Not all microSD cards are equal, and the marketing numbers on the packaging rarely match real-world results. I’ve run 41 cards through sequential and random read/write benchmarks to find out what actually performs for action cameras, drones, handheld consoles, and photography. Here’s what the data shows.
Table of Contents
The Fastest MicroSD Right Now
The table below is sorted by sequential write speed — the number that actually matters for recording video. Sequential write determines whether a card can sustain the data rate your camera or action camera needs without dropping frames or throwing an error mid-clip. Read speed is largely irrelevant for recording; it only comes into play when transferring footage off the card.
A note on UHS-II cards: I’ve excluded them from this list — their main value is transfer speed when offloading footage to a computer, not for in-device recording. The Lexar 1800x hits 290 MB/s write speed, but only with a UHS-II card reader. No current action cameras or drones have UHS-II hardware, so in-device speeds are capped at UHS-I regardless of the card. The overall fastest UHS-I card in my tests, the Lexar Silver Plus, read at 177 MB/s and wrote at 151 MB/s — fast enough for everything these devices can shoot.
MicroSD Memory Card Benchmarks
How I Test
Sequential benchmarks were run using AJA System Test on a Windows 11 machine with a ProGrade USB-C 10 Gbps card reader. I use a 5120×2700 5K Red 16-bit RGBA file target — the same format AJA uses for high-end video production workflows — which delivers consistent, repeatable results without being inflated by small file sizes.
Random read and write speeds were tested separately on a Retroid Pocket 5 running Android 13, since it exposes the full range of IOPS data in a way most desktop tools don’t. This matters specifically for handheld console performance, where random read speed affects load times more than sequential throughput.
A note on capacity: most cards in this test are 128GB. Some manufacturers bin their NAND differently across capacities, meaning a 64GB and 256GB version of the same card can have meaningfully different write speeds. Where I’ve seen that in the data, I’ve broken those out separately. If you’re buying a different size than what I tested, check the spec sheet — the rated write speed on the packaging is the number to compare.
Every card was tested cold, formatted fresh, and run through at least three passes before recording results.
Best for Action Cameras and Drones
For action cameras and drones, sequential write speed matters — specifically, sustained sequential write speed, not burst. Video data is written to the card continuously in large blocks, so random read/write performance and IOPS are largely irrelevant here.
What You Actually Want
What you actually want is V30 (U3), which guarantees 30 MB/s sustained write. That’s the real-world ceiling for action cameras and drones, and it’s enough to handle 4K at the bitrates these devices shoot at. Anything rated V30/U3 from a reputable brand will do the job.
The strongest performer in this category from my tests is the Lexar Silver Plus — 151 MB/s write, consistent across multiple passes without throttling. For a budget option that still clears V30 reliably, the SanDisk Extreme writes at 96 MB/s and is widely available at most retailers.
One thing that matters more for this use case than card readers or cameras is durability. MicroSD cards in drones and action cameras take more physical abuse — from drops, water and temperature swings. All the cards I’d recommend here are rated for at least -25°C to 85°C and IP67 water resistance. Check that spec if you’re shooting in rough conditions.
What Not To Buy
Every action camera and drone on the market today uses a UHS-I slot. That’s an important point because it means V60 and V90 speed-class ratings are effectively irrelevant for these devices — those speeds require UHS-II hardware, and none of these cameras have it. A V60 UHS-II card will work in a GoPro or DJI drone, but it’ll run at UHS-I speeds. You’re paying for a performance the device can’t use.
MicroSD Express: For Nintendo Switch 2
The Nintendo Switch 2 requires MicroSD Express cards. Standard microSD cards — including fast UHS-I and UHS-II options — are not compatible. This isn’t a marketing footnote; the Switch 2 uses the PCIe/NVMe interface that MicroSD Express runs on, which is fundamentally different from the older UHS bus.
MicroSD Express cards look identical to standard microSD cards but have a small notch on the back contact edge. The speed difference is significant — conventional microSD tops out around 300 MB/s in the best cases, while MicroSD Express can reach 800 MB/s or more on compatible hardware.
One thing to keep in mind: MicroSD Express cards are backward compatible — they work in any standard microSD slot, including action cameras, drones, phones, and handheld consoles that don’t support the Express interface. In those devices, they’ll run at regular UHS-I speeds. The speed advantage only activates when the host hardware supports the PCIe/NVMe bus. So if you’re buying an Express card now, you can use it in your current gear without compatibility issues.
Memory Card Ratings and Numbers: Speed Classes Explained
The ratings and letters on microSD packaging are genuinely confusing because they measure different things. Here’s what each one actually means and which ones matter for your use case.
EX
EX stands for Express, a new microSD card that offers significantly faster read and write speeds, making it ideal for console gamers on the Nintendo Switch 2.
A1 vs A2
A1 and A2 ratings describe minimum random read/write performance — relevant for running apps from the card, not for video recording. A1 guarantees 1500 IOPS random read and 500 IOPS random write. A2 raises that to 4000 IOPS read and 2000 IOPS write, with a caching system that benefits handheld consoles and Android devices more than cameras.
U1 / U3 / V30 / V60 / V90
These are minimum sustained sequential write speed guarantees. U1 and V10 = 10 MB/s minimum. U3 and V30 = 30 MB/s minimum. V60 = 60 MB/s minimum. V90 = 90 MB/s minimum. For action cameras and drones, V30/U3 is the target — anything above that is more than these devices can use.
UHS-I vs UHS-II
UHS-I and UHS-II refer to the bus interface, not the speed class. UHS-II adds a second row of pins and a second data lane, which significantly increases maximum transfer speeds — but only when the device also has UHS-II hardware. No current action cameras or drones have UHS-II slots. Where UHS-II matters: offloading footage to a computer via a UHS-II card reader.
Best Micro SD Memory Card Conclusion
For action cameras, drones, and most cameras with a microSD slot, the Lexar Silver Plus is the card I’d buy — fastest UHS-I write speed in my tests at 151 MB/s, well above what any of these devices actually need. If budget matters more than peak performance, the SanDisk Extreme at 96 MB/s write covers every action camera and drone on the market without overpaying. For handheld consoles where random read speed matters as much as sequential, check the random read column in the benchmarks table — that’s the number that affects load times. And if you’re buying for a Nintendo Switch 2, none of the UHS-I cards here will work — you need MicroSD Express specifically.
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