Delkin POWER 512GB (1780MB/s) CFexpress Type B £139

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Good price? No.

400 Mbs is an incredibly slow write speed for that format.
 
Good price? No.

400 Mbs is an incredibly slow write speed for that format.
Write speed is 1700 odd MB/s, guaranteed sustained write speed is 400MB/s so fine for 8k 30fps & reviews seem good, nearly as fast fps as Delkin black cards.
 
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Possibly OK for video (which it's designed for), high volume bursts of RAW would be a different matter.
 
Just for info
Tried the card in a Nikon Z8 I get 120 raw pics in 6 seconds then it starts to slow down, buffer then clears in a few seconds. Ok for me :)
 
Only just spotted this but the sustained rate is actually 800MB/s according to the Delkin website, it’s why I originally bought them for my Z9 a year ago.
 
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Only just spotted this but the sustained rate is actually 800MB/s according to the Delkin website, it’s why I originally bought them for my Z9 a year ago.
I can’t find where I got the 400MB/s from now but quite happy with the card and no issues with heat, temp comparison I saw rated the power very close to the Delkin black - which was one of or the best
 
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