부스트 클럭 개념이 생기고, 부스트 클럭이 무한대로 유지되지 않기 때문에 Power Limit이 도입된 것으로 알고 있습니다. 발열 한계 시점에 발동하겠죠?
PL1 (파워리밋 1단계)는 베이스 클럭(평상시) 단계에서 발동하고, PL2 PL3 PL4는 부스트 클럭때문에 발열이 한계점에 다다랐을 때 발동할 텐데… CPU든 메인보드에서든 알아서 해주면 좋겠지만 메인보드 제조사 커스터마이징 때문에 틀어지는 경우도 많은 것 같습니다.
웹문서 환경이 좋아진 덕분인지 인텔 공식 문서로 PL1 PL2 PL3 PL4 가이드 배포하는 것을 찾았는데요,
사라질 것을 대비해서 복붙 + 코멘트 약간 더해 둡니다.
Package Power Control
The package power control settings of PL1, PL2, PL3, PL4, and Tau allow the designer to configure Intel® Turbo Boost Technology 2.0 to match the platform power delivery and package thermal solution limitations.
- Power Limit 1 (PL1) : A threshold for average power that will not exceed – recommend to set to equal Processor Base Power (a.k.a TDP). PL1 should not be set higher than thermal solution cooling limits.
- Power Limit 2 (PL2) : A threshold that if exceeded, the PL2 rapid power limiting algorithms will attempt to limit the spike above PL2.
- Power Limit 3 (PL3) : A threshold that if exceeded, the PL3 rapid power limiting algorithms will attempt to limit the duty cycle of spikes above PL3 by reactively limiting frequency. This is an optional setting
- Power Limit 4 (PL4) : A limit that will not be exceeded, the PL4 power limiting algorithms will preemptively limit frequency to prevent spikes above PL4.
- Turbo Time Parameter (Tau) : An averaging constant used for PL1 exponential weighted moving average (EWMA) power calculation.
Notes:
- Implementation of Intel® Turbo Boost Technology 2.0 only requires configuring PL1, PL1, Tau and PL2.
- PL3 and PL4 are disabled by default.
- The Intel Dynamic Tuning (DTT) is recommended for performance improvement in mobile platforms. Dynamic Tuning is configured by system manufacturers dynamically optimizing the processor power based on the current platform thermal and power delivery conditions. Contact Intel Representatives for enabling details.
※ 코멘트 : PL1은 TDP와 일치시키는 것이 좋고, PL1 Tau는 최대 100초까지. PsysPL1 Tau는 뭘까요? 그림에 나와 있는데.
▲ 위 문서에 Psys (Platform Power)에 대한 설명 + 추천이 나와 있는 것 같습니다.
그래서 PsysPL1 ~ PsysPL4에 대한 내용도 복붙해 놓겠습니다. 아래 소제목을 보세요.
Platform Power Control
The processor introduces Psys (Platform Power) to enhance processor power management. The Psys signal needs to be sourced from a compatible charger circuit and routed to the IMVP9 (voltage regulator). This signal will provide the total thermally relevant platform power consumption (processor and rest of platform) via SVID to the processor.
When the Psys signal is properly implemented, the system designer can utilize the package power control settings of PsysPL1, PsysPL1 Tau, PsysPL2, and PsysPL3 for additional manageability to match the platform power delivery and platform thermal solution limitations for Intel® Turbo Boost Technology 2.0. The operation of the PsysPL1, PsysPL1 Tau, PsysPL2 and PsysPL3 are analogous to the processor power limits described in Package Power Control.
- Platform Power Limit 1 (PsysPL1): A threshold for average platform power that will not be exceeded – recommend to set to equal platform thermal capability.
- Platform Power Limit 2 (PsysPL2): A threshold that if exceeded, the PsysPL2 rapid power limiting algorithms will attempt to limit the spikes above PsysPL2.
- Platform Power Limit 3 (PsysPL3): A threshold that if exceeded, the PsysPL3 rapid power limiting algorithms will attempt to limit the duty cycle of spikes above PsysPL3 by reactively limiting frequency.
- PsysPL1 Tau: An averaging constant used for PsysPL1 exponential weighted moving average (EWMA) power calculation.
- The Psys signal and associated power limits / Tau are optional for the system designer and disabled by default.
- The Psys data will not include power consumption for charging.
- The Intel Dynamic Tuning (DTT) is recommended for performance improvement in mobile platforms. Dynamic Tuning is configured by system manufacturers dynamically optimizing the processor power based on the current platform thermal and power delivery conditions. Contact Intel Representatives for enabling details.
※ 코멘트 : 바이오스에서 Platform PL1 관련 설정이 보이면 Platform Power Control에 관련된 것이라고 보면 되겠습니다.
저는 인텔 N100 미니 PC를 구입하면서 발열 억제를 위해 PL1 PL2 값을 조작했는데, 아직도 개념을 잘 모르겠습니다. 잘 알고 계시면 댓글로 설명좀 해주시면 감사하겠습니다.
