Best SD cards for Lumix S5 II 6K recording?

Question

Hey everyone — I just picked up a Lumix S5 II and I’m planning to shoot a lot of 6K (mostly 6K open gate) for short films and some run-and-gun stuff. I’m getting a little overwhelmed by SD card specs and all the conflicting advice.

I know the camera has dual SD slots, and I’m trying to figure out what actually matters for reliable 6K recording: V60 vs V90, UHS-I vs UHS-II, and whether “up to” write speeds on the box mean anything in real-world video. I’d prefer not to overspend if V60 is truly enough, but I also don’t want dropped frames or the camera stopping mid-take.

Ideally I’m looking for cards in the 128GB–256GB range, and I’d like to use the second slot for backup/relay recording if possible. Also curious if some brands/cards run hotter or get flaky during longer takes.

What specific SD cards are you using for S5 II 6K recording (exact model and speed class), and have you had any issues with recording reliability or buffer limits?

EdwardRency · Accepted Answer

Big warning from someone who’s been burned before: don’t trust the “up to 300MB/s” numbers on the front of the package for video… sustained write is what bites you mid-take.

Just sharing my experience: I ran 6K open gate on my S5 II with a pair of ProGrade Digital SDXC UHS-II 256GB V60 U3 cards for months doing 20–40 min interview-style takes and lots of stop/start run-and-gun. No dropped frames, but I did get one “recording stopped” event early on when I mixed in an older UHS-I card in slot 2 for backup (my bad). Also, heat-wise, the cards were warm but never scary—what seemed to matter more was keeping both cards the same class/speed so the camera doesn’t get weird. 🙂

Hope this helps!

susanthoma · Answer

To add to the point above: for 6K open gate on the S5 II, I’d stick to **UHS‑II V60** for value. V90 is awesome, but IMO it’s mostly “buy once, cry once” insurance unless you’re constantly pushing the highest bitrates.

- What actually matters: the **V rating** (guaranteed sustained write), not the “up to 300MB/s” marketing number.
- My cards that have been boringly reliable (long takes, warm days, no weird stops):
- ProGrade Digital SDXC UHS-II V60 256GB U3
- Kingston Canvas React Plus SDXC UHS-II V60 128GB U3
- Dual slots: I run **backup recording** with matching cards when possible; if you mix a slower card, the camera’s gonna be limited by the weaker link.

FWIW I’ve been happy with V60 for years… no complaints. Hope this helps!

ScarletBreeze · Answer

For your situation, I’d suggest UHS‑II V60 as the sweet spot for 6K on the S5 II—“up to” speeds are marketing; the V-rating matters. I’ve been solid with:
- SanDisk Extreme PRO SDXC UHS-II 256GB V60 U3
- Lexar Professional 2000x SDXC UHS-II 128GB V60 U3
V90 is nice but IMO mostly overspend unless you’re pushing the highest bitrates nonstop. For backup/relay, make sure both cards are UHS‑II V60+ (mixed cards can bottleneck). Let me know your codec/bitrate settings and I can sanity-check.