Head-to-head · Best Cfexpress Type B Cards

OWC Atlas Ultra (CFe 4.0) 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 4.3). The gap is mostly about buyers on a tight budget — 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 #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 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.

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 Atlas Ultra (CFe 4.0)	Pergear CF Exp B 4.0 512GB Card
Capacity	1TB	512 GB
Read Speed	Up to 3650MB/s	3500 MBps
Write Speed	Up to 3000MB/s	3400 MBps
Interface	PCIe 4.0 x2	CFexpress Type B
Warranty	2 years	5-Year ironclad warranty
Card Type	CFexpress Type B	CFexpress Type B
Sustained Write Speed	—	800 MBps
Sustained Write	—	800 MB/s

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