If you need a 512GB microSD card for a smartphone, tablet, action camera, or gaming handheld, the choice comes down to speed ratings and price. All three cards here share the same UHS-I bus and 512GB capacity, but their performance classes and real-world use cases differ dramatically. This guide breaks down the Samsung Evo Plus (2021), the Sandisk Nintendo Switch edition, and the Sandisk Ultra to help you avoid overpaying for features you don't need — or buying a card that can't keep up with your device.
| Specification | Samsung Evo Plus (2021) microSDXC 512GB Class 10 U3 V30 A2 UHS-I | Sandisk Nintendo Switch microSDXC 512GB Class 10 U3 V30 UHS-I | Sandisk Ultra microSDXC 512GB Class 10 U1 A1 UHS-I |
|---|---|---|---|
| UHS Speed Class | U3 | U3 | U1 |
| Application Class | A2 | — | A1 |
| Reading Speed | 130 MB/s | 100 MB/s | 150 MB/s |
| Recommended use | Smartphone & Tablet, Gaming, Action Camera | Action Camera | Smartphone & Tablet, Gaming |
| Write Speed | — | 90 MB/s | 150 MB/s |
| Capacity | 512 GB | 512 GB | 512 GB |
| Type | microSDXC | microSDXC | microSDXC |
| Bus Speed | UHS-I | UHS-I | UHS-I |
| Speed Class | 10 | 10 | 10 |
| Video Speed Class | V30 | V30 | — |
Samsung Evo Plus (2021) microSDXC 512GB Class 10 U3 V30 A2 UHS-I
The Samsung Evo Plus (2021) is the best value in this group. It offers a strong 130 MB/s read speed, a V30 video rating for smooth 4K recording, and an A2 app-performance class that ensures fast loading on smartphones and tablets. Its only weakness is the lack of a published write speed, but at $36.30 it's a steal for action camera users and gamers who want reliable performance without the Nintendo tax.
Sandisk Nintendo Switch microSDXC 512GB Class 10 U3 V30 UHS-I
The Sandisk Nintendo Switch microSDXC is the most expensive option at $90, yet it delivers the slowest read speed (100 MB/s) and lacks an A2 rating. Its 90 MB/s write speed is decent for recording, but the premium price is purely for the Nintendo branding and license. Ideal only for Switch owners who want official compatibility and don't mind paying double for a card that performs worse than cheaper alternatives.
Sandisk Ultra microSDXC 512GB Class 10 U1 A1 UHS-I
The Sandisk Ultra boasts the highest claimed read and write speeds (150 MB/s each), but its U1 and A1 ratings are a red flag. U1 means it can't guarantee sustained 4K video recording, and A1 offers slower random read/write for apps compared to A2. At $60, it's a decent budget pick for basic smartphone storage or older devices, but avoid it for action cameras, 4K video, or heavy gaming.
The bottom line
For most users, the Samsung Evo Plus (2021) is the clear winner. It delivers the fastest read speeds (130 MB/s) among the three, carries the premium A2 app-performance rating, and costs just $36.30 — less than half the price of the Sandisk Nintendo Switch card. The Sandisk Ultra is faster on paper (150 MB/s read/write) but its U1 and A1 ratings mean it will struggle with 4K video recording and heavy app loading, making it a poor fit for action cameras or demanding games. The Nintendo Switch-branded Sandisk is overpriced at $90 for slower read speeds (100 MB/s) and no A2 rating, so only buy it if you absolutely need the official Nintendo license for warranty peace of mind.
Our pick: Samsung Evo Plus (2021) microSDXC 512GB Class 10 U3 V30 A2 UHS-I