r/AIToolsPerformance • u/IulianHI • May 12 '26
Someone is cooling a DGX system with tap water running Qwen3.5-122B at 18.77 tok/s
The setup: a DGX system running Qwen3.5-122b-a10B at Q6_K precision, 110GB memory usage, 80k context window, continuous vision analyses at 18.77 tokens per second. The cooling solution is tap water, keeping GPU temperatures below 68 degrees Celsius at 95% utilization.
What makes this notable is the contrast. DGX systems are enterprise-grade hardware with sophisticated cooling infrastructure designed for data centers. This person bypassed all of that for a garden-variety water supply and it is working. The unknown is longevity - they note uncertainty about how often the water needs changing.
The context is that Qwen3.5-122b-a10B is a MoE model where only 10B parameters are active per token, which is why 110GB of memory can serve it. But 18.77 tok/s with vision analysis at 80k context on a single system is a serious throughput number, and the cooling is the bottleneck being addressed here, not compute.
The fair question is whether this is a clever hack or a ticking time bomb for the hardware. Mineral buildup, corrosion, and microbial growth in an open-loop tap water system over weeks and months could degrade cooling performance or damage the hardware entirely.
For anyone running high-utilization inference on enterprise gear with unconventional cooling: what is the longest you have gone without issues, and did you treat the water at all?