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TEMPS, SUSTAINED WRITES AND TRUE DATA TESTING
TEMPERATURES
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.
Lexar has dropped its maximum temperature significantly since its earlier release of the 128GB capacity of this same card a few months back. This is especially appealing when you consider that the Lexar professional Diamond has the fastest sustained write transfer speed on the market right now.
SUSTAINED WRITE PERFORMANCE
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 1.57GB/s is the best we have seen to date and just below listed specifications of 1.6GB/s.
REAL WORLD FILE TRANSFER COMPARISON
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 Lexar Professional Diamond Series CFExpress Type B Memory Cards are the best we have seen to date and consistent with what we are seeing throughout our overall test regimen.
REPORT ANALYSIS AND FINAL THOUGHTS
It just so happens that we came across an advert for a CFExpress Type B to M.2 adapter while doing this report, and I thought to myself just how inconvenient adding such really is. It is a massive add on to the exterior of any camera. And then there are also now CFExpress Type B adapters where one can add in a 2230 M.2 SSD where that inconvenience of an external add on has been tackled, but just how cool would such be in comparison? There is a common thread to both and that is price. Both are trying to achieve higher capcity at the same top speeds for a lower price which is a bit of an issue in this storage space right now. CFExpress type B Card pricing is, at its best, unrealistic considering what we can find from other flash storage mediums.
The Lexar Professional Diamond CFExpress Type B Cards is one of the best on the block considering its performance of 1900MB/s read and 1700MB/s write with guaranteed 1600MB/s sustained writes. There is simply no question of that. Its lifetime warranty is unparalleled by any other which is a massive step forward by Lexar with respect to confidence in its own product. With an MSRP of $529, however, we are sitting at over $1/GB which is so out of whack compared to even the top SSDs which are Gen 4 vice Gen 3 and you are getting a upper tier 2TB SSD for under $200 now. It is time to get pricing of CFExpress down just a bit we think. Still… very deserving of our gold seal.
CHECK LEXAR PRO DIAMOND PRICING AT AMAZON
