PC Perspective took a look at eight SD memory cards from PNY, ATP, SanDisk, OCZ, Corsair and Kingston.
On any given SD card package you will invariably encounter statements like “50x performance!” or “10 MB/s”. Basically SD cards are rated as multiples of 150 kB/s (which is the same way ratings on CD-ROMs are given). So 66x speed rating is 9900 kB/s or approximately 10 MB/s.
We’re going to throw away all the manufacturer’s specifications and do our own testing to see how each of these SD cards stack up. To test these cards we test using an integrated SD card reader on two different notebooks, and a USB card reader.