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64Gb 80Mb/s SD card: $31.95
Posted By: Adam, 07-08-2014, 03:20 PM

Samsung 64GB SDXC Pro UHS-1 Class 10 Memory Card, Upto 80MB/s Read, Upto 40MB/s Write Speed

Samsung 64GB SDXC Pro UHS-1 Class 10 Memory Card MB-SGCGB/AM

Regular Price $79.95
Special Price $31.95 + free US shipping

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07-17-2014, 10:17 PM - 1 Like   #16
dosdan's Avatar

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Write speed is a little low with this model (40MB/s), but far better than the Ultra. Faster write speed should help with speeding up the K-3 buffer clearance rate.

An alternative is the PNY 64GB Elite UHS-1 card for $34.99 USD. PNY 64GB SDXC Elite Performance UHS-1 90MB/sec: Electronics

For my K-3, I've got this card as a backup as well as the Sandisk Extreme Pro 64GB UHS-1 card. Both these cards write faster than that particular Samsung card.

Using H2testw with an ext. USB 3 card reader, the performance of the PNY card is:
Writing speed: 61.2 MByte/s
Reading speed: 82.5 MByte/s

These figures are in true MB (1,048,576 bytes). If using 1 MB = 1,000,000 bytes, as the HDD and memory storage industries do, these results would be:
Writing speed: 64.5 MByte/s
Reading speed: 86.5 MByte/s
This was with 128KB clusters, which is what the K-3 uses when formatting the card. If you are a raw shooter, with the bigger resulting files, a 512KB cluster size gives slightly better results without being too wasteful.

The much more expensive Sandisk Extreme Pro 64 GB measures:
Writing speed: 81.6 MByte/s
Reading speed: 83.7 MByte/s
In 10^6 MB that's:
Writing speed: 85.5 MByte/s
Reading speed: 87.8 MByte/s


Last edited by dosdan; 07-19-2014 at 01:41 PM.

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