yo, congrats on the R6 Mark II! Honestly, it’s such a beast. I’ve been shooting Canon for over ten years now and moving to mirrorless was a total game changer, but yeah, those old UHS-I cards literally cant keep up with the R6II's speed. Basically, your camera is trying to dump a massive amount of data into a tiny straw, which is why you're getting that 'Busy' lag. For your situation, I think V60 is actually the sweet spot. Ngl, unless you’re shooting 4K/120p or doing massive 40fps RAW bursts until the card is full, V90 is highkey overkill. I’ve been super happy with the Kingston Canvas React Plus 128GB UHS-II V90 SDXC. The cool thing is it’s actually a V90 card but usually costs around $65, which is basically V60 pricing! I've had zero 'Card Error' issues or overheating with it. Another solid budget pick is the ProGrade Digital SDXC UHS-II V60 Gold 128GB which runs about $50. TL;DR: Grab V60 cards (or the value Kingston V90) to save money. You wont notice a big buffer diff for most sports. gl!

Sooo i actually just went through this exact headache with my R6 setup. Honestly, for high-speed RAW bursts, the V60 vs V90 thing is basically down to how long your bursts are. I found that unless youre holding the shutter for like 10 seconds straight, V60 cards are usually totally fine. I've been using the Lexar Professional 1800x SDXC UHS-II Card 128GB GOLD Series and it's been a lifesaver... way faster than my old DSLR cards. About the heat stuff - yeah, be careful with the really cheap brands. I've heard some things about cards getting toasty, but my ProGrade Digital SDXC UHS-II V60 Gold 128GB cards stay pretty cool even during long sessions. Tbh, V90 cards are cool but they're so pricey i think V60 is the sweet spot for most of us. Plus, save that extra cash for lenses! gl with the new camera

Honestly, if youre looking at the market right now, the Sony Tough cards are a bit of a polarizing choice but worth the deep dive. I've used the Sony SF-M Series Tough UHS-II V60 cards for a while now, and while they are basically bulletproof because they dont have those flimsy plastic ribs or the write-protect switch that always breaks, they do run a bit more expensive. But yeah, if you're worried about 'Card Errors' or physical damage during travel, that ribless design is a huge plus for reliability. Another brand that gets overlooked in the consumer space but is massive in the pro video world is Angelbird. Their Angelbird AV PRO SD MK2 V60 cards are incredibly solid and often have better sustained write speeds than the big names like SanDisk. People usually sleep on them because they arent in every big-box store, but the stability is top-tier. One thing to keep in mind with the R6 Mark II is that since it has dual UHS-II slots, you should really try to run a matched pair. If you shoot to both cards simultaneously for backup, your performance is limited by the slowest card. Anyway, just stick to a matched pair of high-quality V60s and you'll be pretty much set for anything short of heavy video work!!!

I have been super happy with the Delkin stuff lately. If you want reliability without the Sony Tough price tag, the Delkin Devices 128GB POWER SDXC UHS-II V60 is a total win. These have been flawless in my R6 II since I made the switch. The buffer clears fast enough that I rarely hit a wall even during long sequences of birds in flight. Quick tip tho... if you are worried about card errors, just make sure you are doing a low-level format in the camera menu rather than just deleting files on your PC. It keeps the card healthy and avoids fragmentation issues. Another one to look at is the Sabrent 128GB Rocket V60 SDXC UHS-II which I keep as a backup. It works well and stays cool during long shoots. Both brands seem to handle the heat way better than the older cards I used to run. Tbh I am very satisfied with the V60 performance for sports, V90 feels like overkill unless you are doing heavy 4K120 video.

Been geeking out on sustained write speeds lately and honestly, the big name brands are sometimes a bit overpriced for what they actually deliver. Ive been really happy with some of the more storage-focused brands that build their own controllers. Here is what has been working well for my setup:

• Sabrent Rocket V60 SDXC UHS-II Memory Card 128GB
• OWC Atlas Pro SDXC UHS-II V60 128GB
• Wise Advanced SDXC UHS-II V60 128GB Tbh, V60 is plenty for the R6 Mark II buffer. I ran some DIY tests and the camera hits a physical limit before the card usually does on V90s anyway. Save the cash for a better lens or extra batteries... you wont miss the extra speed during bursts. Quick tips:
• Always use a high-quality UHS-II reader to offload. Cheap ones can actually corrupt the card headers.
• Format in-camera every single time you clear your footage. Keeps things snappy.

Just saw this thread and felt like I had to chime in because I've had a pretty rough time with cards lately. Before I get into the technical side tho, are you planning on shooting with both slots for overflow or are you doing the redundant backup thing? It changes how the camera handles the data stream quite a bit. Honestly, it has been a bit of a letdown. I picked up some high-end cards thinking they would be the ultimate solution for my R6 II, but the long-term reliability just wasnt there. After about 10,000 frames, my setup started lagging way more than it did on day one. It is super annoying when the buffer says it is clear but the camera still feels sluggish.

• one card actually started peeling at the seams
• random write errors during cold weather
• speed drops once the storage hits 50 percent capacity I have spent way too much time testing different options just to find something that doesnt overheat after twenty minutes of shooting... its a total headache.

Seconding the recommendation above! V60 is definitely the sweet spot for the R6II buffer clearing. I’ve had zero issues with these: • ProGrade Digital 128GB SDXC UHS-II V60 Gold Card - Killer value and super reliable for bursts.
• SanDisk 128GB Extreme PRO SDXC UHS-II V60 Card - Bit of a price premium but basically indestructible. Honestly, unless you're shooting 4K/120 all day, you wont even notice a speed difference with V90s. Save that money! 👍