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Old January 12, 2019, 05:17 PM
sswilson's Avatar
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Default Disadvantages to undervolting mobile processors?

Just completing the finishing touches on my poor man's gaming laptop (Dell G3) and finally got around to using XTU to play with the VCore offset and found that changing the offset to -.125 does indeed drop temps down enough to prevent thermal throttling under full load. (Dropped between 15 - 20C off of the max temps on my i5-8300H and seems to be keeping my max under full load to mid 80s).

I know some of our members have played with undervolting so I'm wondering if they've ever encountered a downside (aside from instability from going too low) to undervolting?

If not.... then anybody running a laptop should be checking for thermal throttling under stress testing and dropping their VCore offset down a few points using XTU.

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Last edited by sswilson; January 12, 2019 at 05:30 PM.
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Old January 12, 2019, 05:26 PM
Bond007's Avatar
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There are absolutely zero downsides as long as it is 100% stable. Lower power draw/heat at a fixed freq, or higher freq for the same power/heat. The factory voltage has a buffer to account for variances in silicone....you just have to play to figure out how much of that buffer you can remove on your specific cpu.

I have undervolted (and overclocked at the same time) every CPU I have owned in the last 8 years. My new laptop will just be an undervolt though, since it is locked.
Desktop: Arc Midi R2, Z77-D3H, 3770@4.1ghz with Zalman Optima Cooler, 4x4gb ram, EVGA GTX 1070 Ti SC, Bitfenix Fury 750w, WD Black 1TB, MX500 500gb
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Old January 12, 2019, 08:08 PM
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I think ThrottleStop is the recommended way to undervolt rather than XTU as I don't think it's officially supported on laptops.

But yeah, definitely the way to go, especially with gaming laptops.
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