ProGrade Digital 165GB Cobalt CFExpress Type B Card Review



Two characteristics that became very important with the introduction of CFexpress as a mainstream storage medium were temperature and sustained write speeds.  We measure temperature by monitoring and updating a  Crystal DiskInfo Benchmark while a large 85GB 8K file transfer is being performed.  This is the extreme of what one might see in this environment.

An important aspect to remember is that the temperature results we obtain are the extreme.  They are the hottest the card got during any period of our testing which was constantly monitored.  It does not speak to the median or typical temperatures one might expect which would be around the low 30°C mark.  Having said that, the results we obtained from the ProGrade Digital Cobalt 165GB CFExpress Type B card were amongst the lowest we have seen to date which is very impressive.


We determine sustained write performance by transferring a 85GB 8K media folder from the PC to the CFexpress Type B card.  This test is vital to those looking at digital storage for high end 4K and 8K video recording.

Although we hope to see a very smooth and steady sustained write speed during data transfer, the sustained write speed of 145MB/s for the Cobalt 165 is very impressive and chart topping.


For our Real World File Transfer Comparison of the world’s top CFexpress Type B cards, we have included all cards that we have received to date. This test is conducted through the transfer of data from one spot on the test drive to another to give us the truest of transfer speed results for that device.

The Data Transfer speed of the ProGrade Digital Cobalt 165 is as much as would be expected from the ProGrade Cobalt line; this is a top performing storage medium.

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