The Best 4Aggregated review·14 sources·updated September 28, 2026·checked September 28, 2026

Best Cfexpress Type B Cards

Top 4 cfexpress type b cards reviewed and ranked.

This guide aggregates 14 published reviews across 4 products; the thinnest-sourced pick rests on 3. No publisher printed a score for the top pick — its rating is derived from what reviewers wrote. How we rank.

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.

Quick answer

Pergear CF Exp B 4.0 512GB Card is our top pick for cfexpress type b cards — an averaged 4.8/5 across 3 published reviews. Runner-up: OWC CF Exp B 4.0 512 GB card (~$399.99).

Read the Pergear CF Exp B 4.0 512GB Card review →Check Price on Amazon

At a glance

Tap any product for the full review

#	Product	Rating	Price	Best for
1	Pergear CF Exp B 4.0 512GB CardTop Score	4.8 3 sourcesall derived	—	buyers on a tight budget	Check Price on Amazon
2	OWC CF Exp B 4.0 512 GB card	4.5 3 sourcesall derived	$399.99	video-first hybrid creators	$399.99 · Check Price on Amazon
3	OWC Atlas Ultra (CFe 4.0)	4.3 3 sourcesall derived	—	video-first hybrid creators	Buy at bhphotovideo.com
4	Prograde Iridium CF Exp 4.0 B 800GB card	3.5 5 sources1 derived	$799.99	video-first hybrid creators	$799.99 · Check Price on Amazon

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.

At a glance4 products ▾

1Pergear CF Exp B 4.0 512GB CardTop Score

4.8

3 sourcesall derived

Best for: buyers on a tight budget

Check Price on Amazon

2OWC CF Exp B 4.0 512 GB card

4.5

3 sourcesall derived

$399.99Best for: video-first hybrid creators

$399.99 · Check Price on Amazon

3OWC Atlas Ultra (CFe 4.0)

4.3

3 sourcesall derived

Best for: video-first hybrid creators

Buy at bhphotovideo.com

4Prograde Iridium CF Exp 4.0 B 800GB card

3.5

5 sources1 derived

$799.99Best for: video-first hybrid creators

$799.99 · Check Price on Amazon

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.

Reviews aggregated from

AdamsfavesPhillipreeveKieranhayesphotographyRobtrekFotocareHudsonhenryphotographyTechRadarNewsshooter

The full ranking

How we rank →

#1 · Top Score

Best for: buyers on a tight budget

Pergear CF Exp B 4.0 512GB Card

4.8

3 sourcesall derived

Pergear's CFexpress Type B 512GB card delivers excellent read speeds that nearly match its theoretical maximum, according to phillipreeve.net. Kieran Hayes Photography praised its performance in high-speed burst mode and RAW video recording, noting it runs cool and offers a 5-year warranty. The card's write performance, while strong, does not reach its advertised peak speed. The review indicates this card is well-suited for demanding professional use cases but may not be the fastest option available in the market.

Strengths

— Read speed of 3367 MB/s closely approaches the manufacturer's theoretical peak of 3500 MB/s
— Write speed of 2350 MB/s significantly exceeds the guaranteed minimum sustained write speed of 800 MB/s

Watch-outs

— Write speed performance falls short of the advertised peak of 3400 MB/s
— Sustained write speed of 800 MB/s is lower than some competitors like the 1 TBTE model

▾Why it's ranked here

Strengths

— Read speed of 3367 MB/s closely approaches the manufacturer's theoretical peak of 3500 MB/s
— Write speed of 2350 MB/s significantly exceeds the guaranteed minimum sustained write speed of 800 MB/s

Watch-outs

— Write speed performance falls short of the advertised peak of 3400 MB/s
— Sustained write speed of 800 MB/s is lower than some competitors like the 1 TBTE model

Check Price on Amazon Full review →vs. OWC CF Exp B 4.0 512 GB card →

Best for: video-first hybrid creators

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

Watch-outs

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

▾Why it's ranked here

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

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 →vs. Pergear CF Exp B 4.0 512GB Card →

Best for: video-first hybrid creators

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

Watch-outs

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

▾Why it's ranked here

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

Watch-outs

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

Buy at bhphotovideo.com Full review →vs. Pergear CF Exp B 4.0 512GB Card →

Best for: video-first hybrid creators

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

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

▾Why it's ranked here

Strengths

— Achieves up to 3550MB/s read speed and 3000MB/s write speed
— Supports USB 4.0 standard for high-speed data transfer

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 →vs. Pergear CF Exp B 4.0 512GB Card →

Reviews aggregated from

AdamsfavesPhillipreeveKieranhayesphotographyRobtrekFotocareHudsonhenryphotographyTechRadarNewsshooter

Spec comparison

4 products

Spec	Pergear CF Exp B 4.0 512GB Card	OWC CF Exp B 4.0 512 GB card	OWC Atlas Ultra (CFe 4.0)	Prograde Iridium CF Exp 4.0 B 800GB card
Capacity	512 GB	512GB	1TB	800GB
Read Speed	3500 MBps	3,650MB/s	Up to 3650MB/s	3550MB/s
Write Speed	3400 MBps	3,000MB/s	Up to 3000MB/s	3000MB/s
Sustained Write Speed	800 MBps	up to 800MB/s	—	1500MB/s
Interface	CFexpress Type B	CFexpress 4.0	PCIe 4.0 x2	CFExpress Type B
Warranty	5-Year ironclad warranty	3-Year OWC Limited Warranty	2 years	—
Sustained Write	800 MB/s	800 MB/s	—	850MB/s
Card Type	CFexpress Type B	CFexpress Type B	CFexpress Type B	CFexpress Type-B

Spec	Pergear CF Exp B 4.0 512GB Card	OWC CF Exp B 4.0 512 GB card
Capacity	512 GB	512GB
Read Speed	3500 MBps	3,650MB/s
Write Speed	3400 MBps	3,000MB/s
Sustained Write Speed	800 MBps	up to 800MB/s
Interface	CFexpress Type B	CFexpress 4.0
Warranty	5-Year ironclad warranty	3-Year OWC Limited Warranty
Sustained Write	800 MB/s	800 MB/s
Card Type	CFexpress Type B	CFexpress Type B

Frequently asked questions

Which cfexpress type b card should I buy?

Pergear CF Exp B 4.0 512GB Card holds the top score for cfexpress type b cards — 4.8/5 averaged from 2 published reviews. Pergear's CFexpress Type B 512GB card delivers excellent read speeds that nearly match its theoretical maximum, according to phillipreeve.net. Kieran Hayes Photography praised its performance in high-speed burst mode and RAW video recording, noting it runs cool and offers a 5-year warranty. The card's write performance, while strong, does not reach its advertised peak speed. The review indicates this card is well-suited for demanding professional use cases but may not be the fastest option available in the market.

When was this guide last updated?

This guide was last re-checked in September 2026. Prices, links, and source ratings are re-verified on a rolling basis, and the ranking updates when the underlying scores change.

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