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Samsung’s P9 Express is a genuine Nintendo Switch 2-compatible microSD Express card, but its headline 800 MB/s figure needs context. Samsung announced the card on November 4, 2025—not as a new debut today—and measured that speed as a maximum sequential-read result on a 512GB card using a PCIe test board. It is not a guarantee that Switch 2 games will load at 800 MB/s or four times faster.
The P9 Express is worth considering when discounted near its launch price. At the Samsung US prices listed on August 16, 2026—$79.99 for 256GB and $199.99 for 512GB—it is not automatically the best value, especially for buyers who need 1TB or more.
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Samsung P9 Express: quick verdict
- It is real: Samsung announced its first microSD Express line on November 4, 2025.
- It fits Switch 2: The console requires microSD Express for expandable game storage.
- The headline is conditional: “Up to 800 MB/s” means sequential read performance in SD Express mode under Samsung’s test conditions.
- Buy on price: The P9 Express makes the most sense near its $54.99 launch MSRP for 256GB or $99.99 launch MSRP for 512GB, rather than at inflated prices.
- Capacity is limited: Samsung’s documented lineup includes 256GB and 512GB models, while Nintendo supports microSD Express cards up to 2TB.
Samsung markets the P9 Express for next-generation gaming and Switch 2 expansion. That makes it a valid storage upgrade, but not proof that every game will load four times faster than it does from a conventional card.
What is the Samsung P9 Express?
The P9 Express is a microSD Express card using a PCIe Gen 3.0 ×1 interface and NVMe 1.3. That is fundamentally different from the conventional UHS-I microSD cards commonly used in the original Nintendo Switch.
#1 Best Overall
- TRANSFER SPEEDS UP TO 800 MB/S: With sequential read speeds up to 800 MB/s, get into your game up to 4× faster than our standard microSD cards (UHS I)¹.
- DYNAMIC THERMAL GUARD: Keeps its cool even when the action heats up. Dynamic Thermal Guard helps reduce overheating for fast, smooth gameplay.
- ALL YOUR GAMES ON ONE TINY CARD: Store all your games and downloadable content (DLCs) with up to 512GB of reliable storage. No deleting. No compromises.
- 6-PROOF PROTECTION WITH 3-YEAR LIMITED WARRANTY: Built to last, made for peace of mind. Anything can happen when you’re gaming on the go. With 6 types of protection²⁻⁹, the P9 Express can handle it all—helping maintain your game progress.
- NEXT-GEN AND BACKWARD COMPATIBLE: Your microSD Express card is compatible with Nintendo Switch 2¹⁰ and microSD UHS-I¹¹ devices, including tablets, drones, cameras and more.
| Specification | Samsung P9 Express |
|---|---|
| Capacities | 256GB and 512GB |
| Interface | PCIe Gen 3.0 ×1 |
| Protocol | NVMe 1.3 |
| SD standard | SD 7.1 |
| Maximum sequential read | Up to 800 MB/s in SD Express mode |
| UHS-I read speed | Up to 90 MB/s |
| Speed ratings | Class 10, U3, V30, A1 |
| Random read | 65K IOPS at QD32; 9K IOPS at QD1 |
| Random write | 52K IOPS at QD32; 30K IOPS at QD1 |
| Features | HMB and Samsung Dynamic Thermal Guard |
| Protection | Samsung advertises six-proof protection |
| Warranty | Three-year limited warranty |
| Operating temperature | 0°C to 45°C |
| Non-operating temperature | -40°C to 85°C |
The official model numbers surfaced in Samsung’s documentation are MB-MK256T for 256GB and MB-MK512T for 512GB, with U.S. retail variants adding the /AM suffix.
Samsung’s six-proof description and Dynamic Thermal Guard are useful durability and temperature-management features, but neither means the card will maintain its maximum benchmark speed during every sustained workload. The three-year warranty is limited and subject to Samsung’s terms.
Samsung’s official datasheet provides the detailed specifications.
Why Switch 2 needs a microSD Express card
The original Nintendo Switch accepts conventional microSD cards for downloadable games and other data. Switch 2 changes that storage requirement: normal expandable storage for games must use microSD Express.
An ordinary UHS-I microSD card may still be useful for limited transfer of screenshots and videos from an older Switch, but it cannot serve as regular game storage on Switch 2. Nintendo says microSD Express is required for faster access and smooth game operation, and supports cards up to 2TB.
That means labels such as “microSDXC,” “UHS-I,” “A2,” or “high speed” are not enough. The packaging or listing must specifically identify the card as microSD Express.
See Nintendo’s compatibility guidance and microSD Express FAQ.
Rank #2
- TRANSFER SPEEDS UP TO 800 MB/S: With sequential read speeds up to 800 MB/s, get into your game up to 4× faster than our standard microSD cards (UHS I)¹.
- DYNAMIC THERMAL GUARD: Keeps its cool even when the action heats up. Dynamic Thermal Guard helps reduce overheating for fast, smooth gameplay.
