Head-to-head · Best Cfexpress Type B Cards

OWC Atlas Ultra (CFe 4.0) vs OWC CF Exp B 4.0 512 GB 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.

Verdict is reader-supported. As an Amazon Associate we earn from qualifying purchases. Some links on this page are affiliate links — if you click through and buy, we may earn a small commission at no extra cost to you. Our ratings are sourced from independent publications, not sponsors.

The short answer

OWC CF Exp B 4.0 512 GB card comes out ahead by a narrow margin (4.5 vs 4.3). The gap is mostly about video-first hybrid creators — read the strengths below before deciding.

Ranked #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 →

Higher ratedRanked #2 in Best Cfexpress Type B Cards

OWC CF Exp B 4.0 512 GB card

4.5

3 sourcesall derived$399.99as of Oct 1

The OWC Atlas Pro CFexpress 4.0 Type B memory card delivers exceptional performance with peak write speeds up to 3,000MB/s and read speeds up to 3,650MB/s, making it ideal for professional photographers and filmmakers capturing 6K video or shooting at high frame rates. It offers robust durability against environmental challenges and supports sustained write speeds up to 800MB/s, though its $399.99 price point and requirement for a separate USB4 reader for full performance may deter some users. This card is particularly beneficial for those working with Sony Alpha cameras and other high-end systems that demand fast data throughput.

Strengths

— Delivers peak write speeds up to 3,000MB/s and read speeds up to 3,650MB/s
— Supports sustained write speeds up to 800MB/s for professional workflows
— Durable design resistant to shocks, drops, extreme temperatures, UV rays, and X-rays

Watch-outs

— Expensive, priced at $399.99 for the 512GB model
— Requires OWC USB4 reader for full speeds, which is not included

$399.99 · 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.

OWC CF Exp B 4.0 512 GB card

The OWC CF Exp B 4.0 512 GB card delivers peak write speeds up to 3000 MB/s, matching the performance of the ProGrade Iridium card. Its premium pricing at $399.99 makes it less competitive compared to the more affordable Pergear 512GB card.

Specs side-by-side

Spec	OWC Atlas Ultra (CFe 4.0)	OWC CF Exp B 4.0 512 GB card
Capacity	1TB	512GB
Read Speed	Up to 3650MB/s	3,650MB/s
Write Speed	Up to 3000MB/s	3,000MB/s
Interface	PCIe 4.0 x2	CFexpress 4.0
Warranty	2 years	3-Year OWC Limited Warranty
Card Type	CFexpress Type B	CFexpress Type B
Sustained Write Speed	—	up to 800MB/s
Sustained Write	—	800 MB/s

← See the full ranking of best cfexpress type b cards