2700X temperature with CPB enabled

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   I'm using Ryzen 2700X on X470 Master SLI(BIOS ver is 3.20).

When enabling "Core Performance Boost (CPB)", temperature of CPU changes like sawtooth wave (fig.1). Is this behavior normal?

fig.1 CPU temp with CPB ENABLED

fig.2 CPU temp with CPB DISABLED

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weekend7 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 16 May 2019 Status: Offline Points: 4	Post Options Post Reply Quote weekend7 Report Post Thanks(0) Quote Reply Topic: 2700X temperature with CPB enabled Posted: 16 May 2019 at 10:04pm
	I'm using Ryzen 2700X on X470 Master SLI(BIOS ver is 3.20). When enabling "Core Performance Boost (CPB)", temperature of CPU changes like sawtooth wave (fig.1). Is this behavior normal? fig.1 CPU temp with CPB ENABLED fig.2 CPU temp with CPB DISABLED

xhue Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 17 Aug 2018 Status: Offline Points: 634	Post Options Post Reply Quote xhue Report Post Thanks(0) Quote Reply Posted: 17 May 2019 at 12:26am
	What kind of work is your PC doing during both scenarios?

weekend7 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 16 May 2019 Status: Offline Points: 4	Post Options Post Reply Quote weekend7 Report Post Thanks(0) Quote Reply Posted: 17 May 2019 at 1:24am
	I didn't do any works during measuring the temperatures. PC was in IDLE state.

xhue Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 17 Aug 2018 Status: Offline Points: 634	Post Options Post Reply Quote xhue Report Post Thanks(0) Quote Reply Posted: 17 May 2019 at 1:26am
	Hmm, or so you thought. CPU/core/thread utilization + core clocks are also needed.

alander Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 14 Feb 2019 Status: Offline Points: 43	Post Options Post Reply Quote alander Report Post Thanks(0) Quote Reply Posted: 17 May 2019 at 2:16am
	That looks like it could be normal with CPB. I decided to just overclock my 2700x to around 4050 MHz on B450 Pro4 since that's what mine was normally when I ran it at default setting. I also didn't like seeing it at +1.45V even though it may only have been for a second and fine for short periods.

paologab Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 21 Nov 2018 Location: Milan Status: Offline Points: 112	Post Options Post Reply Quote paologab Report Post Thanks(0) Quote Reply Posted: 17 May 2019 at 3:08pm
	hi, in idle (or so supposed) I too I've the same behaviour.
	AMD Ryzen 7 2700X w/Wraith prism x470 Taichi bios 3.50 16gb HX432C16PB3K2/16 (hynix H5AN8G8NCJR-UHC) M.2 970 EVO, SATA SSD, 2 SATA HDD AMD Radeon RX 580 8G OC Linux Kernel 5.4 Manjaro Stable XFCE

gizmic Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 13 Jun 2018 Location: Hong Kong Status: Offline Points: 677	Post Options Post Reply Quote gizmic Report Post Thanks(0) Quote Reply Posted: 21 May 2019 at 3:20pm
	should be normal as its always trying to get the highest speed without crashing the system i think it would be clearer if you graph includes cpu speed and voltage


xhue Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 17 Aug 2018 Status: Offline Points: 634	Post Options Post Reply Quote xhue Report Post Thanks(0) Quote Reply Posted: 21 May 2019 at 3:55pm
	Why would it try to reach its max speed in idle?

gizmic Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 13 Jun 2018 Location: Hong Kong Status: Offline Points: 677	Post Options Post Reply Quote gizmic Report Post Thanks(0) Quote Reply Posted: 21 May 2019 at 9:57pm
	yes it will still try thats why the speed changes with or no load it will change speeds and voltage


xhue Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 17 Aug 2018 Status: Offline Points: 634	Post Options Post Reply Quote xhue Report Post Thanks(0) Quote Reply Posted: 21 May 2019 at 10:54pm
	My Ryzens and TRs (a couple of them) all have CnQ and CPB enabled. I see nothing like OP is posting. I'm idling at ~2GHz and there is no jigsaw temp pattern. I'm on different mobos, though.