TweakGearPro
Overclock & TuningNo signupNo paywallInstant resultsUpdated 2026-08-02

Fan Curve Simulator

Visualize a custom temperature-to-RPM curve that balances cooling and noise.

Local & private by design

All processing runs locally in your browser, no data uploaded to servers. Nothing you enter leaves this page — there is no backend, no tracking pixel, no third-party API call. Close the tab and the inputs are gone.
← All toolsHow it works ↓
Curve points (drag % to tune)
30°C20%300 rpm · 17dBA
45°C30%450 rpm · 19dBA
60°C50%750 rpm · 23dBA
70°C75%1125 rpm · 28dBA
80°C100%1500 rpm · 34dBA
At 50°C
37%
At 70°C
75%
At 85°C
100%
Combined noise at 80°C load (4 fans)
~40 dBA
Clearly audible

The fan curve nobody teaches you

Out of the box, most motherboards run fans on a default curve that is either too loud at idle or too slow under load. The result is a PC that screams for no reason, or one that quietly cooks itself because the fans never ramped up. A good fan curve is a five-minute setup that pays off every day for the life of the build — but you have to design it deliberately.

The Fan Curve Simulator lets you shape a temperature-to-RPM curve across five anchor points, preview the RPM and estimated noise at each, and see the combined noise of all your fans at load. It runs in your browser.

How the tool works

You set a fan type (silent / balanced / performance), a max RPM, and how many fans you run. Then you drag the percentage at each of five temperature anchors — 30, 45, 60, 70 and 80°C. The tool interpolates linearly between anchors, estimates per-fan dBA from the RPM ratio, and combines all fans logarithmically (because decibels do not add linearly — doubling fans adds ~3 dBA, not double the loudness).

The verdict tells you whether your curve is whisper-quiet, noticeable, or loud at an 80°C load.

Step-by-step usage

  1. Pick your fan type and max RPM to match your hardware.
  2. Set the fan count so the noise estimate is honest.
  3. Shape the curve. A good gaming curve is flat and quiet to ~55°C, then ramps steeply to 80–100% by 80°C.
  4. Read the at-load noise estimate. If it says "loud," flatten the idle and mid-range and only ramp hard past 70°C.
  5. Recreate the curve in your motherboard / GPU software (BIOS, Fan Control, MSI Center, etc.).

Common hardware problems this tool solves

  • "My PC sounds like a jet engine at idle" — your curve ramps too early. Flatten it below 55°C.
  • "Temps spike before fans respond" — your ramp is too late or too shallow. Steepen the curve past 60°C.
  • "Fans click or buzz at low speed" — you are running 3-pin DC fans too slow; switch to PWM or raise the floor.
  • "GPU is hot but case fans are calm" — your curve only watches CPU temp. Point a fan header at the GPU / motherboard sensor if your BIOS supports it.

Pair this with the Case Airflow Layout Simulator and the PC Noise dB Estimator for the full acoustic picture.

Pro tips

  • Flat-then-steep is the winning shape. Silence at idle, calm at light load, aggressive only when it actually matters.
  • Use PWM (4-pin) fans for precise control. DC (3-pin) fans lower voltage and can click at low speeds.
  • 0 RPM idle is great if your cooler supports it — but make sure there is a clear ramp before 70°C so temps never run away.
  • Two or three well-placed fans beat six poorly placed ones. Fix the layout before adding fans; the curve cannot fix dead air.

A good fan curve is invisible — you forget the PC is running until a heavy load spins it up, and even then it stays calm.

Fan Curve Simulator — FAQ

What is a good fan curve for gaming?▾
Flat and quiet until ~55°C, then ramp steeply to 80–100% by 80°C. Avoid aggressive ramps at idle or the PC sounds like a jet engine for no reason.
Should fans run at 0 RPM at idle?▾
If your cooler supports it, yes — silent at idle is great. But make sure there is a clear ramp before 70°C so temps never run away.
PWM vs DC mode?▾
Use PWM (4-pin) for precise speed control. DC (3-pin) lowers voltage and works but is coarser and can cause clicking at low speeds.
How many case fans do I actually need?▾
Usually 2–3 well-placed fans beat 6 poorly placed ones. Front intake + rear exhaust handles most builds; add top exhaust for hot GPUs.
Are these hardware tools free to use?▾
Yes — every tool on TweakGearPro is 100% free, requires no account, and runs entirely in your browser. Nothing is uploaded to a server.
Do these tools work offline or send my data anywhere?▾
All processing runs locally in your browser, no data uploaded to servers. Once the page loads, the calculator works without a network connection.
Can I print or save my results?▾
Yes. Each tool has a "Print results" button that opens your browser print dialog, where you can save to PDF. Print styling hides navigation and side panels automatically.
Are the estimates accurate for my specific hardware?▾
They model typical real-world scaling across tiers, not any single SKU. Treat results as a planning baseline and always cross-check critical decisions against vendor specs and your own benchmarks.
Do the tools work on mobile?▾
Yes. Every tool stacks vertically on phones with touch-friendly inputs. Complex tables stay readable and scroll horizontally when needed.

Cross-site hardware resources

GameFixPro — Game FPS & Hardware TuningGame-side frame-rate fixes and hardware适配 guides.DevFixPro — Driver & System Error RepairDriver crash, BSOD and system error troubleshooting.