- ALL YOUR GAMES ON ONE TINY CARD: Store all your games and downloadable content (DLCs) with up to 512GB of reliable storage. No deleting. No compromises.
- 6-PROOF PROTECTION WITH 3-YEAR LIMITED WARRANTY: Built to last, made for peace of mind. Anything can happen when you’re gaming on the go. With 6 types of protection²⁻⁹, the P9 Express can handle it all—helping maintain your game progress.
- NEXT-GEN AND BACKWARD COMPATIBLE: Your microSD Express card is compatible with Nintendo Switch 2¹⁰ and microSD UHS-I¹¹ devices, including tablets, drones, cameras and more.
What does 800 MB/s actually mean?
Sequential read speed measures how quickly a device can read a large, continuous block of data. That can help with large-file transfers and some storage-loading operations, but it is not the same as a guaranteed game-loading time.
Samsung’s 800 MB/s maximum was measured on a 512GB card with a PCIe test board. Actual performance varies according to the host device, interface, software, workload, thermal conditions and other factors. In a UHS-I host, Samsung lists the card at up to 90 MB/s instead.
On Switch 2, the console’s storage interface, game engine, file compression, CPU decompression and software-management behavior can all become bottlenecks. Consequently, the P9 Express has the bandwidth to meet the console’s microSD Express requirement, but the benchmark should not be translated directly into an 800 MB/s console experience.
Samsung also describes the card as up to four times faster than conventional UHS-I cards under its stated test conditions. That comparison should not be read as a promise of a fourfold reduction in launch times for every Switch 2 game.
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Independent coverage has found the P9 Express competitive with other microSD Express cards, while also noting that some competing products advertise or measure higher sequential performance. Without controlled, console-level testing, there is no reliable percentage improvement to promise. Tom’s Hardware and TechRadar provide useful comparison context.
What can be stored on a Switch 2 microSD Express card?
Nintendo says the card can store:
- Downloadable software
- Software update data
- Downloadable content
- Screenshots and captured gameplay video
Game save data is not stored on the microSD Express card. Save data remains in system memory. A larger card gives you room for more installed games; it does not replace Nintendo’s account, backup or cloud-save protections.
Nintendo recommends using one card. Software spread across multiple cards cannot simply be merged automatically later. If you upgrade, copy the contents of the old card to the new one using Nintendo’s specified method rather than assuming that inserting both cards will combine the library.
Rank #3
- Compatible with a variety of devices: Nintendo Switch 2 has been verified, PC, smartphone, camera, etc
- Transfer speed: Up to 800 MB/s (SD Express). *Transfer rate may be limited to UHS-I speed depending on host device compatibility
- Interface: PCIe Gen 3.0 x1, NVMe 1.3, SD 7.1 / UHS-I SDR 104
- [Durable] Water resistant, heat resistant, X-ray proof, magnetic proof, fall proof, wear-resistant
- [Warranty] Data loss. Only products sold by authorized stores are covered by warranty and support
256GB or 512GB?
Choose 256GB if:
- You have a smaller digital library.
- You regularly archive games you are not playing.
- The card is heavily discounted.
- You want the lower upfront cost.
Choose 512GB if:
- You buy many games digitally.
- You want to keep more large games installed.
- You would rather avoid frequent deletion and redownloading.
A 512GB card is not automatically faster for game loading than a 256GB card. Capacity and speed are separate decisions, and both models carry the same headline maximum read claim in Samsung’s published material.
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Samsung launched the P9 Express at $54.99 for 256GB and $99.99 for 512GB in the U.S. Samsung’s U.S. product pages listed $79.99 for 256GB and $199.99 for 512GB when checked on August 16, 2026. Product availability and fulfillment can vary by location.
A temporary June 23, 2026 promotion reportedly reduced the 256GB model to $39.99, but that was a dated deal rather than a dependable current price. Check the live listing before buying:
At or below launch pricing, the P9 Express is a reasonable mainstream-brand choice. At $199.99 for 512GB, its value is much harder to defend unless Samsung’s warranty, protection features or a particular retailer’s return policy matter more to you than capacity per dollar.
How it compares with alternatives
SanDisk, PNY, Lexar and Nintendo-licensed brands also offer relevant microSD Express categories. Some competing cards advertise higher speeds or larger capacities, so the P9 Express should not be called the fastest card without a current, controlled comparison.
Nintendo licensing is not a technical requirement. Nintendo’s rule is that a microSD Express card meeting the standard and supported capacity limit—up to 2TB—can be used. A Nintendo-branded card may appeal to buyers who prioritize official branding, but branding alone does not guarantee better Switch 2 performance.
Compare the exact model, capacity, current price, warranty and return policy. Do not compare a P9 Express card with an ordinary Samsung UHS-I card simply because both use the Samsung name.
Rank #4
- YOUR GAMING EXPERIENCE, REDEFINED: Upgrade your Nintendo Switch 2! The Samsung P9 Express micro SD card offers lightning-fast charging times and smooth gameplay for unlimited fun with 800 MB/s.
