MSI S4056X271RAU8 Dual GPU EPYC 2U Server Ports
USB 3.2 Gen 1 (USB 3.0) Port(s): Universal Serial Bus (USB) port for connecting USB 3.2 Gen 1 and older devices (5 Gb/s).
Power Switch: On/off button for the device.
Reset Switch: Immediately hard-restarts system. Last resort only, as it will lose unsaved data and may corrupt OS.
LAN LED: Light that turns on when there is any wired network activity.
UID Button: Press to turn both front and rear Unit Identification (UID) Lights on / off.
USB 2.0 Port(s): Universal Serial Bus (USB) port for connecting USB 2.0 and older devices (480 Mb/s).
IPMI LAN Port: RJ-45 plug for remote management of computer via IPMI (Intelligent Platform Management Interface).
Mini Displayport Out: Mini DisplayPort for outputting digital video and audio. May require an adapter for some monitors.
UID Button: Press to turn both front and rear Unit Identification (UID) Lights on / off.
Power LED: Light that is on while the system is powered on. May flash when the system is in standby / sleep.
Power Switch: On/off button for the device.
MSI S4056X271RAU8 Dual GPU EPYC 2U Server Schematic
Storage options include two internal M.2 slots for SSDs and eight front-accessible hot-swap bays for U.2 NVMe SSDs. We generally recommend putting the OS on one of the M.2 slots and then using the easy-access bays in the front for storage as needed.
External connectivity consists of four USB ports (2 each in front and back) and a port for remote management. While there is no built-in networking, there are two OCP 3.0 slots for dedicated NICs. There are also two PCIe 5.0 x16 slots for dual-width GPUs of up to 400W each.
Model: MSI 939-S378-12S
Specifications
| Socket | SP5 |
| CPU Compatibility | AMD EPYC 9004/9005 series (up to 500W) |
| Form Factor | 2U |
| Chipset Manufacturer | AMD |
| Wired Network Connectivity | N/A |
| Number of Fans | 6 |
| Color | Black |
| Windows Support | Windows Server 2025 |
| Linux Support | Yes |
Memory Support | |
| Type | DDR5 ECC Registered |
| Maximum Speed | 5200 MHz |
| Number of Slots | 24 |
| Maximum Size per Slot | 256 GB |
| Maximum Amount Supported | 6144 GB |
Onboard Video | |
| Chipset Manufacturer | ASpeed |
| Processor Type | AST2600 |
| Maximum Resolution | 1920x1200 |
| Maximum DisplayPort Resolution | 1920x1200 |
| Mini DisplayPort | 1 |
| Notes: | Adapting to non-DP may require an active adapter |
External Connections | |
| USB 2.0 | 1 |
| USB 3.2 Gen 1 (USB 3.0) | 2 |
| Mgmt LAN (RJ45) | 1 |
| Serial (COM) Port | 1 |
Internal Connections | |
| M.2 Connector | 2 |
| M.2 Support | 2x 80-110 PCIe 3.0 (x2) |
| TPM (module sold separately) | 1 |
| Compatible TPM | MSI TPM20-IRS |
| Notes: | Please note M.2 bandwidth |
Expansion Slots | |
| Slot 1 | PCI Express 5.0 x16 |
| Slot 2 | PCI Express 5.0 x16 |
| Slot 3 | OCP 3.0 |
| Slot 4 | OCP 3.0 |
Additional Information | |
| RAID Support | N/A |
| Integrated IO Shield | Yes |
| Remote Management | Included |
| Includes Rail Kit | Yes |
| Hearing Protection Advised | Yes |
Dimensions | |
| Height | 87 mm (3.4 in) |
| Width | 764 mm (30.1 in) |
| Depth | 438 mm (17.2 in) |
Power Supply | |
| Input Voltage | 100-240 Vac |
| Wattage at 120V | 1000 W |
| Wattage at 240V | 2400 W |
| Redundancy | 1+1 |
External Drive Bays
Front:
8x 2.5" hot-swap bays (NVMe)
- NVMe via U.2, PCIe 5.0 link
Rear USB 2.0 ports are configured as:
Upper: COM via USB
Lower: USB 2.0
