Head-to-head · Best Cfexpress Type B Cards

OWC CF Exp B 4.0 512 GB card vs Pergear CF Exp B 4.0 512GB 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

Pergear CF Exp B 4.0 512GB Card comes out ahead by a clear margin (4.8 vs 4.5). The gap is mostly about buyers on a tight budget — read the strengths below before deciding.

Ranked #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 →

Higher ratedRanked #1 in Best Cfexpress Type B Cards

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
— Supports high-speed burst mode and RAW 12-bit video recording up to 8K 60p

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 →

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 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.

Pergear CF Exp B 4.0 512GB Card

The Pergear CF Exp B 4.0 512GB card delivers read speeds that closely approach its theoretical peak of 3500 MB/s.

Specs side-by-side

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

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