recommended.

Tbh there is already some solid advice here about heat and sustained speeds. It seems like the market is really shifting away from the old consumer brands and more towards companies that specialize strictly in pro video and cinema storage lately. From what I've seen in my own research, it usually comes down to two paths:
* The massive household names that have great global warranties
* The smaller, specialized boutique brands that focus on firmware stability for high-end rigs Honestly, if u want to be safe, just get any of the cards from Sony or ProGrade and call it a day. You can't really go wrong with those for this level of gear since they seem to have the most consistent reputation for being compatible with Canon’s newer bodies without any weird errors. Anyway, let us know what ur leaning towards or who u ended up going with!

Like someone mentioned earlier, those sustained speeds are what really keep the R3 happy during a long shoot. Ive been using mine for over a year now and one thing I definitely learned the hard way is to watch out for the dual-slot bottleneck. Basically, if you set the camera to record to both cards for backup, your lightning-fast CFexpress is basically gonna sit around waiting for the slower SD card to finish writing. This really kills your buffer recovery and makes that 30fps mode feel way more sluggish than it should. Also, big warning: be super careful about where you buy your cards. Fakes are everywhere these days on those huge auction and marketplace sites. Ngl, its tempting to grab a deal but if the price looks too good to be true, it probably is. Ive seen cards that look 100% legit but fail after a month or just dont hit the advertised speeds. Better to pay the premium at a real camera store than to deal with a corrupted shoot... just my two cents tho.