Its Survival Tested: ProGrade CFExpress Cobalt Review


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CFExpress playing cards are made for shortly recording massive information. However, storing 5.7K video, or lengthy bursts of RAW information can create one other drawback: warmth. The ProGrade Digital CFExpress Cobalt Kind B collection makes use of a metallic casing and thermal throttling to assist the reminiscence card deal with these excessive heats. Consequently, the ProGrade boasts speeds larger than many competing fashions, with a 1500 MB/s write velocity whereas many others prime out at 1200 MB/s.

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However simply how nicely does the ProGrade CFExpress Cobalt deal with excessive temperatures? I shot 5.7K video throughout a warmth advisory, after which caught this reminiscence card within the freezer. The cardboard handles all of it with ease and velocity.

The Large Image


  • Handles excessive warmth nicely
  • Handles freezing temperatures
  • Tremendous quick recording and uploads
  • Low waste packaging


The ProGrade Digital CFExpress Cobalt each recorded high-resolution video in a warmth advisory and survived a couple of hours in a freezer unscathed. The built-in thermal throttling helps the cardboard attain larger speeds than competing choices. Each recording and importing to a pc are fast.

Actually, the one draw back to the ProGrade model is the associated fee. It sits considerably larger than competing playing cards from SanDisk. Nevertheless, it’s not an apples-to-apples comparability — this card is out there in capacities for 165 GB, 325 GB, and 650 GB whereas competing playing cards have 128, 256, and 516 GB capacities.

I’m giving the ProGrade CFExpress Cobalt 5 out of 5 stars and the Editor’s Selection Award.

Gear Used

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I used the ProGrade Digital CF Specific Cobalt with the:


The CFExpress reminiscence card is made for velocity. This ProGrade Digital possibility is rated as much as 1700 MBPS learn and 1500 MBPS write. That write velocity is a bit larger than a few of the competitors, like playing cards from SanDisk and Lexar. It additionally has a metallic casing and built-in thermal throttling to assist deal with the excessive temperatures which can be usually related to recording plenty of knowledge shortly.

ProGrade CFExpress Cobalt Tech Specs

ProGrade Digital lists the next specs:

  • NO DROPPED FRAMES: The excessive efficiency of this reminiscence card permits it to carry out at a sustained learn fee of as much as 1700MB/s and a sustained write velocity of as much as 1400MB/s.
  • UNMATCHED PERFORMANCE: Optimized for 8K*, 6K, 5K, 4K, UHD, excessive bit fee MPEG-4, and Uncooked Video
  • OPTIMIZED FOR VIDEO: Regardless of the video format you choose, the CFexpress card will let you seize video with confidence.
  • LOWER BATTERY CONSUMPTION: Get pleasure from low energy consumption for prolonged battery life when recording steady video.


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I not often discuss concerning the packaging — however I’m going to make an exception right here. The CFExpress card is available in a small cardboard field. The low-waste packaging is earth-friendly. And I loath reducing reminiscence playing cards out of massive plastic packages.

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The ProGrade Digital CFExpress Cobalt card makes use of a metallic casing and a simple design. There’s simply the casing and, on the prime, the opening the place the cardboard connects with the digital camera. There’s no lock change or write safety.

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Add speeds are going to fluctuate primarily based on the reader used — I used the ProGrade Digital reader. The reader has a CFExpress in addition to an SD card slot with a USB-C connection. It makes use of a magnet on the underside. That’s nice if in case you have a metallic desk or a metallic submitting cupboard close by. However, make sure that to maintain that magnet away out of your laptop display screen.

Construct High quality

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I recorded a one-hour, twenty-minute 5.7K video throughout a warmth advisory with temperatures within the 90s. I additionally shot images inside a blacksmith store, which shortly turn into a very popular room with 4 forges working. In each situations, the cardboard had zero points. The digital camera stored taking pictures with out missed burst photographs and I didn’t discover any dropped frames on the video. I additionally didn’t get any overheating warnings.

To see how the cardboard handles temperatures to the other excessive, I dropped it inside an ice dice tray and put it in my freezer for 3 hours. After the ice dice melted off of it, the cardboard nonetheless held all the information inside intact. Be aware that as a result of ProGrade doesn’t promote waterproofing, I stored the highest of the cardboard the place the electronics are out of the water.

The ProGrade Digital CFExpress Cobalt can deal with excessive temperatures.


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Utilizing this card, the Panasonic GH6 was in a position to shoot on the full marketed velocity, together with a 5.7K video and 75 fps bursts. I may watch the video on the again of the digital camera nearly instantly. The 75 fps has a lag, nevertheless it was considerably lower than recording with a UHS-II SD card. Extra usable bursts that gained’t refill a tough drive in 5 minutes, like 15 fps, had just about no lag time.

Uploads have been so quick that I regarded away from my laptop display screen for a break up second and Seize One was already doing accomplished importing. This was with about 140 images and a handful of brief video clips. I used to be fearful that there could be a velocity loss from my built-in SD card reader to an exterior USB-C. However that doesn’t appear to be the case right here. Uploads felt even sooner than an SD card, by no means thoughts the dongle. Be aware that totally different dongles might have an effect on velocity — so one other reader might not be fairly as quick as ProGrade’s.

I’ve gotten bizarre errors with dongles earlier than. For instance, my XQD card reader disables the web on my laptop computer when it’s plugged in. I didn’t expertise any of those points utilizing the ProGrade reader.

Who Ought to Purchase It?

The ProGrade Digital CFExpress Cobalt is a wonderful possibility for photographers and videographers that must file massive information shortly — and in excessive temperatures. It’s quick, sturdy, and unbothered by sitting in a freezer or taking pictures 5.7K within the 90s.

The playing cards are priced accordingly, nonetheless, and those who don’t want that quick velocity or excessive temperature sturdiness can discover different CFExpress playing cards at a bit friendlier value level.

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