ProGrade Digital 800GB CFexpress 4.0 Type B Iridium Memory Card
ProGrade Digital has developed its new CFexpress Type B 4.0 Iridium class memory cards with next-generation performance leveraging PCIe Gen 4 interconnect with NVMe host controller interface for use in future Mirrorless, DSLR and high-definition cinema cameras. Available in 400GB, 800GB, and 1.6TB capacity and performance levels provide read speeds up to 35500MB/s – CFexpress Type B cards are ideal for quickly off-loading high volumes of video or RAW photos and sustained write speeds up to 850MB/s and 1500MB/s respectively – perfect for uninterrupted, cinematic capture of RAW 4K or 6K video. The CFexpress Type B Iridium cards are VPG400 rated.NOTE: Current CFexpress cameras will not be able to take advantage of the maximum speed of this card. Until CFexpress 4.0 cameras are introduced, the benefit of this card is tripling the speed of your workflow when downloading content with the ProGrade Digital PG05.6 USB 4.0 Reader.
ProGrade Digital has developed its new CFexpress Type B 4.0 Iridium class memory cards with next-generation performance leveraging PCIe Gen 4 interconnect with NVMe host controller interface for use in future Mirrorless, DSLR and high-definition cinema cameras. Available in 400GB, 800GB, and 1.6TB capacity and performance levels provide read speeds up to 35500MB/s – CFexpress Type B cards are ideal for quickly off-loading high volumes of video or RAW photos and sustained write speeds up to 850MB/s and 1500MB/s respectively – perfect for uninterrupted, cinematic capture of RAW 4K or 6K video. The CFexpress Type B Iridium cards are VPG400 rated.NOTE: Current CFexpress cameras will not be able to take advantage of the maximum speed of this card. Until CFexpress 4.0 cameras are introduced, the benefit of this card is tripling the speed of your workflow when downloading content with the ProGrade Digital PG05.6 USB 4.0 Reader.
ProGrade Digital has developed its new CFexpress Type B 4.0 Iridium class memory cards with next-generation performance leveraging PCIe Gen 4 interconnect with NVMe host controller interface for use in future Mirrorless, DSLR and high-definition cinema cameras. Available in 400GB, 800GB, and 1.6TB capacity and performance levels provide read speeds up to 35500MB/s – CFexpress Type B cards are ideal for quickly off-loading high volumes of video or RAW photos and sustained write speeds up to 850MB/s and 1500MB/s respectively – perfect for uninterrupted, cinematic capture of RAW 4K or 6K video. The CFexpress Type B Iridium cards are VPG400 rated.NOTE: Current CFexpress cameras will not be able to take advantage of the maximum speed of this card. Until CFexpress 4.0 cameras are introduced, the benefit of this card is tripling the speed of your workflow when downloading content with the ProGrade Digital PG05.6 USB 4.0 Reader.
ProGrade Digital has developed its new CFexpress Type B 4.0 Iridium class memory cards with next-generation performance leveraging PCIe Gen 4 interconnect with NVMe host controller interface for use in future Mirrorless, DSLR and high-definition cinema cameras. Available in 400GB, 800GB, and 1.6TB capacity and performance levels provide read speeds up to 35500MB/s – CFexpress Type B cards are ideal for quickly off-loading high volumes of video or RAW photos and sustained write speeds up to 850MB/s and 1500MB/s respectively – perfect for uninterrupted, cinematic capture of RAW 4K or 6K video. The CFexpress Type B Iridium cards are VPG400 rated.NOTE: Current CFexpress cameras will not be able to take advantage of the maximum speed of this card. Until CFexpress 4.0 cameras are introduced, the benefit of this card is tripling the speed of your workflow when downloading content with the ProGrade Digital PG05.6 USB 4.0 Reader.
in 88 offers
The lowest price for ProGrade Digital 800GB CFexpress 4.0 Type B Iridium Memory Card right now is $790.99 at Amazon.com.au, compared across 16 retailers.
The all-time low was $550.99 on 13 Sept 2025 — today's price is 44% above the lowest ever. It has been notably cheaper before — worth setting a price alert.
Prices last updated 3 Oct 2026.
