Ive noticed something recently. Almost a year ago i bought an sd with my acekard 2i. It was a san disk 4gb micro sd class 2. It works great in my acekard but eventually i bought another for my phone after selling my 2 gb. This was a san disk 4gb class 2 also but i lagged in every game when i tried using it in my acekard. At first i thought my acekard was dying but i switched back to my first card and it worked great. I exchanged it to best buy and made the mistake of getting the same thing, this time i bench marked it. It got a read speed of slower than 10 mb/s ( i think it was 6, i know it was lower than 7). Now ive heard random access is what matters but when i tested my good card it got a worse random access rating (latency was slightly higher). But the sequential rating was so much higher on my good card it wasn't even in the same ballpark. So this gave me the impression that sequential is what matters. I dont care what anyone else says because this later becomes very obvious why these cards differ and how they differ. Then i bought some knock off brand durcell for my gf. Its a class 4 but performs as good as my first sd and benchmarks the same in sequential read. So very recently, I purchased a gigaware micro sd that just gave me the feeling it was somehow a re-branded san disk by the packaging and card itself, and without me saying a word the clerk told me it was after I made this assumption. I benchmarked it and tested it in game and low and behold it performed like shit and benchmarked like shit (again below 7 mb/s). So at first I couldnt figure it out. 4 san disks and only 1 good one? Whats wrong here. Then i remembered something everyone says japense kingston is good. Why japense i thought. Then i checked my cards. All the shitty san disks were made on china! And the good one? Taiwan? And the cheap knock off that worked well? Taiwan again! So this got me thinking. I took a hit for the sake of curosity and did an experiment. I bought a bunch of different brands and class speeds but these were all sdhc cards (4gb or higher). And my theory holds. Every china one performed worse than my taiwan ones. Now its difficult to get your hands on japense made cards in retail where i live but i did get 1 and you guessed it peformed the best out of the three. I will post the full details if anyones interested but believe me brand and class dont seem to make a difference when it comes to read speed.