The Sandisk Extreme Pro UHS-II memory card is a top performer among UHS-II memory cards. There are two UHS-II memory cards by Sandisk, one that read and writes close to 300MB/s and one that is limited to 280MB/s. Of the two the 300MB/s card is superior, not just because it’s faster, but because it also performs really well in UHS-I devices.
You can see which is which by looking for the 300MB/s label on the card.
Sandisk Extreme Pro 300Mb/s UHS-II Memory Card Sizes
The Sandisk Extreme Pro UHS-II card is available in three sizes – 32GB, 64GB and 128GB.
| Memory Card Name | 32GB | 64GB | 128GB |
| Sandisk Extreme Pro 300 UHS-II | Amazon | Amazon | — |
| B&H | B&H | B&H |
Real World Memory Card Performance
The Sandisk Extreme Pro 300MB/s card has the best combined read and write speeds of any card out there. I’ve seen cards read faster like the Transcend UHS-II, but then it writes a bit slower. This makes the Sandisk Extreme Pro the all around best UHS-II memory card. In terms of in-camera memory card performance, it runs very well in most cameras, but in some cameras like the Sony A9, a couple cards like the Sony and Delkin cards perform a few MB/s faster.
| Memory Card Name | USB 3.0 Read | USB 3.0 Write |
| Sandisk Extreme Pro 300 UHS-II | 263.2 MB/s | 233.4 MB/s |
Compatibility
The Sandisk Extreme Pro UHS-II card can be purchased both as an SDHC (32-bit) and SDXC (64-bit) card. The 64-bit card will be any card 64GB and higher. The limitation of 32-bit will come with a 4GB file size limit.
Speed Class: U3 / Class 10
UHS-I / UHS-II devices
Reliability
Limited Lifetime Warranty
UHS-II USB 3.0 Memory Card Readers
The maximize read speeds from the UHS-II card to your computer, you’ll need to get a good USB 3.0 memory card reader. There are a lot out there now so take a look at this comparison between UHS-II memory cards readers to find out which is the best.