Could be counterfeit products.
Word is they are Lexar cards that failed quality control for a variety of reasons. So it's bound to be hit and miss....
I just ordered two more and will compare when they arrive next week.
---
Update, two new 1000x Komputer Bay cards have arrived, and I'm afraid they benchmarked even worse than the first two, never getting write speeds above the 50's, though the company claims write speeds of 140 minimum.
I will be returning them. Thank goodness Amazon makes it easy.
