Our test procedure
We strive to cover the widest possible range of test samples and brands. However, in practice it is impossible to test all available memory cards and card readers.
On the one hand, we decided not to test any noname products. In addition to the sometimes questionable legality of the corresponding offers (lack of VAT payments), there are major concerns about warranty services and the reproducibility of test results (other flash modules and controllers, depending on each batch).
On the other hand, the cooperation with the respective providers is very different. For example, some manufacturers are willing to make the complete product portfolio permanently available (Lexar, SanDisk, Toshiba). Other manufacturers may not give test samples permanently due to internal regulations or cannot send test samples to us for a variety of reasons (including Samsung, Sony, Transcend). Test samples are available irregularly from other providers, mostly as part of the announcement of new flagship products (ADATA, Kingston, Panasonic, Patriot Memory, PNY, Verbatim).
CF, XQD and SD memory cards (general rankings)
Our basis (and 25 percent of each result) are synthetic benchmarks of read and write speed with various USB 3.x card readers. To proof the theoretical potential of memory cards and also serve to check the manufacturer's information. Only the best value respectively (highest reading and writing speed) is used in the final calculation.
- Lexar UHS-II SD-Reader
- SanDisk Extreme Pro SD UHS-II
- Satechi USB-C UHS-II
- Kingston FCR-HS4
- Lexar Professional Workflow CFR1
- Tool: ATTO Disk Benchmark 4.00
- System: ValueTech Storage v4.0
Measurements in cameras
The remaining 75 percent of each result is based on the results of the writing speed in various DSLR and DSLM cameras. The weighting is higher, the more advanced technology is used in the camera. This is to ensure that our results both represent a wide range of cameras and also enable a future-proof purchase decision. Information on the test procedure can be found in the section below.
- HS (10 %): Canon EOS 550D
- UHS-I (25 %): Canon EOS 80D, Canon EOS 5Ds, Nikon D3300
- UHS-II (40 %): Canon EOS R, Canon EOS R5, Fujifilm X-Pro3, Nikon Z6 II, Olympus OM-D E-M1X, Panasonic Lumix GH5, Panasonic Lumix S1, Sony Alpha 7 III, Sony Alpha 7s III
- Canon EOS 5D Mark III
- Canon EOS 7D
- Canon EOS 7D Mark II
- Nikon D810
Note: Cameras in brackets  are temporarily excluded because there is no complete data set. Corresponding follow-up tests are carried out as soon as possible.
CompactFlash, SD and XQD cards (in-camera testings)
RAW images are recorded with the respective camera for at least 20 to 30 seconds and the exact time that the camera needs to store the images is stopped. The difference is measured from the first lighting up until the memory LED turns off. Since each picture has a different size, we do not present the value in pictures/second, but divide the overall file size by time to safe all images. This results in a familiar MB/s value.
Cardreader (SD, CompactFlash)
Since the read speed is often the only relevant benchmark for card readers, the mean value only takes this into account. In the case of SD card readers, the measured values from UHS-I and UHS-II memory cards are averaged equally. The writing speed is of course given separately in the tables.
Memory cards from Angelbird and Toshiba are used to measure the speed since both companies do not offer their own card readers. As a result, optimizations that can occur when combining card readers and memory cards from the same manufacturer are excluded as good as possible.
- SDXC UHS-II: Angelbird AV Pro V90 (64 GB)
- SDHC UHS-I: Toshiba Exceria Type 1 (32 GB)
- CompactFlash: Toshiba Exceria Pro 1066x (32 GB)
The measurements are done by the ATTO Disk Benchmark with a block size of 8 MB.