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Ryzen 3600 idle temperature fluctuation?

 
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post #1 of 4 (permalink) Old 10-29-2019, 12:52 PM - Thread Starter
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Ryzen 3600 idle temperature fluctuation?

GPU: 5700 XT Gigabyte Gaming OC

CPU: Ryzen 3600

CPU cooler: Scythe Mugen 5 rev.b

Motherboard: MSI B450M Mortar Max

RAM: Patriot Viper Steel 3600mhz CL17

PSU: Corsair RMx 850

Operating System & Version: Windows 10 64 bit

GPU Drivers: Newest drivers as of date.

Chipset Drivers: Newest as of date

BIOS: Newest as of date

Background Applications: Idle, Chrome with 20-30 tabs.

PC cooling: 2x140 in front at 1200 rpm when CPU climb at max temps, 2x120 rear and rear-top with 1200 rpm.

Case: Meshify C



Seriously how to make this CPU *NOT* constantly downclock/upclock, and change the temperature rapidly. Like my old I5 4670 had way better frequency control, power saving, and didn't jump in temperatures constantly. Is there any way to stop that? Any BIOS/software setting? I have sufficient cooling with Mugen 5 rev b and kryonaut, getting max 67-70 degree at furmark CPU/AIDA FPU tests, so cooling is not a problem. I've even repasted CPU with different paste[the one that came with Mugen 5 rev b], saw a temp. increase over kryonaut, but the fluctuations/spikes persisted as before.So this fluctuations completely destroys any fan curve, and make my case fans too loud on idle. I've thought on tying the fan speed with MOBO mosfet temps instead of CPU, but they hardly climb with how good MSI B450M mortar max manages the stock ryzen.I've tried to make a higher baseline RPM curve for lower temps, so it have more than enough cooling in low temps to manage the spikes, but it didnt help anything...I didn't try to change the step-up/step-down times[its basically hysteresis/inertia right?], maybe that will fix it? Though i doubt it, because it would need to be something like 1-2s of inertia, and there's no such value in BIOS. As a last resort i will try to use the stock cooler and check if it helps. Maybe the mugen is defective? But then, why it works under heavy load? If there was something funky with contact between IHS and mugen heat plate, it would make the temps skyrocket under prime95/aida fpu.

CPU sits 34*C idle at the windows desktop[32 at bios], when you move mouse it goes to 43-44*c, when you open chrome it can sometimes go to 50*C, and opening the chrome with lots of tabs it can go even as high as 59-60*C!!!. The frequency on all cores don't drop below 3600 mhz, and 1.0V, slightly moving mouse and bam you have 1,3-1,4V and 4,2GHz on desktop, same for chrome.

im pretty pissed after moving from a I5 4670 with a lousy stock cooler that run flawlessly, compared to this. I've never had such problems with Intel Pentium 4, E8400 and I5 4670. Never seen 10*C-15*C jumps in idle, or 20-25*C jumps when opening chrome with CoreTemp monitoring program along. Never seen CPU running such high freq and voltage on idle.[the i5 4670 runs 0,7v -0,8ghz on idle, and even if the frequency and voltage jumps for a fraction, the temperature increase is not that much[5-8*C, with chrome its 10-12*C], whereas ryzen runs 3,6ghz 1,0v all the time on idle. This also badly impact environement and my bills, since its wasted electricity.

Question is, i heard people talking about enabling/disabling cool and quiet, enabling/disabling power supply idle control, enabling/disabling PBO,setting P-states, manually overclocking/setting cores on the CPU to remedy this problem. So which one to do to fix the problem? I don't want to test all these settings, and screw something. Is there really no way to change it? I can't imagine a 2019 CPU needs to run its clocks at 3,2-3,6ghz at idle, to manage mundane tasks, when my old Haswell I5 4670, downlocked to 0,8GHz!!![and upclocked to 3,6 GHz when necessary!], and still run chrome/idle fine, with great temperatures[albeit i had 60hz monitor back then, idk if that changes anything, i doubt]
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post #2 of 4 (permalink) Old 10-29-2019, 01:11 PM
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That is how Zen2 works, and Zen+ also behaved in the same manner. Remember you have a CPU on a very small 7nm process (much smaller than your old i5 4670), and with 6 core/12 thread, this means a lot of heat gets generated as soon as any core is loaded, and that gives those very fast temperature fluctuations compared to a CPU with a larger DIE size (larger nm), a CPU with a larger DIE has a larger surface to dissipate it's heat into, an therefore the spikes are much smoother compared to a small DIE than hasn't got a lot of surface to dissipate it's heat through - it will get hotter much faster. Think of it like you have a cookin plate that is 20cm in diameter and another thats only 10cm in diameter. The smaller plate will reach 100 degrees celcius much faster than the larger one.
I have a Core i7 5960X 8 core /16 thread and a Core i7 6950X 10 core / 20 thread CPU, and both of these only idle to around 1200MHz when nothing is touched in windows. As soon as I move the mouse or work on a document the CPU runs at least 2.8GHz or 3.0GHz. I also have a Ryzen 9 3900X and it behaves just like your 3600 and my two other Intel CPU's. The CPU adjusts the speeds to the task at hand and also the tasks running in the background, so the CPU runs any where from 3.5 to 4.4GHz depending on the load and load per core.

