Shared rig

2x NVIDIA DGX Spark rack - Ben Davis

2 nodes / 256GB aggregate / Custom

About this rig

Two NVIDIA DGX Spark 128GB units stacked in a 19-inch Echogear rack. Networked through a TP-Link switch and patch panel, with eero mesh Wi-Fi, CyberPower UPS, and Synology NAS storage. Running DeepSeek V4 Flash 0731 across both units with multiple concurrent sessions.

Components

NODE 1

NVIDIA DGX Spark 128GB primary gpu

NODE 2

NVIDIA DGX Spark 128GB primary gpu

Models this rig can run

Computed from 256GB of pooled memory, keeping 8 percent for the OS, runtime and context. Throughput is a ceiling from memory bandwidth, not a measured number.

Llama 3.1 405B 4-bit · 202.5GB · ~1 tok/s

Ornith-1.5-397B 4-bit · 201.5GB · ~1 tok/s

Ornith-1.0-397B 4-bit · 198.5GB · ~1 tok/s

K2 Horizon 375B 4-bit · 187.5GB · ~1 tok/s

GLM-5.3-Flash 4-bit · 160.0GB · ~18 tok/s

MiMo-V2.6-Flash 4-bit · 154.5GB · ~22 tok/s

DeepSeek V4 Flash 4-bit · 142.0GB · ~25 tok/s

DeepSeek V4 Flash 0731 4-bit · 142.0GB · ~25 tok/s

Qwen3 235B A22B 8-bit · 235.0GB · ~7 tok/s

Qwen3.8-Flash-Next 8-bit · 180.0GB · ~27 tok/s

Qwen3.8-Omni-Flash 8-bit · 125.0GB · ~1 tok/s

Command R+ 104B 8-bit · 104.0GB · ~2 tok/s

Benchmarks run on this rig

DeepSeek V4 Flash 0731 UD-Q4_K_XL 50.0 tok/s measured

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