Does anyone use them in a NAS (e.g. Synology DS920+)? In which applications can you notice a noticeable improvement in speed? I use the NAS mainly for backups (in the direction of the NAS), VM's (Ubuntu, Ubuntu Server) and Docker (the RAM has already been increased to a flawlessly functioning 20gb), I would also like to try out using it as a private cloud (possibly Synology Drive or Nextcloud). I regularly make backups from the NAS to an ext. HD and to an outsourced NAS. Would Chache lead to an increase in speed in these cases? The NAS also serves as a multimedia centre, but not often. Possibly the one or other film that we like to watch more often would load faster (although the system already reacts quite quickly). With the write function of the cache, I would like the backups to be faster, but I don't know if the cache is of any use at all, currently the WLAN write rate (directly from the computer to the NAS) is between 50 and 80 mb/s and with LAN about 110 mb/s (1gbit network). Can I expect a speed increase with the use of M.2 SSD cache? The NAS should get faster the more HD's are installed (because the data is spread over several HD's and when reading/writing data, several HD's are busy with the read/write process at the same time than if the data was only on one HD and only one HD had to do the whole job...). For example, I have three Toshiba N300 HDs installed and they spin faster than usual. I wonder whether, taking into account the overall infrastructure (WLAN speed and 1gbit network), a fourth, identical HD (e.g. for the backup process?) would bring more speed (apart from the additional storage space that would then be available) than if I were to retrofit cache?