I found something interested issue, it is about two different version of Lexar SDXC 64GB 300x where it made from. My cards are two different nations : Taiwan and Korea. And I could suppose one of those must be belong to Barun Electronics of South Korea.
So I had check what different is benchmark, first is from Taiwan.
Reading speed in sequence, about 45~46MB/sec in USB 3.0 (UHS-1) card reader. And Writing speed recorded as 24~26MB/sec. Important in using Android device may 4K writing speed, and it recorded around 1MB/sec.
And next is from Korea.
Reading is definitely better than Taiwan, but real performance is not belong to speed of reading. Check writing speed, and really important is maybe 4K, as see, it recorded under 1MB/sec, really poor.
If you can choose what it from, I strongly recommends choose Taiwan. Don’t waste your valuable memories by accident at once by happening sudden death of sdcard of Barun Electronics. It really sucks, I had wasted totally 3 64GB cards even it printed MLC on surface.