Secure Digital SD Card Roundup - 8 cards compared
Read/Write Performance with SiSoft Sandra
The popular benchmarking and system reporting software Sandra by SiSoft has a benchmark for removable storage. This test performs reading and writing of files 512 Bytes to 64MB to disk and records how quickly these operations are done.
Using this test, we run it on our SD cards using both the USB card reader and the integrated reader on the Asus Z96J notebook.
Results from SiSoft Sandra XI using the Integrated Reader
Using SiSoft Sandra, we get some really surprising results. First off, the integrated reader is much slower than the USB reader with all cards showing read speeds below the 3.5 MB/s rate. All cards are clustered together with little difference except at the 64MB mark which is a bit unusual.
Results from SiSoft Sandra XI using the USB Reader
The USB reader, on the other hand, shows result that make a bit more sense with three distinct groupings at 16MB/s, another at 12 MB/s, and the rest at 10 MB/s. The big news here is the PNY 60x (30) card which comes out on top and out performs faster rated cards like the OCZ 150x and the PNY 100x. The PNY 100x and the OCZ 80x bring up the middle cluster, and the ATP 60x, Sandisk Ultra II, and the Kingston 1GB card follow in the rear at 10MB/s.
Using the integrated SD card reader, the Sandisk Ultra II really shines with the fastest results at 64MB files. However, with other file sizes, the PNY 60x is the big winner beating faster rated cards. You should take these tests with the integrated reader with a big grain of salt because the results are not what is expected. USB test results appear to be much more realistic, so here they are:
If you go by the markings provided by the different manufacturers, we see a nice staggering of results at the 64MB test with the fastest rated OCZ 150x at the top and the Kinston 1GB at the bottom.
The PNY 100x and Sandisk Ultra II cards performs really well. The ATP 60x also does extremely well in every test beating most cards until it hits the 64 MB test, at which point it just gives up.