Head-to-head · Best Cfexpress Type B Cards

Pergear CF Exp B 4.0 512GB Card 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

Pergear CF Exp B 4.0 512GB Card comes out ahead by a clear margin (4.8 vs 3.5). The gap is mostly about buyers on a tight budget — read the strengths below before deciding.

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

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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

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.

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	Pergear CF Exp B 4.0 512GB Card	Prograde Iridium CF Exp 4.0 B 800GB card
Capacity	512 GB	800GB
Read Speed	3500 MBps	3550MB/s
Write Speed	3400 MBps	3000MB/s
Sustained Write Speed	800 MBps	1500MB/s
Interface	CFexpress Type B	CFExpress Type B
Warranty	5-Year ironclad warranty	—
Sustained Write	800 MB/s	850MB/s
Card Type	CFexpress Type B	CFexpress Type-B

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