Good wine cheap / fast / but not as fast hoped that

This card would be "HighSpeed" with 50 MB / s write and up to 80MB / s read ... or it's a 32 to 36 MB / s max write that I received!
So beware, if you need big performances ... maybe consider buying another card !!
Otherwise, it works very well (but not 50 MB / s) ... to do over time.
In play, nothing wrong with it is against between 80 and 90 MB / s.

(Read the details of my following tests if you are interested ... I thought it might be useful for some picky people like me and looking for good products)

Personally, I was looking for a card with absolutely 50MB / s minimum.
I studied the market and I ordered several brands and card designs.
It was at + competitive power / price (0.30 euros per Giga 0.006 per MB / s ... for a 50MB / s).

But in fact, when I tested the card, I realized that this is NOT a 50 but a 32 to 36 MB / s ... so, for many people, this will have no 'importances ... but for some uses (video HD high flow / 4K / Photo Burst / data transfers ...) this can be important.

Above all, the major +: I bought this card for the technical specifications / performance that were indicated on the website (in the title) and in detail by the seller, "write: 50MB / s read, 80MB / s (USB 3.0 test card reader) * Speed ​​may vary according to different computers and card reader. "

I performed tests on two different computers. With 3 different players and with 2 different software.
The results seem to be ... Reliable and seller confirmed after himself tested his cards that the 50 MB / s performance was not the RDV (one can appreciate their honesty on this one remains ... to see if they change the title of the item for sale :))

Besides, when ordering, I had seen that the performance indicated for 32GB cards were 40MB / s to 50MB / s for the 64GB ... but I thought that c 'was the type or the amount of chips / integrated memory and they should know what they say on the website (and some buyers in comments also confirmed the speeds, which had reassured me).

After my tests I immediately (the day of reception of the package) warned the seller. We exchanged several emails over several days (in French). He always answered between 2 am and 10 am (Paris time) ... so I think that they are based in Asia :)
They were very correct and offered me either to return them the product and pay me in full, or to make me a gesture of goodwill, and they would "solve the pb" ("false 50MB / s" become 32-36 MB / s)

Otherwise, for info:
- 2 Amazon sellers (and Sunwood Sky_Bear) are one and the same company ... I wrote to two when I saw the performance of the card I received, they said at the same time they had actually performed the test following my message and they confirmed the bp) ... and they told me they are the same company (2 people responding to emails being "colleagues" and communicating with each other ... I imagine they are in the same premises)
- They told me to be brand owners "filed in EU meadows and registered under national number: 011339785 NO"

Finally, in order to get the performance I needed, I ordered another brand / model I recommend: Integral INSDX64G10-95 / 60U1 ... there is a UHS-I card but U3 ( not to be confused with UHS-II, the UHS-I U1 and U3 compatible ... UHS-II require specific hardware to take advantage of performance) ... While this card costs 50% more expensive but performance in writing are 64MB / s write ... or DOUBLE the Qumox I got ... 50% of the price for 2x perfs ... warranted for my use :) up to you to yours :)