Komputerbay Professional 3700x 256GB CFast 2.0 Card (Up to 560MB/s Read and up to 495 MB/s Write)

Forget using a Samsung T5 SSD strapped to your cage with a gangly USB C cable, buy this card. It works faultlessly on the 6K Pro. Set the compression to 8:1 (not 5:1) - you'll get over 40 minutes recording at 6k BRAW and you'll be able to shoot 50/60FPS with zero dropped frames. I purchased the 256Gb model and it's plenty. I always drop the footage on to a Samsung T7 for editing in DaVinci Resolve and reformat the card for the next shoot.Yes, you may think a few hundred quid is expensive for a memory card, but it's a neat, tangle-free solution. Along with the Blackmagic Battery Pro Grip, they make a very comfortable duo.

This is the fastest Cfast2 card at this price. I use it with the Black Magic Pocket Cinema Camera 6k. This review is from a BMPCC 6K user. It is fast enough for all of the different bit rates and resolutions using Black Magic RAW. However it is not fast enough to do 6k @ 60fps. You would need to drop the compression to 8:1. I shoot at 6k 2.4:1. and have to drop the compression to 5:1 when shooting high frame rates using BRAW. I now have 2 of these cards. I highly recommend them. I hope that BMPCC users find this helpful.

Media isn't cheap, but when I purchased the Blackmagic URSA Mini 4.6k I was shocked at the price of CFAST cards. Went down the SSD enclosure route for 2 years with limited success (too many bugs and dropped frames), so when I upgraded to the 4.6k PRO and found these cards I gave them a punt.Almost a year later and 20 TB of content recorded in all framerates/resolutions from 4.6k 50fps RAW 3:1 to ProRes proxies and these cards haven't missed a beat. They just work. And they work great.Only gripe now is that the stickers have started to peel away sometimes causing the card to not mount properly when inserting, which can be annoying - but being a BM user for a few years, that's a very minor gripe all things considered.

The cost per GB of this card is significantly lower than competitors. My main (really only) concern was to buy a high capacity CFast card which would work with the Canon EOS 1DX mark II. So far, so good: it formats in-camera fine and works as it should. I have not had time for any long term use yet: if it fails, I will update this review, but I have no reason to lack confidence in it. At present, I cannot see the point in paying vastly more for other perhaps better known brands.

This card works fine but its important to bear in mind that it is not on Arri Alexa, Alexa Mini or Amira approved list so the card will come up as Invalid when inserted. I would have appreciated being informed of this before I purchased it. It does work perfectly with the Black Magic Ursa Mini Pro 4.6k. The labels on the cards are very weak and tear immediately if you attach masking tape to them when logging.

I had to return this as it proved to be slower than a Samsung T5 ssd drive I use on my Blackmagic Ursa Mini pro g2: for istance, while recording 4.6k Pro Res XQ video (330 MB/S) the Komputerbay Cfast card starts to drop frames after two minutes, while the Samsung 1tb ssd, which theorically has a similar write speed can easily handle it without any issues.

I have used Komputerbay CF cards in the past and had no trouble but I wanted to shoot 4k 60fps on my Canon 1DXmkii and although I had a couple of days use from this card on day 3 it refused to record 4k. FHD was no problem but 4k only recording for 10-15 secs. I formatted the card and tried various different fps and formats but no luck. My other CFast cards work no problem but either this one was a dud or they just aren't up to it. I was going to buy another one to try when I sent mine back but in a week they have gone up by £15 so I won't bother.

Bought this for my BlackMagic PCC4K - it's the cheapest on the official approved list by far. I shoot BRAW at Q5 and it has never let me down over the two months or so that I've been using it. I would definitely buy one again if I ever need more storage.