Originally Posted by fedor12
Have you ran a benchmark on your phone/tablet using the a1 sd app? It would be interesting to know what you're getting as i can't seem to get higher than 34-35mb read and 21mb write despite it being advertised as 90mb read and 80mb write, i know I'm unlikely to ever reach those numbers but i was expecting more than what I'm currently getting.
I ran the A1 SD app on both my Galaxy Tab Pro 8.4 and my Galaxy S5 which both have Samsung Pro SD cards and didn't achieve much higher benchmarks than you did. This is because of the limitations of the SD controller chip in nearly all phones and tablets. These devices don't need those kinds of speeds that are the upper end of these Pro cards. You'll need something like a high-end DSLR camera if you wish to take full advantage of these cards.
I saw some of the posted results on the community page for A1 and a lot of those high results look suspect. I only bought the Pro cards myself because they weren't much more than the Evo ones and I may use them in a high speed device someday. My main attraction to Samsung SD cards was that they are water-proof, X-Ray-proof, and magnetic-proof.
Bottom line, I don't think there's anything wrong with the Pro card you bought, but you didn't gain any speed benefits upgrading from your Evo card due to hardware limitations of your device(s).