Grade 3 Class 10 microSD's worth it?
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paxsali
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PostPosted: Fri, 18th Nov 2016 04:46    Post subject: Grade 3 Class 10 microSD's worth it?
Is it worth spending a few extra bucks on a 93 Mb/s read, 88 Mb/s write microSD such as the Samsung PRO+ series?

I mean, it says it's compatible with Phones, Tablets and Cameras etc. but !!!!!! ...,

.... will every smartphone or raspberry pi or tablet support those speeds, as long as they got a microSD card slot?

OR

Are there also differences for the microSD slots bandwidths?

Similar to the situation on PC where you COULD use a SATA3 SSD on a SATA2 motherboard, but then you don't get the whole bandwidth / potential speed.

Or is the microSD card itself the only speed relevant factor and the microSD Slots are pretty much all the same?

I just wanna make sure I don't over-spend on extra-expesive microSD cards for my Tablets and my Raspberry Pies.

Anyone knows about this stuff?


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paxsali
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Posts: 18352

PostPosted: Fri, 18th Nov 2016 04:53    Post subject:
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Last edited by paxsali on Thu, 4th Jul 2024 21:20; edited 1 time in total
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paxsali
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Posts: 18352

PostPosted: Fri, 18th Nov 2016 05:02    Post subject:
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Last edited by paxsali on Thu, 4th Jul 2024 21:20; edited 1 time in total
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Guy_Incognito




Posts: 3436

PostPosted: Fri, 18th Nov 2016 09:40    Post subject:
The speed highly depends on the SD controller in SoC, so you should check the Broadcom datasheet for its maximum capability. Hopefully Pi design uses all four data lines on SD bus, and not only one, and supports DDR transfers. Also, SD controller initializes the communication at some low clock, and then negotiates the final speed with the controller in SD card by typically doubling the previous clock and checking the response. So theoretically, it may finalize the initialization at lower speed, if they don't like each other for whatever reason.

TL;DR Don't buy anything before checking benchmarks
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