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T61 nV GPU voltage

T60/T61 series specific matters only
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Lister
Posts: 48
Joined: Tue Jul 28, 2015 11:35 am
Location: Czech Republic

T61 nV GPU voltage

#1 Post by Lister » Sun Feb 03, 2019 4:42 am

Hlleo everyone,
on the weekend I made a pin-mod on the T61(FRU 42W7649) with nvidia NVS 140m graphics card and installed the CPU P9700. Everything is up and running good, but now I can not undervolted GPU. It still works at the factory voltage, used BIOS from Highsun with 0.95V voltage. I want to ask, did anyone have a similar problem? When reflashed BIOS from Highsun again, GPU-Z show voltage between 1.15V and 1.2V and Aida64 show 0.95V. Temps in idle are around 45°C for both. Which voltage may be correct?

Thanks.
IBM T601f | UXGA AFFS | T9900 | 965GM | Samsung 8GB | Samsung 850 Pro 1TB
IBM T601f | UXGA AFFS | T9900 | NVS 140m | Patriot 8GB | Micron C400 512GB

Screamer
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Joined: Sun Apr 15, 2018 7:15 am
Location: Singapore

Re: T61 nV GPU voltage

#2 Post by Screamer » Sun Feb 03, 2019 5:38 am

AIDA64's graphics chip voltage report seems to be correct, as far as I know.

According to my experience, GPU-Z seems to only report the stock voltage that your graphics chip runs at, not the currently set voltage. I've noticed that by undervolting a desktop graphics card with MSI Afterburner, and GPU-Z did not respond to the voltage changes. MSI Afterburner did, however.

I am very sure that AIDA64 is reporting the correct voltage, no doubt.

Lister
Posts: 48
Joined: Tue Jul 28, 2015 11:35 am
Location: Czech Republic

Re: T61 nV GPU voltage

#3 Post by Lister » Sun Feb 03, 2019 9:08 am

So I made measurements in other programs. HWInfo displays the same values as GPU-Z (1.15-1.2V), Nvidia Inspector displays the same values as Aida (0.95V). I've also run several benchmarks GPU and temperatures are to 60°C at full load and 2500rpm fan. So it will be how Screamer writes. The GPU is undervolted, but someone SW reads incorrect values. Thanks.
IBM T601f | UXGA AFFS | T9900 | 965GM | Samsung 8GB | Samsung 850 Pro 1TB
IBM T601f | UXGA AFFS | T9900 | NVS 140m | Patriot 8GB | Micron C400 512GB

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