I've been geeking out over the bus speeds on my a7CII lately and honestly, most users overbuy. I did a DIY stress test using a card reader and some benchmarking software to see where the real-world bottlenecks are. I found that ProGrade Digital SDXC UHS-II V60 Gold 128GB cards are the actual sweet spot for this body. The math is pretty simple: the a7CII tops out at 200Mbps for most 4K modes, which is only 25MB/s. Even a V30 card could technically do it, but you want the V60 for that buffer clearing speed during burst shots. I've been running the Wise Advanced SDXC UHS-II V60 256GB lately too. It handles heat dissipation much better than the thinner plastic cards when shooting long video clips in the sun. You really dont need to drop V90 money unless you are doing heavy All-Intra work. Just keep an eye on the sustained write specs, not just the peak burst numbers advertised on the front. It is kinda wild how much you can save when you stop chasing the V90 label for no reason.

Honestly, i've been shooting with Sony for over ten years and the memory card situation still drives me crazy. Just last week, i had a high-end card basically brick during a session on my a7CII and it is just... exhausting. You spend all this money on a compact body and the picky card slots make it a nightmare. I have had issues with almost every mainstream brand mentioned so far, its so disappointing. After losing footage twice, these are the only ones i have found that actually hold up without throwing errors:

• Nextorage B1 Pro V90 UHS-II 128GB
• Exascend Catalyst V90 UHS-II 128GB Its just frustrating that we still have to play this guessing game. Spent way too much on expensive cards that ended up being paperweights... dont make the same mistakes i did.

The a7CII supports both UHS-I and UHS-II SD cards, but UHS-II cards are recommended for their superior speed.

Best UHS-II Cards

1. Sony SF-G Tough

   • Approx. In-Camera Write Speed: 247 MB/s
   • Video Rating: V90
   • Ideal for high-speed continuous shooting and 4K video recording.

2. Kingston Canvas React Plus

   • Approx. In-Camera Write Speed: 246 MB/s
   • Video Rating: V90
   • Great for both photography and videography.

3. SanDisk Extreme Pro UHS-II

   • Approx. In-Camera Write Speed: 244 MB/s
   • Video Rating: V90
   • Excellent choice for high-bitrate video and fast burst shooting.

4. Lexar Professional 2000X

   • Approx. In-Camera Write Speed: 243 MB/s
   • Video Rating: V90
   • Reliable performance for both stills and video.

5. Delkin Devices POWER

   • Approx. In-Camera Write Speed: 243 MB/s
   • Video Rating: V90
   • Good for high-resolution video and fast image capture.

SanDisk Extreme Pro UHS-II V90 is recommended.

Good to know!

Honestly, people always jump straight to recommending the most expensive V90 cards, but if you actually sit down and look at the technical specs of the a7CII, you can save a ton of money. Unless you are planning to shoot heavily in XAVC S-I 4K (All-Intra) which can hit higher bitrates, you are gonna be totally fine with V60 cards for almost every other mode. I did the math and most 4K settings on this body only pull about 200Mbps, which is just 25MB/s. Buying a V90 for that is kinda overkill.

• ProGrade Digital SDXC UHS-II V60 Gold is probably the smartest buy right now. It has really consistent sustained write speeds that wont dip during long video takes.
• Sabrent Rocket V60 SD Card is another great budget-friendly option. It uses high-quality flash and honestly performs just as well as cards twice the price in my experience.
• Sony SF-E Series UHS-II V60 is the way to go if you want the Sony brand name but dont want to pay the premium for the SF-G series. Tbh, doing a bit of self-service research on your specific bitrates is the best way to save. A V60 card gives you 60MB/s guaranteed, which is more than double what most of the a7CII video modes actually require. It is a much better way to spend your gear budget instead of just buying the most expensive thing on the shelf!

Like someone mentioned, it really comes down to that V60 vs V90 debate and whether you actually need the speed for All-I video. Most of the guys here are right that V60 is plenty for most things, but the reliability issues some of you are having sounds like a total nightmare! I honestly love how tiny the a7C II is for travel though! I took mine on a trip to the Smokies recently and it was fantastic not having a massive rig hitting my hip. But I bought this ultra-slim strap that I thought was gonna be so sleek, and it ended up being so thin it felt like a cheese wire cutting into my neck after two miles. I spent half the hike trying to wrap my hoodie around it just to stop the chafing. Then I saw a bear near the trail and was so distracted by my neck hurting that I almost forgot to take the lens cap off! Such a rookie move for someone whos been shooting this long. Anyway lol, sorry kinda went off topic there. TL;DR: Thread is basically split between saving money with V60 or paying for V90 peace of mind, just watch out for compatibility bugs!

I'd recommend the Angelbird AV PRO SD MK2 V90 cards. They're built like tanks, have consistent performance, and come with data recovery software. Been using them for 8 months with my a7CII for commercial work without a single issue.

Man, i feel you on this. I have been having the exact same struggle with my a7C II lately and it is driving me insane. I spend hours looking at buffer clearing benchmarks and I still dont feel confident in any of these options. I am honestly terrified of a card failure mid-shoot like you mentioned. A few things I am worried about based on what I have read:

• I think I heard that some newer controllers have sync issues with the Sony firmware, causing random lag.
• Not sure but someone told me that certain v60 cards might still trigger that card speed warning in high-temp scenarios even if they are rated for it.
• IIRC there was a thread about how certain brands overstate their sustained write speeds compared to burst. Make sure to be careful with whatever you land on. I am still sitting here with an empty slot because the technical data just doesnt seem to match real-world reliability yet. It is a nightmare when you just want the performance you paid for.