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biz-engineer · 03-26-2019, 07:19 AM

I used 6 types of SD cards, 32G and 64G, they are different R/W speed specifications and a priced differently. Performing a write speed test using a USB3.0 card reader shows that there isn't much difference between the most expensive card and the ones sold at half the price.

Write speeds:

Sandisk Extreme Pro 64Gb 95Mb/s: measured 70.6Mb/s ; Price ~ 25 Eur
Sandisk Extreme 64Gb 150Mb R/60Mb/s W: measured 58.5Mb/s ; Price ~ 18 Eur
Samsung 64 Pro+ 95/90Mb/s: measured 68.5Mb/s ; Price ~ 106 Eur (discontinued)
Transcend 64G, 90Mb/s 600x: measured 58.5Mb/s: Price ~25 Eur.
Transcend 32Gb, 45Mb/s 300x: measured 21.5Mb/s ; Price ~ $15 (discontinued)
Transcend 32Gb, 90Mb/s 600x: measured 25Mb/s ; Price ~ 6.5 Eur.

**ProfessorBuzz** · 03-26-2019, 10:28 AM

The card reader can make a huge difference in performance, as can the device driver, and where the data is going.
.
I have a Kingston and Autek that outperform several other readers. I think I have an old Lexar that is decent too.

Which card reader did you use for your tests?
What are the computer speccs (e.g. i7 3GHz) ?
Storage - SSD, HD, or NVME SSD ?
What software did you use for testing? (e.g. drag and drop with windows explorer, Silky Pix, or a benchmarking program?)

biz-engineer · 03-26-2019, 11:38 AM

Originally posted by ProfessorBuzz

What software did you use for testing? (e.g. drag and drop with windows explorer, Silky Pix, or a benchmarking program?)

I copied a zipped data package from the PC SSD to the USB3 SD card reader. You are right, I suspect that the Sandisk Ext. Pro 64 and Samsung Pro+ should achieve more than 70.6Mb/s. Normal USB3 only should be the limit.

photolady95 · 03-26-2019, 08:14 PM

Not about Ricoh cameras, which is what Product suggestions and feedback forum is about, but about accessories, moved to correct forum.

03-26-2019, 07:19 AM	#1
biz-engineer Pentaxian Join Date: Feb 2015 Photos: Gallery Posts: 12,253	SD card speed test shows not all cards are created equal. I used 6 types of SD cards, 32G and 64G, they are different R/W speed specifications and a priced differently. Performing a write speed test using a USB3.0 card reader shows that there isn't much difference between the most expensive card and the ones sold at half the price. Write speeds: Sandisk Extreme Pro 64Gb 95Mb/s: measured 70.6Mb/s ; Price ~ 25 Eur Sandisk Extreme 64Gb 150Mb R/60Mb/s W: measured 58.5Mb/s ; Price ~ 18 Eur Samsung 64 Pro+ 95/90Mb/s: measured 68.5Mb/s ; Price ~ 106 Eur (discontinued) Transcend 64G, 90Mb/s 600x: measured 58.5Mb/s: Price ~25 Eur. Transcend 32Gb, 45Mb/s 300x: measured 21.5Mb/s ; Price ~ $15 (discontinued) Transcend 32Gb, 90Mb/s 600x: measured 25Mb/s ; Price ~ 6.5 Eur.

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03-26-2019, 10:28 AM	#2
ProfessorBuzz Loyal Site Supporter Join Date: Feb 2018 Posts: 1,903	The card reader can make a huge difference in performance, as can the device driver, and where the data is going. . I have a Kingston and Autek that outperform several other readers. I think I have an old Lexar that is decent too. Which card reader did you use for your tests? What are the computer speccs (e.g. i7 3GHz) ? Storage - SSD, HD, or NVME SSD ? What software did you use for testing? (e.g. drag and drop with windows explorer, Silky Pix, or a benchmarking program?)

03-26-2019, 11:38 AM	#3
biz-engineer Pentaxian Join Date: Feb 2015 Photos: Gallery Posts: 12,253 Original Poster	Originally posted by ProfessorBuzz What software did you use for testing? (e.g. drag and drop with windows explorer, Silky Pix, or a benchmarking program?) I copied a zipped data package from the PC SSD to the USB3 SD card reader. You are right, I suspect that the Sandisk Ext. Pro 64 and Samsung Pro+ should achieve more than 70.6Mb/s. Normal USB3 only should be the limit.

03-26-2019, 08:14 PM	#4
photolady95 Otis Memorial Pentaxian Join Date: May 2009 Location: Cruising the forum watching his back Photos: Gallery \| Albums Posts: 12,712	Not about Ricoh cameras, which is what Product suggestions and feedback forum is about, but about accessories, moved to correct forum.

SD card speed test shows not all cards are created equal.

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