Head-to-head · Best Cfexpress Type B Cards

OWC Atlas Ultra (CFe 4.0) vs Prograde Iridium CF Exp 4.0 B 800GB card

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

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The short answer

OWC Atlas Ultra (CFe 4.0) comes out ahead by a clear margin (4.3 vs 3.5). The gap is mostly about video-first hybrid creators — read the strengths below before deciding.

Higher ratedRanked #3 in Best Cfexpress Type B Cards

OWC Atlas Ultra (CFe 4.0)

4.3

3 sourcesall derived

TechRadar called the OWC Atlas Ultra CFexpress Type-B 1TB a fast and durable memory card that unlocks the full potential of high-resolution cameras. The card delivers impressive read speeds up to 3650MB/s and write speeds up to 3000MB/s, with firmware upgradeability via OWC Innergize software. While it's significantly faster than traditional SD cards, its premium pricing and requirement for a specific OWC reader for full software support make it a niche choice for professional creatives who demand top-tier performance. Newsshooter noted its exceptional speed and compatibility with Sony cameras, though the cost remains a barrier for casual users.

Strengths

— Enhanced speed performance with read speeds up to 3650MB/s and write speeds up to 3000MB/s
— Firmware upgradeability supported by OWC Innergize software
— Durable build quality resistant to UV, shock, drop, and extreme temperatures

Watch-outs

— Requires OWC Reader for full Innergize software functionality
— The product is relatively expensive.

Buy at bhphotovideo.com Full review →

Ranked #4 in Best Cfexpress Type B Cards

Prograde Iridium CF Exp 4.0 B 800GB card

3.5

5 sources1 derived$799.99as of Oct 1

ProGrade Digital's Iridium CFExpress 4.0 Type B 800GB card delivers exceptional performance with read speeds up to 3550MB/s and write speeds up to 3000MB/s. Thessdreview noted its compatibility with USB 4.0 standard and low power consumption ideal for extended video recording. The card comes with software tools including RefreshPro for sanitization, though performance is optimized when paired with the ProGrade PGM12 reader and a USB 4.0 or Thunderbolt 4/5 port. This makes it a top choice for professional videographers and photographers seeking maximum speed, but users must ensure compatible hardware for peak performance.

Strengths

— Achieves up to 3550MB/s read speed and 3000MB/s write speed
— Supports USB 4.0 standard for high-speed data transfer
— Designed for continuous video recording with low power consumption

Watch-outs

— Performance is dependent on using the ProGrade PGM12 USB4 CFExpress B Card Reader
— Requires USB 4.0 or Thunderbolt 4/5 PC port for maximum speeds

$799.99 · Check Price on Amazon Full review →

Derived means the reviewer published no score, so one was inferred from their written verdict. Everything else is a number the publisher printed. How we rank.

How they stack up

OWC Atlas Ultra (CFe 4.0)

The OWC Atlas Ultra CFexpress 4.0 Type B 1TB card delivers read speeds up to 3650 MB/s and write speeds up to 3000 MB/s, matching the performance of the ProGrade Iridium card. Its premium pricing and hardware dependency make it less accessible compared to the more universally compatible Lexar Professional series.

Prograde Iridium CF Exp 4.0 B 800GB card

The ProGrade Iridium CF Exp 4.0 B 800GB card delivers read speeds up to 3550 MB/s and write speeds up to 3000 MB/s, outperforming the OWC Atlas Ultra's 3650 MB/s read speed and 3000 MB/s write speed, but it requires a ProGrade PGM12 USB4 reader for maximum performance. Its dependency on specific hardware makes it less universally compatible.

Specs side-by-side

Spec	OWC Atlas Ultra (CFe 4.0)	Prograde Iridium CF Exp 4.0 B 800GB card
Capacity	1TB	800GB
Read Speed	Up to 3650MB/s	3550MB/s
Write Speed	Up to 3000MB/s	3000MB/s
Interface	PCIe 4.0 x2	CFExpress Type B
Warranty	2 years	—
Card Type	CFexpress Type B	CFexpress Type-B
Sustained Write Speed	—	1500MB/s
Sustained Write	—	850MB/s

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