Surprising defect of thinkpad X61

Surprising defect of thinkpad X61:
Here is the test procedure:
set X61 power scheme to be Maximum performance and always use AC adapter.
Download Intel® Processor Identification Utility to test the CPU (T7500, 2.2G) of my thinkpad X61.
Here is the download link: http://support.intel.com/support/processors/tools/piu/sb/cs-014921.htm
Core 1 and Core 2 frequencies of T7500 are 2.2G when battery is installed even AC adapter unplugedd.
Core 1 and Core 2 frequencies of T7500 are dropped to be 1.19G and system bus frequency is dropped from 800 M to be 797 M when battery is removed !!
I tested another X61 of my friend, the CPU is T7300 (2G).
Core 1 and Core 2 frequencies of T7300 are also dropped to be 1.19G and system bus frequency is also dropped from 800 M to be 797 M when battery is removed !!
Furthermore, I tested a X60 of my friend, It does not have the defect !!

My thinkpad X61 (CPU: T7500 2.2G, 4M L2 cache, 800m FSB; RAM: Hynix 2G DDR2 P5300 667M 200 pin SODIMM, I added a Transcend 2G RAM stick; Hard drive: 160G 7200 RPM, 8 cell Li battery).

 

Welcome to the forums.

The multiplier drops to 6x (200x6=1200MHz) when there is little load on the system, regardless of power state. It is also normal for the FSB to fluctuate up or down about 5MHz, this happens on every machine.

 

Man: Hey doc....my arm hurts when I move it like this.

Doctor: Then don't move it like that.

 

I even upgraded the BIOS and tried to reset the settings in power management of the BIOS, but nothing happened.

I think maybe This 65W Adapter may not be adequate to run the chip at max. clock speed.

I used a software : super_pi_mod-1.5 ( http://www.xtremesystems.com/pi/) to test the CPU speed.

1M digits: with battery installed: 20 seconds, without battery installed: 40 seconds

 

This is a well known condition with quite a few modern notebooks. You can't do anything about it because it isn't a design issue. The manufacturers want you to have the battery installed for many good reasons.

 

Its not a defect to have the FSB fluctuate by +- 5Mhz.

 

You need to do quite a bit more messing around with Lenovo and Windows power settings before you declare this to be a system flaw. I wouldn't stop there either -- mess around with RightMark CPU utility (only if you know what you're doing!) if you really want to be control of your CPU speeds when on battery or even plugged in. You do not need or want your laptop running at full bore all the time, especially when on battery. It unnecessarily taxes the processor, heats up your computer and drains battery life. I have a 2.5 GHz processor (T9300 C2D in a T61p) that I run at 600MHz running on battery, and on variable speed when plugged in. Having your processor on a variable speed setting is fine when plugged in. When you are not, there is no inherent problem with your laptop clocking down. If you simply must have your processor running at full blast all the time (I can't imagine why), try using RightMark software. If you can't get it to clock how you want it then, you have indeed found a real BIOS design problem. I doubt it though.