Last updated at 03/10/2026 08:55:09
ProGrade Digital CFexpress 4.0 Type B Memory Card (400GB) Iridium
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
ProGrade Digital 400GB CFexpress 4.0 VPG 400 Memory Card Type B
Delivery $36.01
CFexpress 4.0 Type B Memory Card (400GB) Iridium | Read Speed Up To 3550Mb/S and Write Speed Up To 3000Mb/S for Raw Photo Bursts and 8K, 6K, and 4K Vi
Free delivery between 14–16 Oct
ProGrade Digital 400GB CFexpress Type B 4.0 VPG 400 (Iridium)
Delivery $9.95
ProGrade Digital 400GB CFexpress Type B 4.0 VPG 400 Memory Card (Iridium)
Free delivery
ProGrade Digital 400GB CFexpress 4.0 Type B Iridium Memory Card
Delivery $4.90
ProGrade Digital Iridium 400GB CFexpress 4.0 Type B 3550MB/s Memory Card
Delivery $9.90
ProGrade Digital 400GB CFexpress Type B 4.0 VPG 400 (Iridium) | Metal Enclosure | Raw 8K 6K 4K Video Capture
Delivery between 12–15 Oct $8.95
ProGrade Digital 400GB CFExpress Type B 4.0 VPG 400 Memory Card (Iridium)
Free delivery between 8–13 Oct
ProGrade Digital CFexpress VPG 400 Type B 4.0 Memory Card (Iridium)
Delivery $15
originally posted on progradedigital.com
I shoot stills, not video. I recently had the experience of a CF express type B card becoming unreadable while containing my best-ever photos of a hawk in flight. I eventually got the data recovered, but doing so was expensive and not something I ever want to repeat. One thing I am doing to avoid this situation is to have my Z9 record to both cards, rather than to record on one and use the other for overflow. I was concerned that this approach might cause buffer problems when I shoot continuously. For that reason, I got some of the newly released 400 GB iridium cards. I then tried shooting continuously to see what would happen. To duplicate lousy but not unusual conditions, I set the shutter speed to 1/4000, the aperture to wide open, and the ISO to 12800, since I ... MoreI shoot stills, not video. I recently had the experience of a CF express type B card becoming unreadable while containing my best-ever photos of a hawk in flight. I eventually got the data recovered, but doing so was expensive and not something I ever want to repeat. One thing I am doing to avoid this situation is to have my Z9 record to both cards, rather than to record on one and use the other for overflow. I was concerned that this approach might cause buffer problems when I shoot continuously. For that reason, I got some of the newly released 400 GB iridium cards. I then tried shooting continuously to see what would happen. To duplicate lousy but not unusual conditions, I set the shutter speed to 1/4000, the aperture to wide open, and the ISO to 12800, since I was in the woods and the day was totally overcast. Also, I was shooting uncompressed RAW files, which ended up at something over 60 MG each, as I recall, at 20 FPS. On each of several tries I got over 50 shots before the buffer slowed down. I figure that this will not be a problem for me, but if it is, I can always switch to lightly compressed RAW files.I have since had a couple of sessions shooting hummingbirds at 20 FPS, without ever hitting the buffer limit.
originally posted on bhphotovideo.com
I just bought this for a birding trip to Costa Rica- Lightening fast!
originally posted on bhphotovideo.com
I got these cards only a couple days ago for my new A1. They worked great for those few days but now the camera refuses to boot up with these cards. At first I thought it was the camera but eventually after cycling through all my batteries and dummy batteries multiple times I took the cards out and the camera turned on again.I put in some other cards and the camera turned on. I put these in again and the A1 would not turn on. Put in the other ones and it powers on again. Tried these cards again and it won't turn on anymore. It's very clear to me the issue is with these cards. The ones that work by the way are Prograde 256GB UHS-II cards. I got these because I like the brand but I don't know anymore.I'm trying to figure out the issue with prograde and hopefully ... MoreI got these cards only a couple days ago for my new A1. They worked great for those few days but now the camera refuses to boot up with these cards. At first I thought it was the camera but eventually after cycling through all my batteries and dummy batteries multiple times I took the cards out and the camera turned on again.I put in some other cards and the camera turned on. I put these in again and the A1 would not turn on. Put in the other ones and it powers on again. Tried these cards again and it won't turn on anymore. It's very clear to me the issue is with these cards. The ones that work by the way are Prograde 256GB UHS-II cards. I got these because I like the brand but I don't know anymore.I'm trying to figure out the issue with prograde and hopefully that'll fix it. Maybe mine are faulty. Maybe the guy who left a 5 star review has 24 hours left before his self destruct. Maybe I'm crazy. But if I were you I'd avoid them for now.
