
Supermicro SYS-421GE-TNRT
$8,000 – $15,000 (barebones)
Enterprise 4U GPU server supporting up to 8 double-width GPUs. The go-to chassis for building high-density AI training and inference rigs.
Specifications
| Form Factor | 4U Rackmount |
| GPU Slots | Up to 8 double-width |
| CPU | Dual Intel Xeon (5th Gen) |
| RAM | Up to 4TB DDR5 |
| Network | 2x 10GbE |
Pros
- Flexible GPU configuration
- Enterprise build quality
- Excellent airflow design
Cons
- Barebones — GPUs, CPU, RAM extra
- Requires technical assembly
- Significant rack space needed
Related Articles
Best Pre-Built AI Workstation in 2026: 7 Machines Ranked by Real Workloads
We ranked 7 pre-built AI workstations by GPU power, VRAM, price, and real AI workload performance. Mac Studio M4 Max, BOXX APEXX, Puget Systems, Lambda Hyperplane, and more — tested and compared so you can skip the build and start training.
How to Build a Local AI Server for Your Business in 2026 (Complete Guide)
Build a local AI server that keeps your business data private, eliminates recurring API costs, and serves your entire team. Complete hardware guide with ROI analysis, step-by-step build instructions, software stack setup (Ollama + Open WebUI + vLLM), security hardening, and scaling path.
Related Products
Disclosure: Some links on this page are affiliate links. We may earn a commission if you make a purchase — at no extra cost to you. This helps support our independent reviews.


