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A modified HP ProDesk/EliteDesk 400 G3 mini PC ran cooler after its owner replaced much of the stock cooling arrangement with a tower-style CPU cooler. Hackaday reported idle temperatures falling from 50°C to 25°C and load temperatures from 79°C to 40°C. Those are the reported Celsius readings—not a general promise that any mini PC can be made “50% cooler.”
What the “50% cooler” claim means
Hackaday’s March 13, 2022 report by Arya Voronova describes G3R’s project: modifying an HP ProDesk/EliteDesk 400 G3 used as a home emulation center. The stock system overheated as CPU load rose, leading to frame drops, stutter, and CPU throttling. After the modification, the reported readings were lower:
| Condition | Before | After |
|---|---|---|
| Idle | 50°C | 25°C |
| Under load | 79°C | 40°C |
Hackaday described each result as a 50% numerical reduction. Because Celsius is not an absolute ratio scale, that phrasing can mislead: the useful comparison is the actual before-and-after temperatures. The report does not describe an independent laboratory test or controlled comparative study.
What the modification involved
This was a custom cooler graft, not a drop-in replacement. The builder altered the original cooling hardware to make room for a tower CPU cooler, modifying both the heatsink and the case.
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- Removed part of the original heatsink fins and smoothed the section that remained.
- Cut an opening in the upper case for clearance.
- Rewired fan connections.
- Made custom brackets to mount the tower fan.
Hackaday characterizes the work as mechanically harsh and invasive. It involves irreversible case cutting as well as heatsink alteration, wiring work, and fabrication; it is not a routine upgrade that can be assumed to preserve the original configuration.
What the results say—and what they do not
G3R reported smoother Breath of the Wild emulation after the change, alongside less throttling. That is useful practical context for this particular machine and workload, but it is not a standardized performance or cooling benchmark.
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The report does not provide standardized measurements for acoustic output, power use, ambient temperature, or component lifespan. The temperatures therefore should not be treated as a guarantee for other workloads or systems. Results can depend on the exact chassis and motherboard, fan header and wiring, cooler dimensions, ambient conditions, and how the machine is used.
Could the same approach work on another mini PC?
A separate public project on a Lenovo ThinkCentre M900 Tiny describes replacing the original heatsink and fan with an ID-Cooling SE-214-XT. Its author reported 30°C at idle and 50°C under full load. This is an example of a tower-style cooler being used on another Tiny system; it does not establish compatibility with the HP 400 G3 or any other model.
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Mini PCs differ in their board layout, case clearance, mounting points, fan headers, and cooling hardware. A cooler that works in one model cannot be assumed to fit another, and the HP modification’s custom brackets and case opening underline how model-specific the work can be.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What to check before attempting a similar build
- Physical clearance: Check the cooler’s height and footprint against the case, motherboard components, and any planned case opening.
- Mounting: Establish how the cooler will attach securely; the HP project required custom brackets.
- Electrical compatibility: Confirm the fan connector, header, and wiring arrangement for the specific motherboard before connecting a replacement fan.
- Thermal comparison: Compare temperatures under the same workload and conditions rather than relying on a single reading.
- Trade-offs: Consider noise, throttling and frame stability, reversibility, fabrication effort, and cost—not temperature alone.
- Irreversible work: Account for the case cutting and heatsink alteration before deciding whether the change is acceptable.
The Hackaday account gives no standardized noise, power, ambient-temperature, lifespan, or cost figures for the build, so those factors must be assessed for the specific machine and proposed parts.
Quick Recap
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