Is this method compatible with mac ? I mean, all the presets configured are saved in someway that next boot with mac os could work?

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Would you be so kind and added how to setup Windows as well?

Example:
- room temperature
- clean install
- latest BIOS/updates/drivers/firmware
- BIOS setup
- Windows Energy settings (Balanced vs High Performance)
- disable other programs or virus scanners?

These all could have an effect on the benchmark results.

My brand new Lenovo ThinkPad X1 Extreme (i7-8750H, 32GB RAM, 1x 2TB Samsung 970 EVO) only delivers the following rather disappointing results.

Cinebench 15 x64, Windows 10 Pro x64
- factory settings (stock) ~840 points
- clean re-install (stock): ~860 points
- clean re-install (XTU undervolted) ~1010 points
NotebookCheck squeezed out over 1200 points when undervolted...

Intel XTU settings
-0.155 mAh, 57Watt (sustain), 78Watt (peak)

I have msi gf72vr and i found safe undervolt at -125mV but when i unplug the charger the laptop freezes. I changed the undervolt to -110 and now I do not have the same problem but the temperature is going to 84 degree. When it is -125 it goes to 81 degree maximum. Is there a way to fix this freeze and to still leave the undervolt to -125mV ?

When I used XTU to undervolt yesterday my temperature drop down but the problem is when I shut down my laptop and then after a few hours I open it the voltage returns to default. What will be the solution to that?

Thanks for the guide, but when i try to udervolting my i7-6700HQ (2.60GHz) on my HP OMEN 15 a scary message appears advising that on my computer Watchdog coverage is currently unavailable.

Actually, it is a very useful feature, in fact, When watchdog coverage is enabled and your system crashes, your computer can reboot automatically and notify Intel XTU to revert to a stable state. Having this feature helps avoid the cases where new hardware settings are so unstable that the computer cannot even load the operating system or execute applications properly.

So, someone can suggest me how to install or enable it? Because there is a post about the same identical problem (and computer) in the Intel forum, but without a real solution.
thanks

would any change persist if the XTU program is closed?

Great guide. Thank you!

Thanks, @craig. Really useful guide!

I noticed that everytime Intel max turbo was activated my DELL G7 CPU (Intel 8750H) got really hot (96-99ºC). Since the internal coolers are unable to chill it fast enough, the CPU suffered thermal throttling (Temp>98ºC) to avoid damage and so its frequency got lowered to 3.30-3.40GHz for some good seconds here and then.

I started undervolting (XTU) it on -0.01V increments and checked that -0.150V was the maximum with no system failure (4 days up and counting, sir) and this way I was able to eliminate thermal throttling and improving performance in Passmark CPU mark (+5%) and Cinebench CPU (+15%).

For my use, in the place I live (sunny Brazil), I also decided to turn the CPU turbo max mode off, because it caused CPU to often suffer power throttling and the average CPU frequency over a 30-60 minutes stress was lower (3.60GHz) than the average CPU frequency with turbo max off (3.80GHz). I tried to lower the max TDP to 55W, got better average performance than with factory 78W, but still worst than turning if off.

I stress the CPU for +-30min with Passmark CPU very long duration complete test, 5 iterations. After tweaking, no more thermal throttling =) but still some power throttling =/ .

If somebody else has tweaked his/her G7, could please share which voltage and TDP limit values used?

Thanks.
Mario Estolano.

Even if I didn't look up this guide until after I'd undervolted my CPU ( ::) ), it was still great to confirm my assumptions and have everything verified in a thorough manner. Thanks for a great guide!

Also, either your average UV numbers (-0,060 to -0,080V for KBL) are conservative, or there's really something to Intel's binning process: my i7-7600U happily runs both CPU, Cache and iGPU at -0,100V. 0,110 causes crashes, but 0,100 is stable after 6 hours of Prime95/3 hours of 3DMark looping. Good enough for me.

Also, the UV gave me a 10% increase in Cinebench scores, and generally allows for significantly higher boost clocks - around 3-400MHz in the XTU Stress Test, at no change or a minor reduction in temperatures. Not bad at all for maybe 20 minutes of actual effort.


Will: yes, it seems that core and cache voltages are either linked or XTU treats them as linked (makes sense as cache clocks are sort of linked to CPU clocks). Adjusting one adjusts the other, at least for me.

What kind of graphics stress test are you running? Something reasonable (3DMark, Unigine Heaven or Superposition), or a power virus like FurMark or MSI Kombustor? The latter will at least tend towards making things crash "unrealistically", i.e. inducing loads you'll never, ever see in real-world usage. On paper, undervolting the CPU shouldn't affect GPU tests at all, but of course the CPU will always be active feeding the GPU data, so there's probably some correlation there. I'd try stepping back the voltage a few steps and redoing the GPU stress test until stable - though unless you game on your ultrabook (or require absolute 100% stability), you're probably okay leaving it at -0,110V.

Hi, I'm having difficulty with my underclocking with XTU. I have an X1 Carbon 2017 and I've ran a 9+ hour stress test after a -0.110V core voltage adjustment with no issues. I wanted to adjust the cache voltage as well but it seems to be linked with the core voltage. Is this normal?

Also, running a graphics stress test causes a "reference_by_pointer" BSOD when I change the core voltage but there is no error at default settings. Should I reduce the core voltage change then? Thank you.

You would expect a reduction in battery life from overclocking. The potential battery life changes mentioned in this article are as a result of the slightly lower power draw on a system that has been undervolted.

Has anyone experienced any battery life changes as a result of overclocking?