High-Density 6x RTX 4090 4U Liquid-Cooled Server

HYPERPC — server platform with 6 NVIDIA RTX 4090/5090 graphics cards

HYPERPC — rear view, connection interfaces

Client: LANGARDEN PROJECTS LLC

Challenge: Overcoming physical limitations of rack mounting

1. Challenge: Overcoming Physical Limitations

Install 6 RTX 4090/5090 level cards in a 4U chassis.

Standard cards occupy 3-4 slots, physically a maximum of 2-3 fit in the server.

Problem: Physical limitations of rack mounting do not allow installing the required number of flagship GPUs.
Risk: Inability to achieve the required computing power in a compact 4U format.
Task: Create a solution that cannot be bought "off the shelf" — place 6 flagship GPUs in a 4U chassis without performance loss.

2. Solution: Transformation and Hydrodynamics

We created a solution that cannot be bought "off the shelf". The key to success is a custom liquid cooling loop (Custom Loop).

1. GPU Transformation

We removed the standard air coolers and installed full-coverage water blocks (Full-Cover).

Result: The card transformed from a "thick" 4-slot brick into an elegant 1-slot module.
Effect: This allowed placing 6 GPUs in a row, overcoming the physical limitations of the standard rack format.

Graphics Cluster: 6x GeForce RTX 4090/5090 (Watercooled)

The foundation of computing power — six flagship NVIDIA graphics cards with custom liquid cooling.

Transformation: Removal of standard air coolers and installation of full-coverage water blocks (Full-Cover).
Result: The card transformed from a "thick" 4-slot brick into an elegant 1-slot module.
Effect: Placement of 6 GPUs in a row in a 4U chassis, stable frequencies at 100% load, no thermal throttling.

HYPERPC case — NVIDIA RTX 4090/5090 graphics accelerators with liquid cooling

HYPERPC case — Threadripper PRO 7995WX processor

Core: Threadripper PRO 7995WX

The 96-core processor provides 128 PCIe lanes.

Critical importance: This is critically important so that each of the 6 graphics cards operates at full bus speed without a "bottleneck".
Performance: Maximum bandwidth for all GPUs simultaneously.

Power Supply: Dual 4.1 kW Configuration

The dual PSU configuration ensures stability during peak consumption spikes typical of powerful GPUs.

Innovation: Two power supply units installed with a total capacity of 4100W.
Result: Stable operation of all components at maximum load without voltage drops.

Implementation Result:

The server operates without throttling under 100% load — a result unattainable with air cooling. This demonstrates our engineering excellence in the High-End HPC segment.