| Max Read Speed | 3550 MB/s |
| Max Write Speed | 3000 MB/s |
| Sustained Write Speed | 1500 MB/s |
| Min Write Speed | 400 MB/s |
| Card Type | CFexpress Type B |
ProGrade Digital CFexpress 4.0 Type B Memory Card (400GB) Iridium
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
ProGrade Digital 400GB CFexpress 4.0 VPG 400 Memory Card Type B
Delivery $36.01
CFexpress 4.0 Type B Memory Card (400GB) Iridium | Read Speed Up To 3550Mb/S and Write Speed Up To 3000Mb/S for Raw Photo Bursts and 8K, 6K, and 4K Vi
Free delivery between 14–16 Oct
ProGrade Digital 400GB CFexpress Type B 4.0 VPG 400 (Iridium)
Delivery $9.95
ProGrade Digital 400GB CFexpress Type B 4.0 VPG 400 Memory Card (Iridium)
Free delivery
I shoot stills, not video. I recently had the experience of a CF express type B card becoming unreadable while containing my best-ever photos of a hawk in flight. I eventually got the data recovered, but doing so was expensive and not something I ever want to repeat. One thing I am doing to avoid this situation is to have my Z9 record to both cards, rather than to record on one and use the other for overflow. I was concerned that this approach might cause buffer problems when I shoot continuously. For that reason, I got some of the newly released 400 GB iridium cards. I then tried shooting continuously to see what would happen. To duplicate lousy but not unusual conditions, I set the shutter speed to 1/4000, the aperture to wide open, and the ISO to 12800, since I ... MoreI shoot stills, not video. I recently had the experience of a CF express type B card becoming unreadable while containing my best-ever photos of a hawk in flight. I eventually got the data recovered, but doing so was expensive and not something I ever want to repeat. One thing I am doing to avoid this situation is to have my Z9 record to both cards, rather than to record on one and use the other for overflow. I was concerned that this approach might cause buffer problems when I shoot continuously. For that reason, I got some of the newly released 400 GB iridium cards. I then tried shooting continuously to see what would happen. To duplicate lousy but not unusual conditions, I set the shutter speed to 1/4000, the aperture to wide open, and the ISO to 12800, since I was in the woods and the day was totally overcast. Also, I was shooting uncompressed RAW files, which ended up at something over 60 MG each, as I recall, at 20 FPS. On each of several tries I got over 50 shots before the buffer slowed down. I figure that this will not be a problem for me, but if it is, I can always switch to lightly compressed RAW files.I have since had a couple of sessions shooting hummingbirds at 20 FPS, without ever hitting the buffer limit.
I just bought this for a birding trip to Costa Rica- Lightening fast!
I got these cards only a couple days ago for my new A1. They worked great for those few days but now the camera refuses to boot up with these cards. At first I thought it was the camera but eventually after cycling through all my batteries and dummy batteries multiple times I took the cards out and the camera turned on again.I put in some other cards and the camera turned on. I put these in again and the A1 would not turn on. Put in the other ones and it powers on again. Tried these cards again and it won't turn on anymore. It's very clear to me the issue is with these cards. The ones that work by the way are Prograde 256GB UHS-II cards. I got these because I like the brand but I don't know anymore.I'm trying to figure out the issue with prograde and hopefully ... MoreI got these cards only a couple days ago for my new A1. They worked great for those few days but now the camera refuses to boot up with these cards. At first I thought it was the camera but eventually after cycling through all my batteries and dummy batteries multiple times I took the cards out and the camera turned on again.I put in some other cards and the camera turned on. I put these in again and the A1 would not turn on. Put in the other ones and it powers on again. Tried these cards again and it won't turn on anymore. It's very clear to me the issue is with these cards. The ones that work by the way are Prograde 256GB UHS-II cards. I got these because I like the brand but I don't know anymore.I'm trying to figure out the issue with prograde and hopefully that'll fix it. Maybe mine are faulty. Maybe the guy who left a 5 star review has 24 hours left before his self destruct. Maybe I'm crazy. But if I were you I'd avoid them for now.
| Max Read Speed | 3550 MB/s |
| Max Write Speed | 3000 MB/s |
| Sustained Write Speed | 1500 MB/s |
| Min Write Speed | 400 MB/s |
| Card Type | CFexpress Type B |
