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PUTTING THE LEXAR 800x CF CARD TO THE TEST
For our testing today, we will be using a variety of free flash media transfer speed testing software; the reason for this being that anyone can simply download and duplicate our tests exactly. Simply click on the title link of each program for the free download. For our comparison testing, our newest Canon EOS 5D Mark IV will be used and we will do a direct comparison of both SD and CF cards in this camera.
ATTO Disk Benchmark is perhaps one of the oldest benchmarks going and is definitely the main staple for manufacturer performance specifications. ATTO uses RAW or compressible data and, for our benchmarks, we use a set length of 256mb and test both the read and write performance of various transfer sizes ranging from 0.5 to 8192kb. Manufacturers prefer this method of testing as it deals with raw (compressible) data rather than random (includes incompressible data) which, although more realistic, results in lower performance results.
Considering the Lexar 800x 512GB CF Card is rated at 120MB/s read and 75MB/s write, these results do it very well, especially where the read speeds more than double in performance, attaining the UDMA7 classification as we had hoped.
CRYSTAL DISK BENCHMARK VER. 5.1.2 X64
Crystal Disk Benchmark is used to measure read and write performance through sampling of random data which is, for the most part, incompressible. Performance is virtually identical, regardless of data sample so we have included only that using random data samples.
One always expects performance to drop when switching from compressible data samples to incompressible, but as we can see with Crystal DiskMark testing, performance is still solid and very close to ATTO.
The toughest benchmark available for solid state drives is AS SSD as it relies solely on incompressible data samples when testing performance. For the most part, AS SSD tests can be considered the ‘worst case scenario’ in obtaining data transfer speeds and many enthusiasts like AS SSD for their needs.
AS SSD once again validates the strength we are seeing in the Lexar 800x CF Card. For this test, we elected to only test in sequential mode as the full test is very time-consuming in AS SSD.