ASUS RS520A-E12-RS12U Main Picture

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The ASUS RS520A-E12-RS12U is a 2U rackmount storage server built to accommodate up to twelve 3.5-inch drives. It utilizes an AMD EPYC 9004 Series processor, which supports a massive number of PCI-Express Gen 5 lanes as well as 12 DDR5 channels - ensuring plenty of memory and I/O bandwidth for managing software-defined storage arrays.

In addition to the 12 front-accessible hot-swap bays, there are two M.2 slots for hosting the operating system and software as well as a pair of SATA connections for cache drives.

External connectivity consists of VGA output, four USB ports (2 each in front and back), two Gb LAN ports, and another LAN for remote management. There is an OCP 3.0 slot for installing a faster network adapter, though, as well as a few PCI-Express slots of varying sizes for graphics cards or other expansion needs.

Note: Includes a sliding rail kit for mounting.


Socket SP5
CPU Compatibility AMD EPYC 9004 Series
Form Factor 2U
Chipset Manufacturer AMD
Network Connectivity Onboard Dual Gigabit Ethernet (RJ45)
Network Controller Intel I350-AM2
Cooling System Heatsink and Fan
Number of Fans 8
Color Black
Memory Support
Type DDR5 ECC Registered
Maximum Speed 4800 MHz
Number of Slots 24
Maximum Size per Slot 256 GB
Maximum Amount Supported 3072 GB
Onboard Video
Chipset Manufacturer ASpeed
Processor Type AST2600
Maximum Resolution 1920x1200
External Connections
USB 3.2 Gen 1 (USB 3.0) 4
LAN (RJ45) 2
Mgmt LAN (RJ45) 1
Internal Connections
SATA III 6.0Gbps 14
M.2 Connector 2
M.2 Support 2x 80-110mm PCIe 5.0
U.2 Connector 12
Compatible TPM Asus TPM-SPI
Notes: Support up to 12 NVMe/SAS/SATA
Expansion Slots
Slot 1 PCI Express 5.0 x16
Slot 2 PCI Express 5.0 x8 in a x16 size
Slot 3 PCI Express 5.0 x16
Slot 4 PCI Express 5.0 x8 in a x16 size
Slot 5 PCI Express 5.0 x8
Slot 6 OCP 3.0
Additional Information
SLI Compatible No
Crossfire Compatible No
Built-in Webcam No
Built-in Microphone No
Bluetooth No
Integrated IO Shield Yes
Remote Management Onboard
Includes Rail Kit No
BIOS Features
EZ Flash No
OC Profiles No
Height 88.1 mm (3.5 in)
Width 449 mm (17.7 in)
Depth 840 mm (33.1 in)
Net Weight 17.95 kg (39.6 lbs)
Power Supply
Input Voltage 100-240 Vac
Wattage at 120V 1600 W
Redundancy 1+1