I believe Delkin Devices is a brand that I found while doing a search for microSD card brands. If I remember correctly, I came across a survey where someone was asking what the most reliable microSD card was, and they had this listed as an option.
These cards meet all the criteria that I set out for determining what is considered a name-brand card — so I’ll lump them into the name-brand cards bucket.
These cards bear the U3 and V30 marks — and performance measurements were good enough to qualify for these marks. In my initial performance tests — which were done using a JJC CR-UTC4AC USB card reader — sequential read speeds were pretty well below average. However, when I re-tested them on a Raspberry Pi 5 later on, sequential read speeds were closer to average. Coincidentally, these cards share the same manufacturer ID, OEM ID, product name, and product revision with the PNY Premier-X 128GB — and while performance metrics were similar between the two, the Premier-X didn’t have the same issue with sequential read speeds when tested on the JJC CR-UTC4AC.
All three samples are currently going through endurance testing:
- Sample #1 has survived 15,158 read/write cycles so far and has not yet experienced any errors.
- Sample #2 has survived 12,703 read/write cycles so far and has not yet experienced any errors.
- Sample #3 has survived 12,681 read/write cycles so far and has not yet experienced any errors.
May 14, 2026