4 GPU RTX 4090 LLM fine-tuning Rackmount Build

This rackmount system pairs 4x RTX 4090 24GB with AMD Threadripper PRO 7995WX for repeatable LoRA and QLoRA runs with enough memory bandwidth for long-context datasets. It uses front-to-back high-static-pressure airflow in a 4U rackmount enclosure and is positioned in the under-20k planning tier, intended for dedicated equipment rooms or datacenter rows.

Use case

LLM fine-tuning

Example system budget

$12,300 planning estimate (not live pricing).

Hardware breakdown

• GPU: 4x RTX 4090 24GB
• CPU: AMD Threadripper PRO 7995WX
• RAM: 512GB DDR5 ECC
• Storage: 8TB Samsung 990 PRO NVMe + 16TB enterprise SSD tier
• PSU: 2200W 80+ Platinum

What This Build Includes

Includes:

• GPU(s)
• CPU
• RAM
• Storage
• Motherboard

Not Included:

• Case / chassis
• Cooling system
• Power cables / adapters
• Peripherals

Deployment Notes

• High-power multi-GPU systems require proper airflow
• Ensure PSU headroom for GPU transient spikes
• Verify motherboard PCIe lane and spacing compatibility
• Suitable for workstation or rack environments