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Lenovo ThinkSystem SR780a V3 5U rack server front view with drive bays and cooling vents

Lenovo

Lenovo ThinkSystem SR780a V3 7DJ51000NA 5U rack server

SKU CH-6NPK-EZNEA MPN 7DJ51000NA

5U rack server supporting eight high-performance GPUs with direct liquid cooling for CPU, GPU and NVLink switches

  • TypeRack
  • Rack Height5U
  • Hot-swap FansDirect Liquid Cooling for CPU, GPU, and NVLink Switches Air
  • MAX Processors2
  • Max Memory Capacity4TB
  • Number of Memory Slots32
  • Neptune liquid cooling sustains peak GPU and CPU performance
  • Eight fully interconnected high-performance GPUs deliver massive compute throughput
  • Dual 5th Gen Intel Xeon processors with 32 DDR5 DIMM slots support up to 4 TB memory
  • Twelve hot-swap U.2/U.3 NVMe bays plus two M.2 boot drives provide dense storage
  • Ten PCIe Gen5 x16 slots and eight hot-swap power supplies enable flexible expansion and N+N redundancy

5U GPU server for dense compute

The Lenovo ThinkSystem SR780a V3 7DJ51000NA is a 5U rack server built for high-density GPU workloads. It supports up to eight high-performance GPUs with direct liquid cooling on CPUs, GPUs, and NVLink switches. Two Xeon processors and 32 DDR5 DIMM slots deliver up to 4TB of memory. This platform targets AI training, HPC modelling, and large-scale inference clusters.

Upgrade from air-cooled multi-GPU racks

The jump is worth it when thermal headroom limits sustained GPU clock speeds or when NVLink switch temperatures throttle interconnect bandwidth. Neptune™ liquid cooling removes heat directly from the hottest components, allowing continuous peak performance. The 10 PCIe Gen5 x16 slots (eight front, two rear) replace older Gen4 backplanes, doubling per-lane bandwidth for GPU-to-GPU and GPU-to-CPU paths.

Fits liquid-ready datacentre rows

The chassis requires facility-grade coolant distribution units and manifolds for the direct liquid loops; the remaining subsystems use N+1 hot-swap fans. Up to 12 U.2/U.3 hot-swap NVMe bays and two M.2 boot devices sit behind the front panel, freeing rear space for networking. Eight hot-swap power supplies provide N+N redundancy without external distribution boxes. Builders needing only air cooling or fewer than four GPUs should consider smaller form factors.

Highlights

  • Neptune liquid cooling sustains peak GPU and CPU performance
  • Eight fully interconnected high-performance GPUs deliver massive compute throughput
  • Dual 5th Gen Intel Xeon processors with 32 DDR5 DIMM slots support up to 4 TB memory
  • Twelve hot-swap U.2/U.3 NVMe bays plus two M.2 boot drives provide dense storage
  • Ten PCIe Gen5 x16 slots and eight hot-swap power supplies enable flexible expansion and N+N redundancy

Specifications

BrandLenovo
SeriesThinkSystem SR780a V3
Model7DJ51000NA
TypeRack
Rack Height5U
Hot-swap FansDirect Liquid Cooling for CPU, GPU, and NVLink Switches
Air cooled with N+1 hot-swap fan solution for the rest of the system
MAX Processors2
Max Memory Capacity4TB
Number of Memory Slots32
GPU TypeSupports 8x high-performance GPUs
Remote ManagementXClarity Controller2 (XCC2), which provides advanced service-processor control, monitoring, and alerting functions. The XCC2 consolidates the service processor functionality, super I/O, video controller, and remote presence capabilities into a single chip on the server system board.
Expansion SlotsUp to 10x PCIe Gen5 x16 FHHL adapters:
- 8x in front connected to PCIe switch for GPU connectivity
- 2x in rear connected to CPU for CPU connectivity
Expansion BaysUp to 12x U.2/U.3 hot-swap NVMe SSDs
Up to 2x M.2 for boot (RAID via VROC)
Power CharacteristicsUp to 8x hot-swap power supplies, allowing full N+N redundancy
Shipping weight56.70 kg
Package size508 × 508 × 254 mm

Questions about this item

What rack height and depth clearance does the 5U ThinkSystem SR780a V3 require?

The server occupies a 5U rack space and uses direct liquid cooling for CPUs, GPUs and NVLink switches, so plan for coolant-distribution units and manifold clearance in addition to the standard 5U height.

How are the eight high-performance GPUs installed in the front PCIe Gen5 x16 slots, and what step is often missed?

Install each GPU into the eight front FHHL slots connected to the PCIe switch, then attach the supplied liquid-cooling cold plates and manifold fittings before powering on — skipping the coolant connections is the common error.

Which components will need periodic replacement in the liquid-cooling loop and the hot-swap fan tray?

The direct liquid-cooling loop for CPUs, GPUs and NVLink switches requires coolant refresh and filter changes per Lenovo service intervals, while the N+1 hot-swap fan tray for the remaining system airflow uses replaceable fan modules.

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