Great card, delivers the promised speed of 95mbps. Sequential read speed is right at the advertised speed, and the write is lower (as expected) at around 45mbps. Still a very good number for a SDXC card at this price. If you plan on using this for a Raspberry Pie or similar, I would look elsewhere however, the random 4k read and write are quite slow. Used for a video camera or even a DSLR this won't matter, but for an OS type scenario you'll notice it. Overall a fantastic card and worth every penny of 44 bucks. Ran Crystal Disk Mark 5.1.2 with Transcend USB 3.0 Card Reader (TS-RDF5K) on a USB 3.0 port.
The results are quite interesting. You'll see that this SD card is actually faster than most hard drives. Random read 4k is at 1542 IOPS (a fast disk drive will yield 150-200 IOPS). Random Read is nearly the same on 4k, both great numbers for an inexpensive SD card. The card is rated at UHS-1 U3 and should work well for 4k recording.
Sequential Read (Q= 32,T= 1) : 94.568 MB/s
Sequential Write (Q= 32,T= 1) : 66.713 MB/s
Random Read 4KiB (Q= 32,T= 1) : 6.316 MB/s [ 1542.0 IOPS]
Random Write 4KiB (Q= 32,T= 1) : 1.090 MB/s [ 266.1 IOPS]
Sequential Read (T= 1) : 93.592 MB/s
Sequential Write (T= 1) : 44.869 MB/s
Random Read 4KiB (Q= 1,T= 1) : 6.193 MB/s [ 1512.0 IOPS]
Random Write 4KiB (Q= 1,T= 1) : 0.855 MB/s [ 208.7 IOPS]
Very happy with the product, will purchase more.
Note: You'll see people have different read/write speeds on these cards. A lot of it has to do with the testing platform. Mine:
X5650 @4.2ghz
48gb DDR3
500gb 850 pro SSD
Asus Sabertooth x58
Transcend TS-RDF5K USB 3.0
| Color | Black |
|---|---|
| Special Feature | water_proof, magnetic_proof, temperature_proof, shock_proof |
| Item Weight | 0.05 Ounces |
| Write Speed | 95 MB per second |
| Hardware Interface | SDXC |
| Secure Digital Association Speed Class | Class 10 |
| RAM | 512 GB |
