Lenovo ThinkSystem SR780a V3 7DJ51000NA 5U rack server

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.