How to: Disabling SpeedStep with Conroe ES Steppings 4 and 5

[freecableguy]

Here it is gentlemen, playing with CPU MSRs can be fun....

Steps:
1) Open CPU-Z so that you can see the active multiplier switch in realtime
2) Open CrystalCPUID -> Function -> MSR Editor
3) Type 0x000001A0 in the MSR Field
4) Click "RDMSD" (read)
5) Copy the upper 32-bits of the EDX resigister to the box below (should be 0x00000060 or similar)
6) Copy the lower 32-bits to the box below (should be 0x63940089 or similar)
7) Change the 3 (as in 0x63940089) to a 1
8) Click WRMSR (write)

You CPU's maximum multiplier (default on XE is 11x) is now set and the CPU will not step down. I see no difference in idle temperatures doing this. Long term affects have not be judged yet as I just did this about 1 hour ago. CPU seems to respond quicker in benchmarks and doesn't show the tendency to step down at the "wrong" time.

Before:



After:



Enjoy!

-FCG

[doc6886]

Does this work for Yonah chips (in laptops)?

[Silver Bullet]

Nice trick .. I'm just missing ... a motherboard and an nice shiny ES Core 2 Duo

[theteamaqua]

wow conroe @ 4.5GHz yet ur windows is still the cheapest (visually) lol. optimized for benchies huh?

[thunderstruck!]

wow conroe @ 4.5GHz yet ur windows is still the cheapest (visually) lol. optimized for benchies huh?

Huh? What do ya mean?

[ethernal]

wow conroe @ 4.5GHz yet ur windows is still the cheapest (visually) lol. optimized for benchies huh?

Or maybe he doesn't like FisherPrice XP?

It's probably Windows Server 2003, which doesn't default to a 9 year old's theme.

[Lestat]

is this something that must be done on every windows boot ?
and since this isnt doing any hardware modifications is it possible to do this with a simply registry edit ?
your using a binary/memory address .. where is this location actually stored ?

[stummerwinter]

Tried it at my Merom, no impact, maybe wrong setting...

Every time I read the values, I got different EAX...

I looks, I can´t write it back...

[eva2000]

does this stick only for windows session ? would have to redo this each reboot ?

[realsmasher]

isn`t that the same as disabling EIST in Rmclock ?

this makes the pentium M don`t clock down anymore(just like celeron M for example).

plus : it works forever, but you have to restart to (de-)activate it.

if this works for conroe too, i think it`s a better solution.

[overcrash86]

work fine, thanks freecableguy

now i need to find how to change the multiplier

that worked 2 time with a clean 2k3 server, but now didn't work, don't know why, after installing systool i got few problems with Crystal CPUID, wrong frequancy, can't change multiplier, then under clean windows XP can't change multiplier

i need x7 or x8 for testing MAX FSB !!!

[Fixxxer]

Thanks for sharing

[leejsmith]

I guess setting power management to always on dosnt work like laptops with pentium m if it's not set to always on it's speed steps down.

[overcrash86]

i can't find the MSR for the multiplier, i think it's 0x00000198, but doesn't work, same as the multiplier managment of CrystalCPUID

[freecableguy]

Does this work for Yonah chips (in laptops)?

MSR = Machine Specific Register

so....probably not
i will check it out though on my laptop a little later

[overcrash86]

MSR = Machine Specific Register

so....probably not
i will check it out though on my laptop a little later

please can you give me a dump of your E6700 with speed step disabled ?

regards,
Overcrash

[BulldogPO]

Is W2k3 server significantly faster than XP? And all XP drivers work on it?

[overcrash86]

Thanks to Franck@X86 for his help, he had help me to find how to manage the multiplier :

Si tu veux hanger librement le coeff :
- utilise un éditeur MSR (comme celui de crystal)
- édite le MSR 0x1A0
- mets le bit 16 Ã:banana: 1 (EIST on) et le bit 25 Ã:banana: 0 (C1E off), soit dans eax : 0x61850089

Dans le power options de Windows, mets toi en mode desktop / toujours actif.

A partir de lÃ:banana: le changement de coeff de crystal va fonctionner.

approximately translated :

-use an MSR Editor same as CrystalCPUID
-Edit the MSR : 0x000001a0
-Set the bit 16 to 1 -> 0x61850089

into the power management of windows set always on

then have fun !!!

[ea6gka]

FCG , do you think that this "trick" can work with older cpu's AKA presky's and preslers?

[BulldogPO]

So disabling EIST in bios do'nt work with Conroe?

[overcrash86]

So disabling EIST in bios do'nt work with Conroe?

yep doesn't work

[BulldogPO]

I wonder if bios updates will fix that EIST disable switch?

[Danger30Q]

Thanks FCG - it works perfectly with my Conroe 6700 ES Stepping 5 and Bad Axe v304 board.

[Danger30Q]

I just rebooted and it went back to its default speed stepping. Does this have to be set everytime on a reboot?

[stummerwinter]

GREAT JOB!

Got ist also running for my MEROM...

MRS: 0x000001a0

from

EAX: 0x62970089

to

EAX: 0x60970089