Core 2 Duo, is there a way to tell Windows7 using different VID?

I have a SU7300 that has these p-state:

0.8 Ghz (SLFM) - 0.875v
1.2 Ghz LFM - 0.900v
1.3 Ghz HFM - 1.0125v

now I've tested the cpu and it is stable using 0.875v at 1.2 Ghz and 0.900v at 1.3 Ghz

I know that there are some software for undervolting, like RmClock, Crystalcpuid or ThrotttleStop

but I've seen that EIST remains active and those programs haven't complete control over p-state, furthemore there isn't any option in bios to disable it, the only way is going in \system32 and take away the EIST driver but so the cpu remains always in HFM (1.3 Ghz - 1.0125v)

So my question: is there a way to modify the EIST driver or something inside Windows7 so override the default VID allowing undervolting without using those programs?


and other two little questions:
1- is it possible to use 6X multiplier in SLFM?
2- is it possible to use 8X multiplier in HFM?

Thanks

 

Nobody?

 

You should post in the PLL overclocking pinmods and examples thread, they will know exactly what you are talking about.

 

I made little guide how you can force Windows 7/Vista to use Custom power profile(profile from rmclock).

This works with W7/Vista professional and Ultimate editions, GPedit.msc is not available in W7 starter or Home Premium.

1. Enable RMclock OS power profile from RMclock and set settings (in RMCLOCK) you want to use and click apply.

2. Open registry editor(windows key+r and type regedit).

3. Go to HKEY_LOCAl_Machine\SYSTEM\CurrentControlSet\Control\Power\User\PowerSchemes

4. Under PowerSchemes there are power profiles which are named like 8915fe2d-72db-4a0f-ba28-63feefdcb0f9.

5. Locate the profile which has description value "Rightmark CPU Clock Utility Power Scheme".

6. On the left side of the registry editor, right click the key which contains the "Rightmark CPU Clock Utility Power Scheme" and select copy key name.

7. Now we open Group policy editor(Windows key+r and type gpedit.msc)

8. On Group Policy Editor go to Local computer policy->Computer Configuration->Administrative Templates->System->Power Management

9. On the right side there is object "Specify a Custom Active Power Plan", Open it (double click).

10. Set it enabled and paste the key we copied in registry editor, then remove text HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\User\PowerSchemes\

11. Restart computer.

Now voltage settings from rmclock should work like they work in Windows XP. Also when you have to change power profile settings, you have to disable Custom power plan setting from Group Policy Editor or your settings wont be changed(requires a reboot).

PS. I hope someone understands this guide. It is easy if you have ever used Registry editor and Group policy editor.

 

Set your power profile-> Processor Management -> Minimum processor time to 100%. Then load Throttlestop and set your VID preferences for the profiles available (0.825V@x6 - DC, [email protected]).

FYI: m11xR1 and Asus ULx0VT are overclocking their SU7300 anywhere b/w 1.6-2.1Ghz. Some runng that speed @0.9V. Lots of headroom in that CPU.

 

Thanks for the replies, I think to disable EIST (and SLFM of course) because I see no difference in power consumption at idle between [email protected], [email protected], [email protected] (tested with killawat)

on everyday loads using fastest speed than 800mhz allows the cpu staying in sleep state C3-C4-C6 more time so doesn't affect OVERALL power consumption and battery life

some days ago I've emailed Abo (SetFSB) to add my PLL to the program's database, hope reaching 266mhz (1.73ghz cpu speed), ram would be the limit...