Delkin Devices 256GB CFexpress Type B G4 Memory Card for Cameras | Up to 1780MB/s Read, 1700MB/s Write | Digital Camera Memory Card for Professional Photographers and Videographers

The Delkin 325GB CFexpress card is extremely fast and has been very reliable, even under demanding and less than perfect conditions, excessive heat, and freezing cold. It has reliably written, and read at close to its rated speeds, and demanding file sizes like 6K and ProREz. Currently using it on a Nikon Z63 cinema rig and has performed flawlessly. The nikon Z6III can be a bit finicky with CF express type B cards and we did quite a bit of research on the nikon site with their recommended card types before deciding on the Delkin, time, well spent.

This is a great CF Express type B memory card. It delivers on what I was seeking for my Nikon Z6 camera system -- reliability and speed. I have had zero problems with this Delkin brand and will return as a loyal customer.

I had one of their cards fail, like two years after purchase. Their support staff was US based and incredibly helpful. They were able to get the images off of it and replaced it with a bigger card. I couldn't be happier, I will not buy any other brand.

Excellent memory card! Very reliable card and fast. Good quality!

Excellent product. Completely satisfied.

Good but pricy

Very fast.

For digital camera, faster on recording bursts. Also more captures before buffer filled.

I've purchased two of these Delkin G4 160GB CFExpress cards recently. The capacity suits me well for longer wedding shoots and they're plenty fast for the cameras I use. The first card I received from Amazon works great, but the second only delivers about HALF the write/read speed of the first, using the same card reader and same setup. So, the second card I got is either defective or fake. Naturally, the second card has been returned. Both were purchased direct from Amazon UK (not third-party supplier). *EDIT Apr '25 I thought I'd give Delkin one last try so ordered a third 160GB G4 card, but this time, while the write speed was comparable with the first card I bought, the read speed was less than half what it should be. Have you ever seen a modern memory card write twice as fast as it reads? So three identical cards, but all with different performance. Absolutely bonkers. I did email Delkin Europe with all the information, but have not even had a cursory reply from them. I'll give up and use more reliable brands instead. Sorry Delkin, but I did give you a good chance.

Provides good, reasonably fast storage at a great price (seems to have gone up a lot since I bought it at less than £100!) compared to similar cards from other makers.