- Speed that makes the difference: Experience fast charging times on game consoles and 4K performance in cameras with the Samsung P9 Express microSD Express memory card. Robust, reliable and with storage space for all your adventures.
- Simply plug in and go: insert the Samsung P9 Express micro SD Express card into the slot of your Nintendo Switch 2 or other compatible device. Format them as needed and enjoy more storage instantly.
- MORE THAN JUST FAST - ABSOLUTELY SECURE: Your data is safe. The 6-way protection protects your games and memories from water, extreme temperatures, X-rays, magnets, drops and wear.
- INCLUDED: You will receive one (1) Samsung P9 Express microSDXC Express memory card with a capacity of 256 GB. Ready for immediate use in your Nintendo Switch 2, other consoles or cameras.
SanDisk’s compatibility page also explains the distinction between UHS-I and microSD Express cards.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Installation and migration
- Connect the Switch 2 to the internet and install the required system update before or during first-time microSD Express setup.
- Power the console completely off before inserting or removing the card.
- Insert the P9 Express into the console’s microSD slot.
- Follow the on-screen initialization or formatting instructions.
- Check the console’s storage-management area to confirm that the card is recognized.
- Confirm that new downloadable software is directed to the card if that is your preferred storage location.
Menu labels can change with system software, so follow the wording shown on your console rather than relying on an old screenshot or guide.
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Troubleshooting
The Switch 2 does not recognize the card
- Confirm that the card is labeled microSD Express, not merely microSDXC or UHS-I.
- Install the required internet system update.
- Power down the console, remove and reinsert the card, then restart.
- Check that the card is the correct model and has not been physically damaged.
- If possible, test it in another compatible SD Express reader or device.
You are moving from an original Switch
An old conventional microSD card cannot simply become Switch 2 game storage. Follow Nintendo’s transfer process and redownload software through the relevant Nintendo Account when necessary.
You are considering formatting
Formatting erases the card. Do it only after confirming that important downloadable data is backed up or recoverable. Redownloadable games and DLC can generally be recovered through the Nintendo Account, but that is separate from save-data recovery, which follows Nintendo’s account and cloud-save rules.
Should you buy the Samsung P9 Express?
Buy it if you need a Switch 2-compatible microSD Express card, 256GB or 512GB is enough, and the price is near launch MSRP or below. Samsung’s brand, three-year limited warranty and published durability features make it a sensible option.
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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesConsider another card if you need 1TB or more, a competitor offers substantially better capacity per dollar, or independent testing and warranty terms favor another model. Do not pay a large premium solely for the 800 MB/s label.
Best Value
- ADAPTER INCLUDED: Your microSD card includes a Samsung adapter that works with your computer, handheld gaming console, tablet or camera—and virtually any device with an SD card slot; Transfer files with no fuss— and no need to hunt for extra tech
- READ/WRITE SPEEDS UP TO 160 MB/s: The EVO Plus is ready to save real-time moments with ultrafast transfer speeds of up to 160 MB/s; Transfer everything instantly and capture each memory as it comes with an SD that keeps up with your real life¹
- STORAGE CAPACITIES FROM 64GB - 1TB: Save every second in mere minutes with storage capacities ranging from 64GB to 1TB; It’s always reliable with the right amount of space to fit your lifestyle, so you can hold on to the things that matter most
- U3, CLASS 10, A2, V30 & UHS-I INTERFACE: Ultra-high-speeds; Crystal clear 4K UHD video and content complete with the latest U3 and V30 speeds for faster transfers and more memory² on-the-spot, all while recording full HD 1080p and 3D video, too
- 6 PROOF PROTECTION w/ 10-YEAR LIMITED WARRANTY: The Samsung EVO Select microSD is tough enough to take on anything; With protection covering everything from water to extreme temperatures— it can handle wear and tear⁴⁻¹¹
The P9 Express is therefore a legitimate Switch 2 storage upgrade—not a guaranteed 800 MB/s game loader. Its recommendation depends more on the price and capacity you need than on the headline number alone.
Frequently Asked Questions
Does the Samsung P9 Express work in the original Nintendo Switch?
It is designed for microSD Express-capable devices and is primarily positioned for Switch 2. The original Switch uses conventional microSD storage and does not provide the same SD Express performance.
Can a normal microSD card store games on Switch 2?
No. Switch 2 requires a microSD Express card for normal expandable game storage. Ordinary cards may have limited use for importing screenshots and videos.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallDoes the P9 Express store game saves?
No. Switch 2 game save data remains in system memory, not on the microSD Express card.
Is 800 MB/s guaranteed on Switch 2?
No. It is Samsung’s maximum sequential-read figure measured on a 512GB card with a PCIe test board. Console performance varies by host and workload.
Can multiple Switch 2 microSD cards be merged into one library?
Nintendo recommends using one card. Data spread across multiple cards cannot automatically be merged later; copy the contents to a larger replacement card when upgrading.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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