Amazon.com: Synology DiskStation DS918+ NAS Server for Business with Intel Celeron CPU, 8GB Memory, 256GB SSD, 8TB HDD, DSM Operating System : Electronics
Synology DS411+II - Noctua FAN mod - CPU + REAR - YouTube
Synology DiskStation DS411 Released - StorageReview.com
Synology CPU fan mainboard failure, simple workaround : r/synology
Synology DiskStation DS411+II Repair - Blue Flashing LED : Brian Dorey.com blog
Very old DS 411+ : r/synology
13-100100011 Synology CPU Fan for DS411 Series
13-060703048 Synology CPU Fan 40x40x10mm for DS411+II