Lexar microSDHC UHS-I 633x 16GB Card Review

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Lexar 16GB MicroSD 633x USB 3.0 Performance


CrystalDiskMark 3.0.3 x64:

CrystalDiskMark is a small benchmark utility for drives and enables rapid measurement of sequential and random read/write speeds. Note that CDM only supports Native Command Queuing (NCQ) with a queue depth of 32 (as noted) for the last listed benchmark score.


Benchmark Results: CrystalDiskMark showed that we hitting 93.71MB/s read and 25.02MB/s write on the sequential tests! Lexar rates this drive as having up to 95MB/s speeds, so we are able to get pretty close to those ratings with this particular benchmark.

ATTO v2.47:

ATTO is one of the oldest drive benchmarks still being used today and is still very relevant. ATTO measures transfers across a specific volume length. It measures raw transfer rates for both reads and writes and places the data into graphs that can be very easily interpreted. The test was run with the default runs of 0.5kb through 8192kb transfer sizes with the total length being 256mb.


Benchmark Results: ATTO showed the Lexar 16GB microSDHC 633x card was able to reach 94MB/s read and 25MB/ write speeds with the default benchmark settings. We are very close to the rated speeds, but we really wish we could have hit that magical 95MB/s mark in the benchmarks on our test platform.

Real World File Transfer Tests

TeraCopy 2.3 is a compact program designed to copy and move files at the maximum possible speed and features a timer that works great for review purposes as we can easily show you time differences between different file transfer scenarios. TeraCopy also uses dynamically adjusted buffers to reduce seek times and has asynchronous copy speeds up file transfer between two physical hard drives.

We recently moved over 4.18GB of pictures and movies that we shot on our Canon 70D SLR camera during CES 2014 to our ASUS UX31A Zenbook that runs Windows 8.1. We wanted to see how long it would take to move that folder to the Lexar microSDHC card and then back to the Ultrabook. There are 305 files in this folder and include just pictures and movies. This is a very real usage scenario, so we can’t wait to see how the drive performs!


Moving the ~4.2GB folder from our desktop to the Lexar High-Performance microSDHC UHS-I card (633x) took 3 minutes and 13 seconds and it looks like we averaged 22MB/s during the data transfer. We were seeing write speeds of 25MB/s in the synthetic benchmarks, so this is a pretty good result.


We then moved the folder from the Lexar High-Performance microSDHC UHS-I card (633x) back to the desktop the task completed in 1 minutes and 28 seconds! The read speeds for this averaged 49MB/s. This is a little lower than expected, but a respectable speed nonetheless.

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  • nickola anderson

    Sony memory card is quite exceptional as it classified in the class 4 category which is quite good. Its 16 GB space capacity gives you the full independency to store enormous amount of data. It is compatible with all other devices.


  • Benjamin Sohr

    Sorry, but your testresults are absolutly false! I dont know what you`ve done, but my card is twice that fast than yours.

    • Nathan Kirsch

      You do know there is a write performance difference between the 16GB card and the 32GB card that you have correct? My result isn’t false, you are just seeing different results due to the density on your higher capacity card and how many lanes are available to the NAND to connect to the controller.

      • Benjamin Sohr

        Okay, I dont expected a difference like that. What I want to say is, that the lexar is one of the fastest cards on the market at the moment 04/2014 and it works absolutly great in my gopro in contrast to a sandisk card. Greetings Benny

        • Nathan Kirsch

          Benjamin, I asked Lexar for the official speed numbers and I have attached it. The 16GB card is 95MB/s read and 25MB/s write. The 32GB/64GB cards are 95MB/s read and 47MB/s write. The reason is due to what I mentioned above. Your card write speeds are spot on as are mine! Hope you better understand what is going on.

  • basroil

    Why recommend horribly bad memory cards? The Sandisk Extreme Pro costs less ($90 for 64gb) and has nearly double the write speed (which matters more than read for memory cards). Hell, even Samsung has a 60-30 card for $60 that could be considered better value!

    • Nathan Kirsch

      I took a quick look at the Sandisk Extreme Pro microSDHC 16GB card (SDSDQXP-016G) and saw it cost more $39.99 and had the same 95MB/s rating. Now digging into the specifications it looks like the write is indeed at 90MB/s as well. That does indeed change things. Thanks for bringing that to my attention.

      • basroil

        Oops, it’s “Extreme Plus” for 64gb version, with 80/50 rating (though predicessor had 95/60 tested even with the same rating). 4k writes are also double at ~2mb/s, so it should be able to easily best the Lexar (and includes rescue pro, which is a photographer’s best friend, especially when cops are involved)

        • Gorpoeerrr

          Note Gopros black 3+ don’t like Sandisk cards and reject them regardless of their write speed – many articles on www about it

        • reo

          My Gopro h3+ black loves my sandisk extreme 64gb in all modes, including protune. Earlier issues were with the Ultra cards.