CompactFlash Association Announces CFexpress® 4.0 Logical and Physical Specifications

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LOS GATOS, California – CompactFlash Association (CFA), the organization responsible for professional removable media specifications such as CompactFlash®, CFAST®, XQD®, and CFexpress® announces the release of the CFexpress 4.0 logical and physical specifications increasing the performance of the existing CFexpress 2.0 specifications while maintaining backward compatibility targeting the professional imaging and industrial markets requiring high-performance

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Current CFexpress v2.0 cards (the best ones at least) can throw 10 r5 full RAW frames per second onto the card even after the buffer is full. That's not a spec sheet figure, but actual performance of the best of the cards.

This new standard appears to double the throughput, so you'd likely get the full 20fps onto the card without even needing a buffer.

I assume that camera makers will have to make changes to hardware and software to support the new card type, so don't get too excited. The 3.0 standard didn't exactly catch fire, so it'll be interesting to see if Canon opts to adopt.

One interesting note: the Type A cards that Sony uses had significant throughput limits versus the Type B cards, but with the performance able to double, they'd be on par with today's Type B cards.
 
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Current CFexpress v2.0 cards (the best ones at least) can throw 10 r5 full RAW frames per second onto the card even after the buffer is full. That's not a spec sheet figure, but actual performance of the best of the cards.

This new standard appears to double the throughput, so you'd likely get the full 20fps onto the card without even needing a buffer.

I assume that camera makers will have to make changes to hardware and software to support the new card type, so don't get too excited. The 3.0 standard didn't exactly catch fire, so it'll be interesting to see if Canon opts to adopt.

One interesting note: the Type A cards that Sony uses had significant throughput limits versus the Type B cards, but with the performance able to double, they'd be on par with today's Type B cards.
Which cards have you used with this capability?
 
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Current CFexpress v2.0 cards (the best ones at least) can throw 10 r5 full RAW frames per second onto the card even after the buffer is full. That's not a spec sheet figure, but actual performance of the best of the cards.[…]
That’s about 400mbyte/s, so the bottleneck is the R5, not the card.
The Nikon Z8/9 do seem to be able to get the full speed, so using those for testing would give a better impression of the cards performance.
For the R5 that’s a moot point, but for future CFe bodies it would be useful info.
 
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