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Throttlestop limiting cpu wattage to 10 watts

Joined
Aug 27, 2023
Messages
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System Name Thinkpad x1 carbon 7th gen
Processor Intel core i7-8565u
Memory 16gb ddr3
Video Card(s) intel UHD 620
Hello everyone, I have recently downloaded Throttlestop to fix the seemingly random CPU wattage drops down to 5 watts which turned out to be weird thermal throttling(image attached) which according to some posts here turned out to be an easy fix by disabling BD-PROCHOT and locking PROCHOT offset. After fixing, I added 15 watts power limit, and disabled turbo and short power PL2 to get constant performance. It ran fine for some time until recently I noticed that the CPU would be locked at 10-11 watts even though the limit was 15 watts. I ran multiple benchmarks and it still wouldn't exceed the "invisible" 10 watt power limit. I changed every setting I could, even deleted lenovo software, thinking it was the issue, but later found out that the limit wasn't there when throttlestop wasn't running. Throttlestop also reported some limits in yellow but I don't understand what they mean. I also have not changed any voltages in FIVR, so underclocking is not the issue. Does anyone know what is going on and how do I fix it?
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Solution
Checking Disable Turbo is causing this problem. This is forcing your CPU to run at less than half of its rated speed. When limited to 1800 MHz, even when fully loaded, it only needs to consume 10W or 11W of power. Let your CPU run faster if you want it to consume more power.

I would clear the Disable Turbo box. If the Turbo Ratios in the FIVR window are not locked, lower the turbo ratios to control the maximum CPU speed. If these are locked, open the TPL window and lower the Speed Shift Max value to control the maximum CPU speed. Use one method or the other. No need to use both methods at the same time. Instead of 18, you could try using 24 so your CPU is not quite so slow.

To set your power limits properly, when using MMIO Lock, do...

unclewebb

ThrottleStop & RealTemp Author
Joined
Jun 1, 2008
Messages
8,137 (1.33/day)
Checking Disable Turbo is causing this problem. This is forcing your CPU to run at less than half of its rated speed. When limited to 1800 MHz, even when fully loaded, it only needs to consume 10W or 11W of power. Let your CPU run faster if you want it to consume more power.

I would clear the Disable Turbo box. If the Turbo Ratios in the FIVR window are not locked, lower the turbo ratios to control the maximum CPU speed. If these are locked, open the TPL window and lower the Speed Shift Max value to control the maximum CPU speed. Use one method or the other. No need to use both methods at the same time. Instead of 18, you could try using 24 so your CPU is not quite so slow.

To set your power limits properly, when using MMIO Lock, do not check the Sync MMIO box. Check both Long Power PL1 and check Short Power PL2. Set both power limits to 15 if that is what you want. Check both Clamp boxes to prevent your CPU from exceeding 15W.

These settings are killing performance but if the reduced fan noise and heat makes you happy then these settings are great for you. A better idea would be to clean out your laptop and try to improve the cooling.

The CORE column in Limit Reasons is the important column. If Thermal Velocity Boost is checked in the FIVR window, you will get TVB throttling showing up in the Limit Reasons window at approximately 65°C to 70°C.

Clearing the BD PROCHOT box on the main screen of ThrottleStop should fix BD PROCHOT throttling.

Improved cooling and locking PROCHOT Offset will help fix THERMAL throttling.

PL1 and PL2 throttling is being caused by you setting the turbo power limits to only 15W. Whenever any of these throttling reasons are triggered, it is normal to see EDP throttling light up red under the RING column at the exact same time.
 
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