ZC Technologies Trust Per-node monthly license rev. 01 build 21da0fd6

Cool the DGX Spark without throttling production.

A small daemon that watches GPU temperature and clamps the clock ceiling in 150 MHz steps when the silicon enters the warning band. Stock NVIDIA actuator, hysteresis controller, auto-relax when temperature returns to floor.

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[01] Measured Δ

−11 °C

[02] Baseline

83 °C @ 94% util

[03] Steady state

72 °C, same util

[04] Install time

< 60 s

[05] Target

GB10 / Blackwell

[06] Workload

Ollama, llama.cpp

Mechanism

Hot band ≥ 78 °C → step max clock down. Warm band → hold. Cool band ≤ 72 °C for 3 consecutive samples → step back up. Floor 1800 MHz, ceiling 3000 MHz.

Validation log (spark-23, production GB10)

Time	Temp	Clock	Util	Action
07:46:28	82 °C	2463 MHz	94 %	STEP_DOWN
07:47:28	83 °C	2463 MHz	94 %	STEP_DOWN
07:56:29	76 °C	1976 MHz	95 %	HOLD
08:13:44	72 °C	2093 MHz	94 %	HOLD (cool streak 1)
08:14:14	72 °C	2093 MHz	94 %	HOLD (cool streak 2)

Same Ollama workload, same util band. Temperature fell from 83 °C → 72 °C over ≈ 28 minutes. No thermal-throttle events.

Install

curl -O https://thermal.zctechnologies.org/dl/zc-thermal-control.tar.gz
tar xzf zc-thermal-control.tar.gz
cd zc-thermal-control
sudo bash install.sh

Writes /usr/local/bin/zc-thermal-control, a systemd unit, and a scoped sudoers rule for nvidia-smi -lgc. SHA-256 of the bundle: 781907430427eb6d90877b76999fa194da82434a0c427af82553107f18aee8fd.

Defaults

Flag	Default	Meaning
-hot	78 °C	Step clock down at or above this
-cool	72 °C	Step up after 3 consecutive samples at or below this
-floor	1800 MHz	Minimum max-clock during cooling
-ceil	3000 MHz	Maximum max-clock when relaxed
-step	150 MHz	Adjustment per sample
-interval	30 s	Sampling period

What this is not

Not an undervolt tool. Not a fan-curve controller (GB10 does not expose fan PWM). Not a workload scheduler. The single actuator is nvidia-smi --lock-gpu-clocks; the controller chooses when and how much.

License. Per-node monthly. One license entitles one GPU node. Quantity adjustable at checkout up to 64. Issued to ZC Technologies Trust. Source binary is delivered post-purchase; redistribution is prohibited. Uninstall removes all installed components. No telemetry is collected by the binary; the only network call made by the controller is nvidia-smi against the local driver.