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A Ryzen 7 5800X3D can still reach high temperatures after a negative Curve Optimizer setting: the CPU may continue boosting within permissive power limits, or cooling and background software may be affecting temperatures. First check whether the setting survives a restart, then verify its effect under your own workload. AMD lists 90°C as this processor’s maximum operating temperature (Tjmax, AMD 2022); a sustained reading near that ceiling does not, by itself, show that the undervolt failed.
Why is the 5800X3D still hot after an undervolt?
A negative Curve Optimizer (CO) value shifts the voltage/frequency curve toward lower voltages. A larger negative offset means a larger shift, but it does not set a target temperature or guarantee a particular temperature drop. Meanwhile, the processor can still boost, and the system’s cooling, power limits, firmware and software all influence the temperature you see.
AMD lists the Ryzen 7 5800X3D’s maximum operating temperature as 90°C Tjmax in its 2022 product specification and recommends a liquid cooler for optimal performance. A sustained temperature close to 90°C means the CPU is at its documented thermal ceiling; it does not identify the cause or prove that CO was ignored.
Also distinguish a brief peak from a sustained reading during a game or application. AMD defines maximum boost as “the maximum frequency achievable by a single core on the processor running a bursty single-threaded workload.” That is not a promise that all cores will sustain the same frequency under a long, heavily threaded workload.
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- Cooler not included, high-performance cooler recommended
How can you tell whether the undervolt survived a reboot?
A value shown in a Windows tuning utility is not enough to establish that it remains active after restarting. Check the setting and telemetry again after a full reboot.
- Before restarting: note the CO value and whether you changed it through BIOS or Ryzen Master.
- Make the Ryzen Master setting persistent, if applicable: AMD documents the controls “Write PBO to BIOS” and “Write CO to BIOS” for writing those parameters to BIOS so they persist after a system restart.
- Restart and check again: inspect the setting in BIOS or Ryzen Master, then confirm post-reboot behavior in telemetry. If the value is absent, treat it as unapplied rather than assuming it is active.
- If it disappeared: apply the setting through BIOS or use the relevant Ryzen Master write-to-BIOS control, restart, and verify again. Avoid judging the result from a pre-reboot display alone.
These are distinct approaches with different persistence checks:
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| Approach | What to know | How to verify |
|---|---|---|
| Set CO in BIOS | The value is configured in firmware rather than relying only on a Windows utility being open. | After restarting, check that the BIOS value remains and confirm the expected telemetry in Windows. |
| Set CO in Ryzen Master | AMD documents “Write CO to BIOS” as the control for making Curve Optimizer parameters persistent after a restart. | Use the write-to-BIOS control, restart, then confirm the setting and telemetry. A value visible only before reboot is not proof of persistence. |
Can power limits keep temperatures high even when CO is active?
Yes. Curve Optimizer changes the voltage/frequency curve; Precision Boost Overdrive (PBO) separately exposes PPT (socket power), TDC (sustained current) and EDC (peak current). AMD describes PBO as allowing operation beyond default infrastructure limits up to the board limits. A negative CO value can therefore be present while boost and power behavior still allow substantial heat under load.
Check whether PBO settings are also configured, and note package power alongside temperature and clocks. Do not assume that increasing the negative CO offset is the right response to a high temperature: first establish that the setting is active and inspect the cooling and power behavior.
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How should you test whether the curve is stable?
There is no universal negative CO value that AMD guarantees stable for every 5800X3D. AMD notes that Ryzen Master-derived values depend on the stress test and how long it runs during derivation, and advises further adjustment after checking stability with your own workloads.
- Run the games and applications you actually use, including workloads that keep the CPU busy for sustained periods.
- Watch for crashes, unexpected restarts, application errors and corrected hardware errors.
- If errors appear, reduce the aggressiveness of the curve and test again. Do not treat a brief stress test or a derived value as proof of stability in every workload.
AMD’s cited guidance does not publish a universal offset, temperature reduction, benchmark score or stability guarantee for every 5800X3D system.
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- Cooler not included, high-performance cooler recommended
What cooling and software issues should you check?
AMD’s troubleshooting guidance identifies thermal paste, system cooling, motherboard design, BIOS, chipset drivers, operating-system updates and background hardware polling as factors that can affect boost and temperature. Check these before repeatedly changing CO.
- Check cooler operation and mounting: confirm fans and, if present, the pump are operating and the cooler is seated properly. If you remove and remount it, inspect or replace the thermal paste.
- Check firmware and platform software: review the motherboard BIOS and install the latest chipset driver and operating-system updates appropriate to your system.
- Look for polling-heavy utilities: monitoring applications that constantly poll hardware can make idle temperatures appear higher. Close them temporarily and compare readings.
- Retest under the same workload: compare like with like after each change rather than attributing a temperature difference to CO when several conditions changed.
Which Curve Optimizer approach should you use?
AMD documents both all-core and per-core Curve Optimizer controls, but does not publish a universally correct value for either. The practical choice is between a simpler setting and one that lets you account for differences between cores.
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| Setting approach | Trade-off | When it may fit |
|---|---|---|
| All-core | Simpler to configure and evaluate, but applies a common approach across cores. | When simplicity is the priority and the system remains stable under your actual workloads. |
| Per-core | More involved to tune, but lets you account for weaker cores that may not tolerate the same offset as others. | When all-core tuning produces instability and you are prepared to test cores and workloads carefully. |
What should you record to diagnose the result?
Ryzen Master can show real-time per-core clock rates, temperature and voltages, and can manage PBO and Curve Optimizer on the fly or through BIOS. Record comparable readings before and after changing one setting at a time.
- Whether the CO value remains after reboot.
- Idle temperature and sustained temperature during the same workload.
- Package power and per-core clocks, including effective clocks where available.
- Whether the workload completes without crashes, restarts, application errors or corrected hardware errors.
If the value is missing after reboot, investigate persistence. If it remains and the curve is active but temperature is still high, use the power, clock and cooling readings to narrow down the cause rather than assuming the undervolt did not apply.
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