Speed ratings matter cuz high bitrates can crash. I had V60s fail during sports, so i strictly use Sony TOUGH-G series SDXC UHS-II V90 128GB now for safety. honestly dont risk it!

Quick question - are u planning on shooting in the XAVC S-I format or just standard 4K? basically, i've used V60s for years and i'm super satisfied with how they work for the price. * Grab the Lexar Professional 1667x 128GB SDXC UHS-II V60 to save a ton of money.
* V90 is honestly overkill unless ur hitting those max 600Mbps bitrates. Let me know ur settings!

tbh I totally agree that those V90 prices are kinda scary - like, do we really need to spend that much? I've been doing some digging into the market lately since I'm also on a budget, and it seems like some brands offer way better value than the "big" ones everyone always talks about. If you're worried about V60 being too slow but don't wanna go broke, you should check out the Kingston Canvas React Plus SDXC UHS-II. It's basically one of the cheapest V90 cards I’ve found while researching, and people seem to love it for the price-to-performance ratio. Another solid middle ground could be the ProGrade Digital SDXC UHS-II V60 Gold - it feels like a step up in build quality without the Sony price tag, you know? Anyway, I'm still learning all this too - but do you actually need the V90 to even enable 4K 60p on the a7 IV, or is it just for the super high quality "All-I" settings? That's the part that always confuses me lol.

Honestly, if you are planning on pushing the a7 IV to its limits with 10-bit 4:2:2 at 60p, the bitrate overhead is the real killer. You really want to look at the sustained write speeds rather than just the peak bursts. In my technical opinion, you should just go with ProGrade Digital. They are basically the industry standard for high-end mirrorless setups right now and their quality control is top-notch. If you want something more widely available, you honestly cant go wrong with the top-tier cards from SanDisk. They have been super consistent for years and their error handling is usually better than most of the budget brands. Just make sure you are getting their fastest V90 rated stuff so you dont bottle-neck the camera during those long sports sequences. I always tell people that the extra peace of mind is worth the price jump, especially for paid work tho.

oh man congrats on the a7 IV!! it is literally such an amazing camera, youre gonna love it! i've been using mine for a few months and tbh the card situation is kinda confusing. i'm super cautious about losing data so i usually over-spec just to be safe. here is what i think: • V60 cards: i think these are okay for basic stuff, but iirc they might struggle with high-bitrate 4k 60p or really long bursts. i'd be worried about losing a shot!
• V90 cards: honestly this is the sweet spot for reliability. i use sandisk or sony and they've been fantastic. basically no buffer issues during sports!
• CFexpress Type A: the absolute SAFEST option but sooo expensive. idk but i'd say go v90 for total peace of mind... better safe than sorry right? anyway good luck with the new rig!! 👍

Building on the earlier suggestion about the technical side of bitrates, i'm totally on board with the V90 crowd if you're hitting that XAVC S-I 4K 60p. Like, we're talking a 600Mbps stream which translates to 75MB/s. Since V60 only promises a minimum sustained 60MB/s, you'll literally get a Card Speed Too Slow error right when things get good. It's so frustrating!! If you want something reliable that wont break the bank as much as the Sony Tough cards, you should look at the Sabrent Rocket V90 SDXC UHS-II. I've been doing some deep dives into their controller specs and they are fantastic for sustained writes. Another amazing pick is the SanDisk Extreme PRO SDXC UHS-II V90 which is just a classic workhorse for those high-speed sports bursts. Seriously tho, do yourself a favor and run a benchmark test when they arrive. I always use a tool like H2testw to make sure the capacity and speeds are legit before I trust my shots to a new card. I love testing this stuff myself because you'd be surprised how much variance there is between batches. Better safe than sorry when you're shooting 10-bit color!!