SanDisk Extreme UHS-I microSDXC Card SDSDQX Review


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AS-SSD Benchmark Results

Alex Schepeljanski of Alex Intelligent Software develops the free AS SSD Benchmark utility for testing storage devices. The AS SSD Benchmark tests sequential read and write speeds, input/output operational performance, and response times.

Beginning with sequential transfer performance, the 64GB SanDisk Extreme microSDXC memory card produced read speeds up to 88.40 MB/s and 56.64 MB/s writes. Response (access) time measured 0.710 ms for read requests, and 1.175 ms for write requests – both results are quicker than most SSDs can produce. Results are illustrated below:

as-ssd-bench 64GB SanDisk Extreme UHS-1 microSDXC Card SDSDQXAS SSD Benchmark Results: SanDisk SDSDQX-064G

Next up was the 32GB Transend TS32GUSDU1E microSDHC card, which produced a near-identical 88.12 MB/s read speed. Write performance is where the two products go their separate ways, with the Transcend card measuring only 17.67 MB/s writes. Response time revealed why: 0.827 read access, but a lengthy 8.839 ms wait for write transactions. Test results shown below:

as-ssd-bench 32GB Transcend MicroSD Card HC-I Class10 UHS-1

AS SSD Benchmark Results: Transcend TS32GUSDU1E

In the next section, Benchmark Reviews tests transfer rates using ATTO Disk Benchmark.

TEST SUMMARY: The SandDisk Extreme microSDXC memory card series completed write transactions 320% faster than the Transcend counterpart, and responded far quicker with a 1.175 ms access time compared to 8.839 ms for the Transcend memory card labeled with the same certifications.


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