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ThrottleStop undervolt is great, how to make it even better (Lenovo T480 Intel Core i5-8350U @1.9ghz)

Natcuber said:
Overclocking the GPU? Boy that is tempting. I'll hold off for now, since my temps aren't that great in the first place, and it's risky.
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it's not as risky as you might think. essentially you can almost always reprogramm the bios. even if you lose your backup you can get a dump on badcaps forum. it's rather questionable if all this effort is worth anything.
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Natcuber said:
So you think it's the speed shift that's causing this?
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It is mostly lack of voltage causing your computer to crash. A successful undervolt is one where you can switch to battery power or plug your laptop in without it crashing. If your computer crashes when you switch power sources then your undervolt is not 100% stable. Many 8th Gen U series CPUs are not 100% stable beyond about -70 mV. If you do not want your computer to randomly crash, increase the voltage.
 
Natcuber said:
So you think it's the speed shift that's causing this?
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The undervoltage capacity in the voltage x clock curve is not homogeneous.

At some points it is possible to reduce the tension further and at others it is necessary to be more conservative.

With Speedshift at 0 the processor will keep the clock as high as possible even under light loads and this can benefit the undervolt by allowing greater undervoltage.

Generally at very low clocks (or very high clocks on CPUs with very high maximum clocks) the undervolt should be more conservative.

The higher the Speedshift value, the more the clock will vary, reaching low numbers and during the split second of switching between profiles the system becomes unstable.

As Throttlestop treats the entire curve equally, if you want a completely stable undervolt at high Speedshift values you must increase the voltage.

I usually handle this using 3 profiles.

1- High performance profile:
Speedshift at 0 and highest possible undervoltage (stable only with Speedshift at 0)

2- Balanced profile (connected): Speedshift at 84 and stable under voltage

3- Economy profile (battery): Speedshift at 153 and under voltage a little more conservative than in profile 2

When connected to power, profile 2 is selected and when on battery, profile 3.

I change profile 1 manually, always going from 2 to 1 or from 1 to 2 to avoid instability.
 
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Natcuber said:
Overclocking the GPU? Boy that is tempting. I'll hold off for now, since my temps aren't that great in the first place, and it's risky.
Click to expand...
My guess would be that you can increase fan speed on average or even maximum fanspeed and increase tdp of the system that way.
 
x3oo said:
My guess would be that you can increase fan speed on average or even maximum fanspeed and increase tdp of the system that way.
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Already done.
 
Natcuber said:
I used tpfancontrol.
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can you link which version you're using? i download this a few days ago and it didn't seem to work
also
on my x230 i could set the fan to an unregulated maximum speed in linux, which was faster than the regulated maximum speed. When playing with bios you can sometimes notice the fan going to a very loud maximum speed on my x380 too. would be nice to unlock it.
 
x3oo said:
can you link which version you're using? i download this a few days ago and it didn't seem to work
also
on my x230 i could set the fan to an unregulated maximum speed in linux, which was faster than the regulated maximum speed. When playing with bios you can sometimes notice the fan going to a very loud maximum speed on my x380 too. would be nice to unlock it.
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I got TPFancontrol 0.63 from this website. https://thinkwiki.de/TPFanControl
I let the fan run at that max emergency speed of 64 (which my it never reaches without tpfc) whenever needed.
 
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