I purchased CF Express cards for the coming R5, and they arrived over the past few days. Three different types. I did the Black Magic Disk Speed Test to each and thought people might appreciate the results. This test does repeated read/writes to the card to simulate real world video file use.
Sony Tough CF Express G (512GB)
Read: 1050 MB/sec
Write: 1050 MB/sec
ProGrade (Gold Bar, apparently first generation, 256GB)
Read: 1250 MB/sec
Write: 950 MB/sec
The tests were performed about 10 times each. Card reader was a Sonnet reader with Thunderbolt 3.
The Sony card was abysmal, as it was the most expensive and claimed to be the fastest (1700/1480). The Delkin claimed 1730/1430 and wound up being the actual fastest by about 10 percent. The ProGrade with gold stripe is supposed to be 1600/1000. I have a ProGrade with black stripe (claimed 1600/1400) coming in and will add those results when it's tested.
For now, I'm giving this anecdotal crown to Delkin, which I know will drive certain forum members up the wall.
-tig
I got the ProGrade Onyx version in. The increased performance over the Gen 1 version of the ProGrade gold version was a bit disappointing...
That's a nice improvement on the read speed, but the all-important write speed was only 7 percent faster. The claimed speeds are 1600/1400, so the write speed is definitely suffering versus the claim.
The upshot is that the Delkin is - by far - the best performer, and the best $/GB. I'd love to try the Lexar and Sandisk versions just to be complete, but can't justify buying more cards. If someone else has those, I can show them how to conduct this test.
One interesting note. After doing so much burn-in testing of these cards, I'm noticing that they get very, very hot. Unlike CF cards or SD cards. There's just a ton of heat generated from this format it seems. This may have implications for the R5 heat limitations, and might be good news. It may mean that using an external recording could, indeed, matter in terms of the amount of time before you hit a heat limit.
Jul 16, 2020 at 03:12 PM
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