As for the fan speeds and the fluctuations here, you should be able to set a delay in the BIOS so the fans won't ramp up and down as the temperature jumps. If you completely want to avoid this jumping up and down in the fan speed, then set a custom fan curve (I did) for your fans. E.g let them run at a fixed speed between 20 and 60 degrees celcus and only when the CPU goes over 60 degrees celcius the fan speed will increase further. In this way your ear wont hear a whooosh noise everything the fans jump up and down when bound to a specifc temperature and short intervals.

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post #3 of 4 (permalink) Old 10-29-2019, 01:16 PM
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My temp fluctuations dropped a with PBO on upping black and going from auto volts to minus 100MV.
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post #4 of 4 (permalink) Old 10-29-2019, 01:25 PM
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Quote: Originally Posted by Hokies83 View Post
My temp fluctuations dropped a with PBO on upping black and going from auto volts to minus 100MV.
That is because PBO lets the CPU keep it's boost state for a longer period. This also translates into less fluctuation in speed. At best it will allow the CPU to maintain boost clocks longer and more often, and therefore PBO will have the strongest effect on scenarios where the CPU is already able to boost. Because one of the constraints is thermal, PBO will also have less effect on CPUs that are already well-cooled and not bumping up against that limit.

[Official] Corsair Vengeance C70 Gaming Case Owner Club
Polar Claw
(19 items)
Arkbird
(15 items)
CPU
Intel Core i7 6950X [email protected]
Motherboard
MSI X99S SLI Krait Edition
GPU
MSI RTX 2080Ti Duke OCV1 & Inno3D RTX 2080Ti Gaming OC X3 NVlink-SLi @1450/1838MHz
RAM
32GB HyperX Savage [email protected] DDR4 CL13
Hard Drive
Intel SSD 330 Series 120G SSD
Hard Drive
Kingston SSD Now V300 240GB SSD
Hard Drive
Kingston V-series Gen2 64GB SSD
Hard Drive
Samsung SpinPoint F1 640GB
Hard Drive
Seagate Barracuda 7200.12 750GB
Optical Drive
Samsung SH-S203D DVD-Rom
Power Supply
Thermaltake Toughpower 1500w
Cooling
Phanteks PH TC-14PE
Case
Corsair Vengeance C70 Artic White
Operating System
Windows 10 Home Premium 64bit
Monitor
Acer XF270HUA 27" TFT 2560x1440, 144Hz, IPS, 4ms
Keyboard
Microsoft Sidewinder X6
Mouse
Logitech G9X
Mouse
Steelseries Steelpad 4D
Audio
Onboard Realtek HD
CPU
Intel Core i7 5960X [email protected]
Motherboard
MSI X99S Gaming 7
GPU
MSI RTX 2080 Duke OCV1 & Palit RTX 2080 GamingPro OC NVlink-SLi @1615/1875MHz
RAM
32GB (4x8GB) Corsair Vengeance LPX 2666MHz CL15-17-17-35 2T, 1.2v
Hard Drive
Kingston V300 120GB SSD
Hard Drive
Western Digital Black 500GB, 7200RPM, 8MB cache HDD
Optical Drive
ASUS DRW 24F1ST DVD±RW
Power Supply
Fractal Design Newton R3 1000watt 80+ Platinum White
Cooling
Arctic Liquid Freezer 120
Case
Aerocool XPredator X3 White
Operating System
Windows 10 Home Premium 64Bit
Monitor
AOC Q3279VWF 31.5" TFT, [email protected] 5ms
Keyboard
Kingston HyperX Alloy FPS
Mouse
Logitech G5 Star Wars edition
Audio
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