When I think of NAS, there are always three brands that came to my mind. Synology, QNAP, and ASUSTOR. All three brands are from Taiwan. I reviewed Synology NAS many times and did my first QNAP NAS review in December.
To complete the trilogy, I have with me the Asustor Lockerstor 4 (AS6604T) which is equivalent to the Synology DS920+ and QNAP TS-453D. All three models are 4-bay NAS, powered by Intel Celeron J4125 and comes with 4GB of DDR4 ram. Intel J4125 is a 4-core 2.0 GHz (burstable to 2.7 GHz) processor.