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

Intel T9900 undervolting with pinmod

T60/T61 series specific matters only
Post Reply
Message
Author
zoltan87
Sophomore Member
Posts: 171
Joined: Mon Oct 24, 2016 12:16 pm
Location: Plymouth, United Kingdom

Intel T9900 undervolting with pinmod

#1 Post by zoltan87 » Fri Nov 23, 2018 6:42 pm

So I managed to get an intel T9900 cpu to work in my T601 Frankenpad build. I used a small wire to connect B23 (BSEL [1]) to A20 (VCC) on the cpu socket. And the processor works perfectly in the laptop, although with lower max frequency (2.3 ghz instead of 3.06 ghz) because of the 800 mhz fsb (not 1066 mhz as the processor was designed for).

I don't mind the speed loss as the main reason for this upgrade was the lower power consumption and heat output. And here is my issue.
I can run the cpu on all multipliers on 0.900 volt perfectly stable, which is great. But that is the minimum allowed voltage, i can't go below that. So even if I change the voltage in CPUgenie (a program I use for undervolting) lower than 0.900 v, and it shows that lower voltage, the real cpu voltage won't go below 0.900 volt, I checked it with cpu-z.

There is a pin mod that should enable you to lower the voltages by 0.200 v if you connect AE3 (VID[4]) to the closest VCC, which is AD7. I tried to do this, but I had no success. I tried out multiple wires to make sure a damaged wire/ insufficient contact wasn't the problem, but I couldn't achieve the undervolt. In fact nothing happened.

The data sheet for the pinout is from March 2009 for 45 nm Core 2 cpus, so I don't think i got the pin locations wrong, and also the BSEL[1] pin mod has worked just fine allowing me to use this processor in my T601.

What could be the problem? Is it possible that the Intel T9900 have these VID[4] and VCC pins at a different location?

EDIT: Well, looks like my pin mod might have just worked, even though CPU-Z doesn't show it. Previously I could lower the voltage on the highest 11.5 multiplier to 0.9 volt, but now my laptop completely locks up if I do that. In fact the lowest stable voltage on that multiplier now is 1.1 volt, and that would be exactly 0.9 volt (1.1 - 0.2) if the undervolting pin mod was in effect.

Also the temperatures during stress test indicate a successful pin mod. So I just need to find an other program, that could read the real cpu voltages. Really looking forward to doing more tests tomorrow on all the multipliers.
Laptops after the 4:3 aspect ratio era are non-existent to me.

Screamer
Junior Member
Junior Member
Posts: 461
Joined: Sun Apr 15, 2018 7:15 am
Location: Singapore

Re: Intel T9900 undervolting with pinmod

#2 Post by Screamer » Sat Nov 24, 2018 4:27 am

The 800MT/s and 1066MT/s Socket P processors do not have any differences in regards to their pin-outs, as far as I know.

Unfortunately, there is no such program that reads the actual voltage input being fed to the processor. Although while CPU-Z is able to do this, it is only on certain laptops that has a sensor which reads the processor's voltage input. If that sensor is not found on the motherboard, CPU-Z will instead, use the 'Core VID' way of checking the processor's voltage input. This means the theoretical voltage reading, not the actual voltage reading (eg: VID is 1.450v, but you are getting 1.436v instead).

You would have to manually calculate, or refer to the voltage identification table to see how much voltage you are actually requesting.

EDIT: I think I was a little unclear, since there are programs that do read the processor's voltage input (SpeedFan). This is done by reading one of the registers found on the SuperIO chip, but SpeedFan and CPU-Z apparently do not have any support for most of the SuperIO chips found on the ThinkPad line.

storm-chaser
Sophomore Member
Posts: 140
Joined: Fri Aug 19, 2011 6:46 pm
Location: Schenectady, NY

Re: Intel T9900 undervolting with pinmod

#3 Post by storm-chaser » Wed Dec 05, 2018 7:11 pm

Have you tried ThrottleStop for voltage adjustments? I don't recall if that would work for undervolting, but it might be worth a shot.
AMD Phenom II 965 @ 4.1Ghz, 8GB DDR3 1600, SSD
AMD Phenom II 960T @ 4.1Ghz, 8GB DDR3 1600, SSD
Lenovo T61p 15.4" - Core 2 extreme X9000 CPU @ 3.4Ghz, SSD
Toshiba Satellite A505D - 2.5Ghz, 4GB RAM, 80GB SSD

zoltan87
Sophomore Member
Posts: 171
Joined: Mon Oct 24, 2016 12:16 pm
Location: Plymouth, United Kingdom

Re: Intel T9900 undervolting with pinmod

#4 Post by zoltan87 » Wed Dec 05, 2018 8:39 pm

storm-chaser wrote:
Wed Dec 05, 2018 7:11 pm
Have you tried ThrottleStop for voltage adjustments? I don't recall if that would work for undervolting, but it might be worth a shot.
It turned out that my undervolting with pin mod has succeeded, the stress tests prove it. So even though I can't see the real voltages, I know that they are in effect. because of the lower temperatures I have.

An other way of knowing, if I change the voltage from 1.1 v to 1.112 v in CPUGenie, then I get an about 13 degrees temp rise in the stress test. That's because of this pin mod all the voltages between 0.9125 v and 1.1000 v are unavailable. So if I set the voltage to 1.1, then my real voltage is 1.1-0.2=0.9 v, but if I set it to 1.112, then I will get 1.112 v (as 1.112-0.2=0.912 v is unavailable).

Here are the voltages I use with the T9900 in my T601 build:

Multiplier----Voltage in CPUGenie-------------Real voltage (that I can't see)
x6(super LFM)--0.9 (hard limit of the cpu)--0.7
x6----------------0.937---------------------------0.737
x6.5-------------0.95-----------------------------0.75
x7---------------0.962----------------------------0.762

(etc.)

x11.5----------1.1-------------------------------0.9

I also used a small program that calculates the TDP of processors, if you know the original (design) TDP value, original voltage and frequency, adjusted voltage and adjusted frequency. My T9900 processor with the new values has an 18 Watt TDP, so effectively I have an ULV processor in my Frankenpad :).

EDIT: If anyone is interested, here is a link for the pin mod, where I red about it first:

http://forum.notebookreview.com/threads ... -2.365230/
Laptops after the 4:3 aspect ratio era are non-existent to me.

Lister
Freshman Member
Posts: 53
Joined: Tue Jul 28, 2015 11:35 am
Location: Czech Republic

Re: Intel T9900 undervolting with pinmod

#5 Post by Lister » Wed Dec 12, 2018 3:51 am

Hi,
what are the temperatures in IDLE and the load and at what fan speed? I use the 32bit Windows most often for testing system, IBM_ECW is working well, which I use to undervolting the CPU. Do you use a nvidia or Intel graphics card? TDP 18W looks great :D, I'm waiting now for the P9700 processor. 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

Post Reply
  • Similar Topics
    Replies
    Views
    Last post

Return to “ThinkPad T6x Series”

Who is online

Users browsing this forum: No registered users and 15 guests