Athlon XP 2600+ limited to 9.5 clock multiplier

[Guest]

I recently upgraded a laptop cpu from an Athlon XP 1800+ to an Athlon XP 2600+ , carefully respecting the motherboard chipset support, system bus speed, voltage, heat dissipation ...

The new cpu is running at a maximum of 9.5 clock multiplier :
that is 9.5 X 133 = 1263 Mhz
instead of the theoretical 15 X 133 = 1933 Mhz of the cpu

The laptop is running Windows XP Sp2
I suspected Powernow, but setting the power management to "always on" only enables a steady 9.5 multiplier
Maybe a limit on top of Powernow ? The BIOS settings are extremely limited on this laptop (an Acer Aspire 1310)

Everest and CBID seem to identify this 9.5 multiplier limit
trying to force the multiplier to 15 with overclocking software (CBID or cpumsr) always ends up in a PC freeze

the old cpu is a AXMH1800FQQ3C
the new is a AXMG2600FQQ4C (at least, this is what is written)
both run at 133 FSB
Acer Aspire 1310 with latest BIOS

Any cues ?

Thank's

[thierry_la_fronde]

the spare parts list of this Acer Aspire 1310 laptop shows Athlon from 1800+ up to 2500+
I guess 2600+ is not supported

[Guest]

Probably then a frequency not supported in the Bios

However in fact I did progressed:
I found out that leaving Powernow enabled was the reason why the system froze when I tried to modify the multiplier using overclocking softwares.

When I disable Powernow (power management settings : always on), I am able to modify the multiplier, and to set it to the regular X15 and obtain a steady 2000Ghz , stable.
I had this result with 2 different tools : CBid and CPUMSR

So, now that I know I can perform at X 15 by overriding the system limit, I'd like to find a way to set this X 15 automatically at Windows startup.

Any clue ?




Another topic:
I did not tweak the voltage, however I feel there is a margin because leaving it managed by the system , when Poweron is enabled and limits the multiplier to 9.5, the voltage is always 2v steady, with a 2,5v at system startup.
Since the cpu spec is 2,5v , I think I can get up to 2,5v

Thank's for helping out

[thierry_la_fronde]

Use CrystalCPUID to set the multiplier through a command line invoked at Windows Startup :

regedit
/HKLM/Software/Microsoft/windows/currentVersion/Run
create a new entry (type REG_SZ) in this key, give it a name, fill the data with:
"your_path_to_CrystalCPUID\CrystalCPUID.exe" /F24 /P1 /E

will set multiplier to 15 at windows startup

Thierry

[Guest]

It works great, Thank you

I still have 2 concerns:
if I, or someone else using my PC, switches the power settings to anything but "always on", the PC could freeze due to the settings of the multiplier, conflicting with PowerNow (I have to try that).
moreover, PowerOn is a great feature in order to last on battery and have a quiet PC: with the multiplier at 15, the fan is working almost constantly and often to full throttle.

[D.8080]

The little utility you downloaded allows for different settings?
If I remeber right you can load different cpu settings when needed, like keeping the key in the registry but loading a new set at startup, so having freedom of choice, and at any other time.

Look if it's the case, and you just have to make hand changes.

[Guest]

Yes Crystalcpuid allows different multiplier settings.
You can select them basically within the software interface.
You can also create shortcuts on your desktop to activate one setting.
You can also call one setting at system startup through the registry like described above by thierry_la_fronde.
In fact this method uses the command line interface of Crystalcpuid.

I discovered another nice function of Crystalcpuid:
the "multiplier management" :
once Crystalcpuid is launched, select this function in the drop-down list of functions.
once selected the multiplier shall be managed automatically, in a similar way as PowerNow would do it, but with more flexibility:
You have to define a min/middle/max values of the multiplier in the Multiplier Management Settings (file menu).
Crystalcpuid automatically adjusts the multiplier between the max and the min, depending on the cpu workload.

You must have Crystalcpuid running, however, you may run it in the Hide mode, in which it runs in background, only showng a cpu icon in the system tray : this icon changes color (blue when in min, red when in max).

You may launch this hidden mode at system startup, through the registry, just like above with the command line mode, with the following syntax:
"my_path_to_CrystalCPUID\\CrystalCPUID.exe" /CQ /HIDE

runs steady and stable for hours (even supporting cpuStabtest)

Only one significative problem:
The PC can't run on battery with this mode. Even PowerNow deactivated. Don't know why, it freezes. PC must be plugged to enable this mode.
I must say my battery is so crap that in any case it could not hold unplugged more than half an hour.

Still another item I'm working on is to automatically set Power settings to "always on" at system startup. Probably I'll get through it with a .bat writing in the registry (HK_Current_User/Control Panel/PowerCfg/CurrentPowerPolicy = 3 ) .

Best

[D.8080]

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