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Showing 1 of 20 conversations about:
Quarnozian
51
Dec 11, 2018
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I came here to make fun of the marketing team for putting "Gaming" on this...
Then I noticed the price is cheaper than what I paid for my U3 256 card... but then I noticed the SPECS
These are U1 cards, but the images are of a U3 device.
----- edit----
apparently UHS-I refers to the "bus speed"... This is a U3 device.
The people that came up with the naming standards just didn't realize U1 and UHS-I are easily confused.
(Edited)
Quarnozian
51
Dec 11, 2018
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QuarnozianLooked up the MicroSD speed standards... a V30 device has the same speed requirements as a U3 device.
It can't be U1 and V30... so the specs listed are wrong.
https://www.sdcard.org/developers/overview/speed_class/index.html
Hawkeye.Twolf
2
Dec 11, 2018
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QuarnozianThe SD card specs are confusing. I don't believe that "UHS Speed Classes" (U1/U3) are exactly the same thing as the "UHS Bus IF product family" (UHS-I/-II/-III).
> The UHS Speed Classes defined by the SD Association are UHS Speed Class 1 (U1) and UHS Speed Class 3 (U3). U1 and U3 can be applied to UHS Bus IF product family (UHS-I, UHS-II & UHS-III).
I don't understand the difference, but I know that I bought a 128gb PNY microSD card from Wal-Mart the other day and its specs are also listed as U3/UHS-1.
Quarnozian
51
Dec 13, 2018
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Hawkeye.TwolfWow, they really didn't think that through when they came up with their naming conventions.
techwiz
235
Dec 13, 2018
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QuarnozianSoftware engineer here, the bus refers to the host/slot side and is the maximum possible throughput available. I'm pretty sure they're all electrically compatible, so it basically acts like an upper speed limit. Speed class is card side and is a guarantee for minimum specs, i.e. we guarantee it will be at least this fast.
So in a nutshell, Bus speed is speed limit, speed class is guaranteed performance. You can think of it like the bus is a highway and the cars on it all have classes like economy (slow), luxury (average) and performance (fast). Alternatively, you can think of bus like PCI-e standards (2.0 and 3.0) and speed class is how many lanes your GPU uses, like x8 and x16.
It's confusing because no one in this field knows how to name stuff and we love acronyms. Sorry.
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