Are you writing to both slots for redundancy? In my experience that matters most for weddings.

• Sony SF-M Tough Series V60 is very reliable
• ProGrade Digital SDXC UHS-II V90 clears the buffer faster

> i have about 200 bucks to spend on new storage before the weekend @Reply #2 - good point! Writing to both slots for backup is non-negotiable for weddings but man, it kills your buffer if the cards are slow tho. Honestly I used to spend a fortune on big name brands until I realized you're basically paying for the logo half the time. For your $200 budget you can actually get two Kingston Canvas React Plus 128GB UHS-II V90 cards. I’ve been using them in my R6 and they clear the buffer way faster than my old cards ever did. Plus they usually come with a reader in the box. If you want to save even more, the Sabrent Rocket V60 SDXC UHS-II is a sleeper pick. I keep a few as backups and they've never let me down. Just dont forget to format them in-camera right before you start shooting... seen way too many people skip that step and regret it later.

tl;dr: You're hitting a massive write speed bottleneck, but before spending that 200 bucks, are you shooting in full uncompressed RAW or C-RAW? Also, do you actually need V90 for video, or is this strictly to fix the photo buffer? Man, I totally feel that pain. Nothing makes you look more like a deer in headlights than that blinking red light while a couple is doing something cute. Been there. The R6 pushes a ton of data, especially since the mechanical shutter hits 12fps. Those gold cards you've got are probably UHS-I, which basically caps out at like 90MB/s write speed if you're lucky. You're trying to shove a fire hose through a straw. I'd be careful about just blindly grabbing the fastest thing on the shelf. V90 cards are amazing for clearing the buffer in seconds, but they're gonna eat your budget for very little storage. I'm curious tho, are you shooting to both slots at the same time for backup? Because if you have one fast card and one slow card, the camera throttles everything to the slowest one. It's a total buzzkill. Also, how many frames are you usually firing off in a single burst? If we're talking 30+ frames of uncompressed data, even a decent card might sweat a bit. Just trying to figure out if you need raw speed or just better sustained write performance for the Chicago gig.

Can vouch for this

Just saw this thread and ngl that red light blinking is pure stress. I went through the same thing when I first got my R6 for wedding work. I ended up doing a deep dive on sites like cameramemoryspeed.com because I was tired of guessing which brands were actually legit. Honestly, I have been incredibly satisfied with these two for the last year or so:

• Delkin Devices BLACK UHS-II V90 128GB - these are literal tanks. No ribs to break off and no flimsy write-protect switch. They handle the R6 buffer like its nothing and I never have to wait.
• Lexar Professional 2000x 128GB SDXC UHS-II V90 - super fast and I havent had a single write error in over 50k frames. The big thing to understand is sustained write speed vs burst speed. Cheap cards might peak high but they throttle hard when they get warm or when the buffer fills up. These V90 cards keep that data pipe wide open so you can actually keep clicking. If you are shooting a Chicago wedding this weekend, you definitely want that peace of mind...