Key Features. ASUS motherboard quality Marvell 1.6 G Hz CPU2GB of DDR4 RAM at 2400 Mhz fast & efficient. Dual gigabit Ethernet with the addition of a 10gb E port. All new diamond cut exterior Magnetic dust-proof cover Supports two hot-swappable HDDs Screwless Toolfree installation The AS40 series diamond-cut exterior has a magnetic cover for easy access to hard drives within. Its front panel hexagonal design creates a lightweight yet strong frame for added durability & protection. The AS40 series also comes with a better cooling design allowing for better airflow allowing for higher longevity & lower failure rates.ASUSTOR’s AS40 series introduces its new tool-free caddies as a way to simplify installation of hard drives. Each NAS comes included with brackets to install the drive easily. On the AS4000 series hot-swapping of hard drives is supported allowing you to change hard drives easily without powering down the NAS..