Will the CR40B fit my camera's memory card slot?
Only if your camera has a CFexpress Type B slot; Type A and Type B cards are not interchangeable. Silicon Power lists examples including Canon R5, Nikon Z9, Nikon Z7 II, and Panasonic LUMIX GH6, but check your own camera's manual and Silicon Power's Compatibility Search to confirm.
What is the difference between peak write speed and sustained write speed?
Peak write speed describes short bursts, such as a rapid sequence of RAW photos, while sustained write speed describes what the card can maintain over a long, continuous recording. For 4K/8K video, compare your camera's recording bitrate against the card's sustained write rating, not its peak number.
Do I need a special card reader to get the rated transfer speed?
Yes. Silicon Power states that the CR40B's highest transfer speeds are achieved only when paired with a USB4 CFexpress Type B card reader. An older or slower reader will still work but will cap your computer-side transfer speed below the card's rated maximum.
Does write speed differ by capacity?
Yes. Sequential write is rated at 1000 MB/s for 512GB, 2000 MB/s for 1TB, and 2800 MB/s for 2TB, with sustained write at 800/2000/2600 MB/s respectively. The 2TB card carries the highest ratings across the board.
Can the CR40B handle 8K video recording?
Silicon Power markets the CR40B for high-bitrate 4K/8K video capture, with sustained write up to 2600 MB/s on the 2TB card. Whether it keeps up with your specific camera's 8K bitrate depends on that bitrate and the capacity you choose; check your camera's actual recording specifications against the card's sustained rating.
How cold or hot can the CR40B safely operate?
Silicon Power rates operating temperature at -12°C to 72°C and storage temperature at -40°C to 85°C. This gives meaningful cold-weather headroom for outdoor shooting, though your camera body and battery will usually reach their own limits first.
Is the CR40B durable enough for field or action use?
Silicon Power specifies resistance to shock, bending, and impact, plus ESD resistance. These are the manufacturer's durability claims for handling on set or in the field; they describe resistance to physical stress, not a specific drop-height or waterproof rating.
Is the CR40B officially endorsed by any camera or production brands?
Silicon Power's product page states the CR40B is officially recommended by Blackmagic Design. This is the manufacturer's claim as published on their own site; independent confirmation was not found at the time of writing.
Which capacity should I choose: 512GB, 1TB, or 2TB?
It depends on your shoot length and recording bitrate, since both write speed and sustained write speed scale up with capacity. The 2TB card has the highest sequential and sustained write ratings, so it suits the most demanding high-bitrate video work; smaller capacities suit shorter shoots or lower bitrates.
Where can I find the official datasheet and part numbers?
Silicon Power's official product page lists the part numbers (SP512GBCFEB41V10 for 512GB, SP001TBCFEB41V10 for 1TB, and SP002TBCFEB41V10 for 2TB) and offers a PDF datasheet under File Download.