If your Ryzen 7 5800X3D still runs hot after an undervolt, first check whether the Curve Optimizer setting survived a restart and is active under load. A reading near 90°C does not, by itself, prove the undervolt failed: AMD lists 90°C as this processor’s maximum operating temperature, and boost behavior, power limits, cooling, or background monitoring can also affect temperatures.
What does 90°C mean for the Ryzen 7 5800X3D?
AMD lists a maximum operating temperature (Tjmax) of 90°C for the Ryzen 7 5800X3D and recommends liquid cooling for optimal performance. A sustained temperature close to 90°C means the CPU is at its documented thermal ceiling. It does not establish whether a negative Curve Optimizer setting was applied.
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AMD also defines maximum boost as the maximum frequency a single core can reach during a bursty, single-threaded workload. That definition matters when interpreting temperature: a short temperature spike during boost is not the same evidence as a sustained temperature under a demanding workload.
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A value entered in a Windows utility may not be saved as a persistent BIOS setting. AMD Ryzen Master documents the controls “Write PBO to BIOS” and “Write CO to BIOS”; when enabled, they are intended to make those parameters persist after a system restart.
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- Before restarting: Check whether the setting is present in the utility you used and whether the relevant write-to-BIOS control is enabled.
- Restart the PC: Do not assume the value persisted just because it appeared before the restart.
- After restarting: Check the BIOS setting or confirm the curve through post-reboot telemetry in Ryzen Master. If the value is missing, treat it as unapplied until you can verify it after reboot.
BIOS-persistent settings and a Windows-applied utility differ mainly in where you verify the setting and how you recover after a restart. A BIOS-persistent value should be checked in the BIOS or with post-reboot telemetry; a value that exists only in a Windows utility needs confirmation that the utility reapplied it.
Is the negative Curve Optimizer value active, and what does it change?
AMD describes Curve Optimizer as shifting the processor’s voltage/frequency curve. A negative value shifts it toward lower voltages, and a larger offset makes a larger voltage shift. That describes the direction of the adjustment, not a guaranteed temperature reduction for every CPU or workload.
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Check the setting after reboot, then compare temperature and clock behavior under the same workload. Ryzen Master can show real-time per-core clock rates, temperatures, and voltages. If the curve is present but the temperature remains high, investigate power behavior and cooling rather than assuming the setting failed.
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PBO exposes PPT (socket power), TDC (sustained current), and EDC (peak current). AMD describes Precision Boost Overdrive as allowing operation beyond default infrastructure limits, up to the limits set by the motherboard. As a result, a negative curve can be active while permissive boost or power limits still allow high power use and temperatures.
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All-core and per-core settings involve a trade-off
| Approach | Practical trade-off |
|---|---|
| All-core Curve Optimizer | Simpler to set and evaluate across the processor, but it applies a common approach to the cores. |
| Per-core Curve Optimizer | Allows individual core settings, which can accommodate differences between cores, but takes more tuning and stability checking. |
AMD documents both all-core and per-core control concepts, but does not publish a universal offset or a guaranteed temperature drop for either approach.
How can you tell whether the setting is stable?
A setting that boots successfully is not necessarily stable in the applications you use. AMD cautions that aggressive or derived Curve Optimizer values can cause stability problems. It says Ryzen Master’s derived values depend on the stress test and the duration used during derivation, and advises checking stability with your own workloads.
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- Use the games or applications that normally load the CPU, rather than relying only on a short tuning test.
- Watch for crashes, unexpected restarts, application errors, and corrected hardware errors while testing.
- If errors occur, reduce the aggressiveness of the curve and test again. Do not assume one negative value will be stable on every 5800X3D.
AMD’s cited guidance does not establish a universally stable Curve Optimizer offset, temperature reduction, benchmark score, or stability guarantee for every Ryzen 7 5800X3D system.
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What else can keep temperatures high?
AMD’s troubleshooting guidance identifies several factors that can affect boost behavior and temperature besides the curve itself: cooling, thermal paste, motherboard design, BIOS, chipset drivers, operating-system updates, and background applications that constantly poll hardware.
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- Check the cooler: Confirm that it is mounted securely and that its fans or pump operate as expected. If you remount it, inspect the thermal paste and replace it as needed.
- Check firmware and software: Review whether the BIOS and chipset software are current, and install relevant operating-system updates.
- Check monitoring utilities: Close or investigate hardware-monitoring programs that poll sensors continuously, especially when idle temperature appears unexpectedly high.
- Consider the system itself: Motherboard design can affect boost and temperature behavior, so a curve value alone may not explain the result.
AMD recommends a liquid cooler for optimal performance, but that is not a claim that every air cooler will fail or that changing coolers will produce a fixed temperature drop. Cooler compatibility, mounting, noise, cost, and sustained cooling capacity vary by system.
What should you record to diagnose the problem?
Use Ryzen Master’s real-time readings to compare the same conditions before and after a change. Record:
- Whether the Curve Optimizer value is still present after reboot.
- Idle temperature and temperature during a sustained workload.
- Per-core clocks, voltages, and effective clocks during that workload.
- Package power, if available in your monitoring view.
If the curve disappears after restarting, focus on persistence. If it remains present but temperatures are still high, compare power and clock behavior and inspect cooling and software factors. This separates a reset setting from a thermal or power-limit issue more reliably than temperature alone.
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