Best SD Cards (2026): Speed-Tested Results for Real Shooters

Not all SD cards perform the way the packaging suggests — and the gap between rated and real-world speeds can be significant. I’ve been benchmarking these cards for years, and the table below covers V90, V60, and UHS-I cards with real tested speeds alongside rated specs. Most V90 cards from reputable brands cluster within about 30 MB/s of each other on write speed, so chasing the top performer often isn’t worth a meaningful price premium. The V60 spread is wider — a few cards fall noticeably short of their rated speeds, which matters when your camera is counting on that sustained write floor.

The Fastest SD Cards Right Now

If your camera requires V90, like the Canon R5 II, Sony A1, and Nikon Z8, start with the V90 picks. Otherwise, V60 is the right call for most UHS-II cameras shooting standard video. All speeds below are write speeds from my reader tests.

	Best V90: Nextorage NX-F2PRO V90. 282 MB/s, tied for the fastest SD card I’ve tested, and the fastest SD card in my Sony A7V and ZV-E10 II in-camera tests. The PNY EliteX-PRO90 (272 MB/s) and Kingston Canvas React Plus V90 (270 MB/s) are close behind.
	Best widely available V90: SanDisk Extreme PRO V90. 282 MB/s at 64GB and 260 MB/s at 128GB. It’s sold almost everywhere and goes up to 2TB, so it’s the easy choice if the Nextorage is out of stock or you need a bigger card.
	Most durable V90: Sony TOUGH G V90. 255 MB/s. It has a one-piece body with no ribs or write-protect switch to break off, which is where most SD cards fail. Only a little slower than the fastest V90 cards, and you won’t notice the difference in most cameras.
	Best V60: Lexar ARMOR Gold V60. 195 MB/s at 128GB, the fastest V60 card I’ve tested, and in-camera it beats some V90 cards. It’s also one of the most durable cards I’ve tested, with a stainless steel body and no write-protect switch. The Lexar 1800x (192 MB/s) is a solid alternative.
	Budget V60: SanDisk Extreme PRO V60 256GB+. 191 MB/s, and consistent across my in-camera tests. Buy 256GB or larger: the 64GB and 128GB versions only tested at 103 MB/s.

Best UHS-I: If your camera only has a UHS-I slot, the Lexar 800x PRO BLUE was the fastest card in my latest round of tests at 132 MB/s write (64GB), and it held that speed through the sustained test. The Lexar SILVER Plus (129 MB/s at 64GB), SanDisk Extreme (127 MB/s at 256–512GB) and SanDisk Extreme Pro (125 MB/s at 128GB) are right behind it. Capacity matters as much as brand here: the 64GB SanDisk Extreme Pro tested at 106 MB/s, well behind its 128GB sibling.

SD Memory Card Benchmarks

I test using AJA System Test with a ProGrade UHS-II card reader on an M4 Mac mini. Results are averaged across multiple passes with the same reference file target for consistent, repeatable results.

Sort memory card results by speed or class to find the fastest SD memory cards. Note that real-world SD card speeds can vary depending on the card reader, computer, or even the USB cable used during testing. A low-quality or incompatible cable may significantly reduce performance.

Reader Speed vs. In-Camera Speed (Sony A7V)

Reader benchmarks tell you what a card can do. In-camera tests tell you what you’ll actually get. I ran 31 UHS-II cards through the Sony A7V, measuring write speed and how long each took to clear a full buffer. Here’s how a handful compare:

Card	Reader Write (MB/s)	A7V In-Camera (MB/s)	Buffer Clear (sec)
Nextorage UHS-II Pro V90	282	225	4.9
Kingston Canvas React Plus V90	270	219	5.0
SanDisk Extreme PRO V90 128GB	260	220	5.2
ProGrade Iridium V90	195	181	6.5
Lexar ARMOR Gold V60 128GB	195	194	5.9
Lexar 1800x V60	192	183	6.5
SanDisk Extreme PRO V60 64–128GB	103	97	13.0
Sony E V60 128GB	101	94	13.4

The fastest V90 cards test at 260–282 MB/s in a reader, but they all land at 219–225 MB/s in the A7V, so the camera tops out there. Below that ceiling, in-camera speed tracks reader speed closely, which is why a strong V60 like the Lexar ARMOR Gold (194 MB/s) beats a slower V90 like the ProGrade Iridium (181 MB/s) in the camera. Full results for all 31 cards are on my Sony A7V memory cards page.

Memory Cards For Canon Cameras

Canon’s latest cameras often use V90 UHS-II SD Memory cards, and their higher-end cameras, like the Canon R5 Mark II, often use a hybrid configuration of a CFexpress Type-B memory card with a UHS-II SD Memory card as the backup slot. In these cameras, using the second SD card slot in a backup configuration will bottleneck the CFExpress card’s performance, so you’ll ideally want to use it for JPGs, since the smaller file sizes won’t take as long to transfer to these slower cards.

There are new CF4.0 memory cards on the market now, but Canon cameras do not yet take advantage of them. In fact, none of the cameras require high-end cards, but Canon recommends using cards with a VPG 400 rating.

List of Canon Cameras with Memory Card Guides

Memory Cards For Nikon Cameras

Nikon uses a mix of SD Memory cards, MicroSD cards, and CFExpress Type-B memory cards in their cameras. The Nikon Zf did something interesting, which is using an SD memory card along with a MicroSD memory card.

