Testing Samsung 64GB EVO MICRO SD XC MEMORY CARD CLASS 10 UHS-I 64 GB

[csabagb]

Hi,

I recently started to learn more about testing storages and understanding different file systems.
During testing drives, I found that I have different results on certain products than other expert websites' results. In particular I would like to understand in the case Samsung 64GB EVO MICRO SD XC MEMORY CARD CLASS 10 UHS-I 64 GB.
I have mixed results compare to Manufacture and other expert websites' findings.


So compare to Ourberries.com, My results are quite similar on CrystalDiskMark 3 (4000Mb), however on H2testw i have way lower ones.

Link: http://ourberries.com/2014/10/27/reviewed-samsung-evo-microsd-64gb/

Also, If I compare my test results by ATTO Disk Benchmark & H2Testw, Again the same micro sd has way lower results than the one claimed by a seller on Amazon.

Link: http://www.amazon.co.uk/gp/product/B00N0RX6W4/ref=cfb_at_prodpg

My Findings:

Link: https://www.dropbox.com/s/cht8xb7j9e81vna/gnm%2C.jpg?dl=0


My Questions are:

Why have I a similar score by CrystalDiskMark, but very different by H2testw and ATTO?
Do the results of H2testw means the micro sd is a faulty version?
Why is that if I run more times H2tesw on the same sd card the results are bit different? (second time scored higher)


Connection USB 3.0 and built in memory card reade.

Thank You for your help in advance.

Computer Used for the Test:
DELL 15 7537
4th Generation Intel® Core™ i7-4510U processor (4M Cache, up to 3.1 GHz)
16GB 2 DIMM (2x8GB) DDR3L 1600Mhz
1TB 5400 rpm SATA Hybrid Hard Drive with 8GB Cache
NVIDIA® GeForce® GT 750M 2GB DDR5
Windows 8.1 (64Bit) English
USB 3.0 conncetion

Multi-media Card Reader
Digital (SD) Memory Card
Secure Digital High Capacity (SDHC)
Secure Digital Extended Capacity (SDXC) with UHS 50MB/Sec
Memory Stick (MS)
Memory Stick PRO (MS Pro)
Memory Stick XC (MSXC)
Multi Media Card (MMC) - Multi Media Card plus (MMC+) supported in MMC compatibility mode only xD

 

[ShadyHamster]

There are so many reasons as to why the results are different.
Is you rig the same as what was used in the other tests?
Do you have the same OS and software installed?
Do both test rigs have the same USB controller and drivers installed?
And the list goes on.

The results, even on the same rig, are always going to be different, there are lots of factors that can effect that too.

 

[csabagb]

Hi sorry I updated the post with the connection types. Unfortunately, I do not have the information of the other testers OS. Software is same, and rigs were same as well. So, What method could you use to ensure yourself the product is up to the claim of the manufacturer?

 

[ShadyHamster]

There isn't really any method for that apart from copying the rig and the test environment.

Different nand flash can also effect the speed, just because one card reaches a certain speed doesn't mean another one will.
As long as the card meets the minimum requirements for the class it's rated at there isn't to much you can do about it, higher speeds are just a bonus.

 

[OurBerries]

Hi csabagb,

I am the author from OurBerries and i see your concern.

I am, as noted, using Asus ZenBook running i7-4500 and a Samsung Evo 840 SSD.
I am also using Windows 8.1 (64Bit) English.

My specifications can be noted here:
http://ourberries.com/2014/09/16/microsd-round-reviews-giveaways/

I am not too sure what connections that you are using, however, I am using a UHS-I certified microSD card reader: Transcend RDF8.

The quality of the connector will affect the speed as well.

Also, h2TESTW tests every single cell storage whereas crystaldiskmark tests a fixed sample.

My test results used 1 x 50mb, 5 x 1000mb and 1 x 4000mb.

Not only the hardware, other softwares running in the background during the system test may also contribute the the reduction in speed (ie, anti-virus).

By no means, however is it faulty since Samsung says it is "UP TO 48MB/s". As long as it is above 10, and less than 48, it is in theory, within their claim.

Feel free to hit "contact us" to discuss our tests?