Testing a product that aims for Industrial and Enterprise users with traditional benchmarking software isn't fair, since the company doesn't design the product with absolute performance numbers in mind, but for durability and data safety in mind. The Greenliant CFast 256GB memory card is for applications like transportation systems, industrial automation, vending and gaming machines, medical computing, professional video and photo cameras, set-top boxes and point-of-sales (POS) equipment.
So the product promises Sequential Read / Write performance up to 550MB/s / 490MB/s... does it deliver? Of course it does. As our tests showed, the product performs very good in either sequential or random use. What’s very interesting is that CFast cards are mainly used by professional photographers like in cameras Arri Alexa Mini, Canon C300 MkII, and the Canon 1DX MkII and if you look closely you will see they are much higher priced than the normal SDXC cards we (normal) users are using.
The pro/Enterprise/industrial market is different in needs/specs and of course data storage. For sure if you are looking for a very good and fast CFast memory card with added reliability, take a look at Greenliant products, their lineup has many products and in different price ranges.