Their higher-end models, like the Nikon Z8 and Nikon Z9, use either dual CFexpress cards or a CFexpress card with an SD memory card slot. These high-end cards can shoot RAW video and will require very stable, high-speed CFexpress cards to maintain performance.

Their consumer-focused cameras won’t necessarily require UHS-II SD cards; UHS-I might be ok, so check the guides below.

List of Nikon Cameras with Memory Card Guides

Memory Cards For Sony Cameras

Most mid-range to high-end Sony cameras have a memory card configuration that’s a little different from the other brands. They often use a CFExpress Type-A Memory Card Slot that can also take SD Memory cards. Cameras like the Sony a7IV and a7sIII use this configuration.

Their consumer-focused cameras, like the Sony A7c II, use only a single SD card, but you’ll still want a card with good performance to take advantage of some high-end video features.

Newer bodies like the Sony A7V keep the CFexpress Type A/SD hybrid slot, and which card you put in it matters. In my testing, every CFexpress Type A card wrote at about 310 MB/s in the A7V and cleared the buffer in about 3 seconds, while the fastest SD card took 4.9 seconds and slower V60 cards took 13 to 14.

List of Sony Cameras with Memory Card Guides

Memory Cards For Fujifilm Cameras

Most of the consumer-focused Fujifilm cameras only use a single SD memory card slot, but some will require UHS-II cards depending on the video features offered. Their higher-end cameras, like the Fujifilm X-T5, will use either a dual SD Memory card configuration or a CFexpress Type-B + SD memory card configuration.

List of Fujifilm Cameras with Memory Card Guides

Memory Cards For Panasonic Cameras

Panasonic cameras mostly use SD memory cards, but some of their higher-end Micro Four Third bodies will also use CFexpress Type-B memory cards.

You can learn more about the types of cards their cameras support and see the benchmarks in this guide.

Panasonic Cameras List & Memory Card Guides

Memory Card Types And Performance

What Do All The Numbers And Letters On Memory Cards Mean?

• SDHC indicates that a card uses the 32-bit FAT32 file system. This can have some performance limitations. Some new Speed Classes, such as V30 and V60, aren’t supported by these FAT32 cards. Also, you’ll see a file size limit of around 4GB.
• SDXC indicates that the card will use a 64-bit exFAT file system. This means you get all the technology memory cards have to offer, including the V30 and V60 speed classes and larger file sizes.
• Class 10 is an older designation that is still put on memory cards. There used to be other classes written on memory cards; typically, they were a number inside a circle. Now, every card is pretty much Class 10, and new Speed Classes have come around, like U1 / U3 and V30 / V60, etc. So it’s all getting a little cluttered. Class 10 guarantees a minimum write speed of 10 MB/s.
• U1 / U3 are speed classes, like Class 10, that indicate the minimum write speed a card can achieve. U1 is 10MB/s, and U3 is 30MB/s. Typically, you’ll want the U3 cards if you’re shooting high-bitrate video. Some cameras, like Sony’s, won’t let you use their advanced video codecs without a U3 memory card.
• V30 / V60 / V90 This is the latest speed class. Like Class 10 and U1 / U3, it concerns guaranteed minimum write speeds. V30 = 30MB/s, V60 = 60MB/s, and so forth.
• UHS-I and UHS-II memory cards are built completely differently. UHS-II memory cards are the fastest type of SD memory card because they have a second set of pins that provide dual data lanes for reading and writing. This potentially makes these memory cards twice as fast when used in UHS-II devices.

Potential Memory Card Problems

Memory Card Not Working

There are several reasons a memory card may not work, and I’ll list a few that I’ve seen or have personally dealt with.

1. Bad Memory Card – Not all memory cards are created equal, and you may occasionally find yourself with a bad one. Reputable brands back their cards with long warranties, so if you get stuck with a defective card, you can usually return it to the manufacturer and try a new one.

2. Brand Incompatibility – Memory card brand instability can cause trouble when using different cameras. Certain camera brands, such as Sony, may not be compatible with Samsung memory cards for video recording, and Canon states that some of its cameras do not support Sony cards. To avoid these problems, switch to a different card brand, such as SanDisk, Lexar, or Delkin. These cards tend to work better with most cameras.

3. Mislabeled Sizes – It’s happened a few times over the years when a brand labels its cards wrong. I once had a Delkin card labeled 650GB, but it was actually 1 TB. This is a good problem to have, but be careful, as it could go the other way. You should generally test the size of your cards when you buy them to confirm they match the labeled specs.

4. Memory Card Is Slow – Is your memory card slow? If so, it might be defective or even counterfeit! It is best to purchase memory cards from a trusted source such as BHPhoto, Amazon, or Adorama rather than eBay. This ensures that you are getting an authentic product, not a fake one.

MicroSD and SD Express Cards

It’s important to distinguish between microSD memory cards and standard-sized SD memory cards. While you can use microSD memory cards in a standard SD card slot with an adapter, you cannot use full-size SD cards with microSD card devices. Note that SD Express — the PCIe-based next-gen format — currently exists only as microSD Express (used by the Nintendo Switch 2); no current cameras support it.

Using MicroSD Cards in an SD Card Adapter

This can work if you’re considering using a microSD memory card via an SD adapter for your camera. I have done this, but I have frequently had problems with the card losing connection to the camera. I would then have to remove the card and reseat it in the adapter to work correctly again.