Help me determine if my Lexar card is authentic and running at it's proper speed

I

Imamacuser

Veteran
I just bought a Lexar 2000x 64GB SDXC card on eBay for $60. I know you should never buy memory cards on eBay, but I just couldn't resist. The seller said that it's an authentic Lexar card but wasn't including packaging to keep the shipping cost down; however, he did say that he'd give me a refund if it wasn't a genuine Lexar. The SD card shipped from Florida, and appears to be the full 64GB capacity, and it seems fast.

I rans speeds tests in AJA System Test Lite with a Kingston G4 USB 3.0 card reader on a mid 2012 MacBook Pro. Do the follow speeds seem about right for the card. Lexar claims 300MB/s read, 260MB/s write, but that's probably manipulated marketing specs.

UHD resolution test:

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HD resolution test:

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