Why no thread on sd card speeds?

[johnspack]

This was really confusing to me. I needed a 4k capable card, which turned out to be a u3, or v30 sdxc type. Do you all know what is required for 1080, 2k, and 4k video recording?
I settled on the Samsung Evo Plus 64gb. It's a a UHS-1 level 3 Class 10 card. It gives me 37MB/s write. It passes. I'm going to run a series of benches under android to really
test. I'd like to see other results from other owners of different phones. I have the Samsung Galaxy S7, US edition with the snapdragon 820. Anyone please post results from
Androbench ect....

 

[Athlonite]

Perhaps because like a lot of so called speed level advertising is just that advertising because it only happens in the lab never actually in real life

here's the chart with what you should get so lets see what you actually get

 

[johnspack]

Now let's see actual results from users and reporting which drives they are using?

I'll post my results tomorrow, but I get like 37 MB/s write and 77 read on my phone with my evo plus. I know pcs get much higher. Just would like to see some real world results such as from Andbench...

Also that list is useless. You need to look for U. U with a 1 in it is only 10mb/s write min. U with a 3 in it is 30mb/s and is required for decent 4k recording.
You also can use the V6,10,30,60,90 rating.
https://www.sdcard.org/developers/overview/speed_class/

 

[flmatter]

I use sandisk extreme plus or pro cards. seq read 394.66 mb/s write 33.64 mb/s , random read 47.77 write 8.86 on a S7 Edge posted results with extreme plus 64gb micro card

 

[Ferrum Master]

I am totally for this kind of thread. Lets benchmark sd cards.

What tool? Using RDF-5?

 

[TheLostSwede]

I use sandisk extreme plus or pro cards. seq read 394.66 mb/s write 33.64 mb/s , random read 47.77 write 8.86 on a S7 Edge posted results with extreme plus 64gb micro card

That's a cached read, means nothing. There are no UHS-I cards that are that fast and no phones that I'm aware of support UHS-II cards.

This is also a futile endeavour, as every device you test with, will give you a different performance figure, so the numbers you get are only valid for that device.
It's also worth noting that most phones seem to have quite slow SD controllers, as I have yet to see a high-end card that comes anywhere close to the kind of claimed speeds that the manufacturers are selling these cards as.

 

[Ferrum Master]

most phones seem to have quite slow SD controllers

They don't have them at all, native mode from the CPU itself via SPI.

Here are mine currently at hand. Did the test using plain Transcend RDF5 reader.

First is the EVO+ crap. Second is the best and most trusted thing... the Extreme PRO, and only the PRO does deliver proper write speeds.

 

[TheLostSwede]

I take it you're aware that the SD card speed standards, with the exception of the new V(ideo) standard, are for read speeds only?
Which is also why so many SD cards perform fairly poorly, even though they're sold as high-speed options.

 

[Ferrum Master]

I take it you're aware that the SD card speed standards, with the exception of the new V(ideo) standard, are for read speeds only?
Which is also why so many SD cards perform fairly poorly, even though they're sold as high-speed options.

There's even more... I've bought the same cards few times and they differ a lot even between batches... especially Samsung cards... the latter ones are usually slower...

Also i lol about the fact that the older EVO had faster writes and the EVO+ are a bit slower. I have Samsung PRO and and some Lexar Card at home... will post their speeds too tomorrow. Just for the sake of having data online about them. Crystal mark using a reader is pretty what you get.

I have experimented with them a lot because of raspberryPI actually... also naturally for my Sony Alpha camera... Doing burst shots (flying planes or cars) then the wait time from camera RAM/internal NAND write to the SD card really matters. 4K video ain't that though task actually versus burst RAW shots.

 

[TheLostSwede]

A few random benchmarks of various cards I have

The last two are before and after a firmware update of my Kingston card reader, which made quite a bit of a difference when it came to random tests.
I still get nowhere close to the rated speeds of the SanDisk Extreme Pro card though...

 

[Ferrum Master]

For science I have the Lexar LRWM05U-7000 reader at hand too. UHS-II capable. The UHS-II card is at home thou.

The same Sandisk Extreme PRO 32GB card. The smaller file writes are very tied to CPU single core performance. I am at work and still sport a veteran Phenom X4 955 CPU lol. It simply doesn't die yet.

Well there is a bit difference tho...

 

[Ruru]

Old Sandisk Ultra 8GB class 4 from the era when dinosaurs still roamed on Earth.. however, it does it job as an OS installation media.

 

[jboydgolfer]

the whole rating system for the SD/microSD market i (IMO) a joke. Ive paid top dollar for what were rated highest in all classes (also, why are there 3 Damn ratings?!?!) and the thing was a dog, it was very slow, and barely faster than my generic SD cards that come with devices for free.

 

[Gasaraki]

SDCard speeds change so much within the same named model. Some are fake, some the manufacturer changed the specs without telling you, etc.

 

[TheLostSwede]

the whole rating system for the SD/microSD market i (IMO) a joke. Ive paid top dollar for what were rated highest in all classes (also, why are there 3 Damn ratings?!?!) and the thing was a dog, it was very slow, and barely faster than my generic SD cards that come with devices for free.

Three ratings? More like six, depending on how you count.
You have SD/HC/XC (UHS-I)/XC II (UHS-II)/XC III (UHS-III) and SD XC Express for the bus speed.

You have the old X rating (i.e. 133x) which some companies still use.
We have the "old" Speed Class (2, 4, 6, 10).
Then we have UHS speed class (U1/U3) not to be confused with the bus speed options.
Then we have the "new" Video speed class, V6, V10, V30, V60 and V90.
And finally the brand new Application performance class, A1 and A2, where A2 cards seem to require new software to take advantage of the random performance improvements. My A2 card gets nowhere near the kind of numbers that the standard is supposed to deliver for example.

It doesn't help that most devices are limited to XC/UHS-I bus speeds, as UHS-II require a different card interface, which isn't widely used outside of higher-end cameras.
Can't say I've seen any UHS-III devices of any kind.
And SD XC Express isn't yet ready...

Let's see how many more logos they can add until they run out of space on the cards...

 

[johnspack]

Wow, well I found out my Samsung Galaxy S7 can't really max out more than 40MB/s min and 80MB/s max no matter what card is used. The Evo + was still almost 4x faster than the previous card I tested.
Still worth it to get a faster at least U3 level card.