Redditor builds 16x DGX Spark cluster for local frontier models

The build links 16 Asus GX10 (DGX Spark) boxes through a Mikrotik CRS804-4DDQ switch using 400-to-100 Gbit breakout cables. The owner plans two 8-node clusters to run open frontier models locally — Deepseek v4 pro, Kimi K3, GLM 5.5, and Minimax M4.