Would be nice if there was a reliable method to verify the card supports it
Not just the card, but if the circuit board has good design,
low capacitance in the D[0-3] lines, and the max mA drive for them
That is why 1v8 runs faster, less capacitance at lower voltage
Anyway, the iozone test will tell you how crappy the card is reading/writing 4K & 16K blocks
It’s not a camera with single threaded large files