Take a look at our
ThinkPads.com HOME PAGE
For those who might want to contribute to the blog, start here: Editors Alley Topic
Then contact Bill with a Private Message

T420s always underclocked

T400/410/420 and T500/510/520 series specific matters only
Post Reply
Message
Author
josh5k
Posts: 18
Joined: Fri Mar 01, 2013 8:46 am
Location: Bangalore, India

T420s always underclocked

#1 Post by josh5k » Sat Sep 12, 2015 8:28 am

I upgraded my T420s from Windows 7 to Windows 10 at launch and for the last few days it always seems to be underclocked even on full load. I tried exporting a bunch of images from lightroom and the CPU is at 0.78 Ghz throughout. Restarts, Drivers checks and Clean boots don't seem to have an effect. It's just stuck there. Any ideas?
T430 - (2349-7N7) i5 3320M, 8GB RAM, 256GB SSD, 1600x900, 10 10 Pro 64-bit
T420s - (4170-RM4) i5 2520M, 12GB RAM, 128GB SSD, 1600x900, Win 10 Pro 64-bit
R400 - (7440-CN1) P8400, 2GB RAM, 500GB HDD, 14.1" 1280x800
T30 - (2366-QA7) P4 M 1.8 GHz, 1GB RAM, 40 GB HDD, 1400x1050, Win XP SP3

Hans Gruber
Senior Member
Senior Member
Posts: 815
Joined: Thu Sep 29, 2005 6:18 am
Location: Seattle, WA

Re: T420s always underclocked

#2 Post by Hans Gruber » Sat Sep 12, 2015 9:45 am

Chnage your profile to maximum performance and see if the CPU clock speed doesn't dip in speed as much. It will run much warmer with constant higher clock speeds.
:beer: T43p,T61,X200,X200s,x201,T500,W500,T510,T410,T410s,T420s,T430,T430s :parrot:

hhhd1
Senior Member
Senior Member
Posts: 500
Joined: Mon Nov 17, 2014 7:23 pm
Location: Cairo, Egypt

Re: T420s always underclocked

#3 Post by hhhd1 » Sat Sep 12, 2015 9:45 am

Do you have both a working battery and a power adapter connected at the same time when this happens ?

Do you have nvidia ?
what is your power adapter rating, 90w or 65w ?
===

josh5k
Posts: 18
Joined: Fri Mar 01, 2013 8:46 am
Location: Bangalore, India

Re: T420s always underclocked

#4 Post by josh5k » Sat Sep 12, 2015 10:27 am

Hans Gruber wrote:Chnage your profile to maximum performance and see if the CPU clock speed doesn't dip in speed as much. It will run much warmer with constant higher clock speeds.
I just came back to take the post down, cos it was just the same. Moving to maximum performance brings the CPU back into the 2.3 to 2.53 Ghz change. looks like clean boot wasn't all that clean since the power manager was still booting in the background.

Thanks for the accurate step!

I'm still surprised that Maximum battery life would underclock constantly at 0.74 to 0.78 Ghz esp since it doesn't exactly increase battery life all that much.

Anyone manage to figure out the best settings to make the T420s usable as well as portable enough? Almost regretting choosing the 420s over the 420!
T430 - (2349-7N7) i5 3320M, 8GB RAM, 256GB SSD, 1600x900, 10 10 Pro 64-bit
T420s - (4170-RM4) i5 2520M, 12GB RAM, 128GB SSD, 1600x900, Win 10 Pro 64-bit
R400 - (7440-CN1) P8400, 2GB RAM, 500GB HDD, 14.1" 1280x800
T30 - (2366-QA7) P4 M 1.8 GHz, 1GB RAM, 40 GB HDD, 1400x1050, Win XP SP3

jaspen-meyer
Senior Member
Senior Member
Posts: 831
Joined: Wed May 19, 2010 11:21 pm
Location: Pardubice, Czech Republic
Contact:

Re: T420s always underclocked

#5 Post by jaspen-meyer » Sat Oct 10, 2015 3:16 pm

Running on a 65W adapter without a battery will also limit your cpu speed.
T420 i7 3612QM seabios; T420 i7 3630QM; T400 Q9100 seabios; T61 P9600; T60 libreboot; x62; x60s libreboot, led; x24 xiphmont led

Post Reply
  • Similar Topics
    Replies
    Views
    Last post

Return to “ThinkPad T400/410/420 and T500/510/520 Series”

Who is online

Users browsing this forum: No registered users and 6 guests