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Memory Card Comparison - CFExpress and XQD

ericbowles ericbowles

Is from: Atlanta, US
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ericbowles Moderator Awarded for his in-depth knowledge and high level skills in various areas, especially Landsc... Writer Ribbon awarded for for his article contributions to the community Donor Ribbon awarded for his very generous support to the Fundraising Campaign 2015 Ribbon awarded as a member who has gone beyond technical knowledge to show mastery of the art a Nikonian since 25th Nov 2005
Tue 23-Feb-21 02:56 PM | edited Thu 25-Feb-21 05:36 PM by ericbowles
I've seen a couple of articles recently comparing different CFExpress memory cards in the latest cameras. Here is my version.

Methodology
I used a Nikon Z7II with three cards - Delkin Power CFExpress 128GB, Prograde Gold CFExpress 128GB, and Lexar XQD 64GB. The test included both 14 bit and 12 bit NEF files with Lossless Compression.
Camera settings were Electronic Shutter, AF-C Single, and other settings to reduce processor impact.
Counts are based on counting the number of images recorded in each whole second as reported in the file EXIF data. That data was entered into an Excel spreadsheet. Yes - I counted nearly 1000 frames just for this report.

The intent was to simulate the way I photograph.

What you can see is an edge to the high performance card - the Delkin Power 128GB over the other two card. The first 4-6 seconds ran at the peak frame rate until the buffer was filled, and then the camera slowed significantly. With the ProGrade Gold - a lower level card - not only did you see the buffer filled faster, but the write speed and shooting rate were more compromised. I don't know whether this is due to differences in thermal management by the card, the camera, or a combination. I was surprised to see the relatively good performance with the XQD card.

The vertical axis shows the number of frames shot in each full second.
The horizontal axis shows each full second time interval in the order shot.

Click on image to view larger version

Click on image to view larger version


Attachment#1 (jpg file)
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Eric Bowles
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