Undervolting results for SL9400 (Lenovo X200s)

Thanks to this guide, I've used RMClock to undervolt the SL9400 in my Lenovo X200s.

• Attached are screenshots of the before/after voltages - I've used the Performance on Demand profile. 0.9250v was as low as RMClock will allow me to go, so I've dropped the VID on all the indexes to 0.9250v
• I chose to disable the IDA profile, but not the SuperLFM (which is in use most of the time)
• After all my stress testing, I was never able to hang/BSOD the machine, or hit any ORTHOS errors. I don't think 0.9250v was low enough.
• Some data from those runs
  • VID = max core 0 temp / max core 1 temp
  • 1.0375v = 66/69
  • 1.0125v = 66/69
  • 1.0000v = 66/69
  • 0.9750v = 64/68
  • 0.9500v = 62/65
  • 0.9250v = 60/64 (so I'm now running about 5.5 degrees cooler at full load)
• I used this task scheduler method to launch it on login; most info on this method fails to mention to configure the task to not disable itself when on DC power at login, or when transitioning to DC power. This can be done by editing the task and going to the Conditions tab under Power.
• I noticed voltage spikes (in the CPUInfo tab of RMClock) after doing all the above, and used the Power Saver profile trick from the same thread to solve this.
  

So other than HW/pin mods, I'm still looking for a way to test VIDs lower than 0.9250v. Any ideas?

 

regedit maybe?

Run regedit>HKEY_CURRENT_USER\Software\RightMark\RMClock
Then right click>new>Dword value.
Name the DWORD "UnlockVid".
Then right click on the value and change the value data to 1.

 

This regkey will expose lower VIDs in the RMClock UI, but they don't actually have any effect - selecting them will result in the same behavior as selecting 0.9250v (for example, the VID shown in the CPU Info tab will read 0.9250v).

Any other ideas?

 

hey Flynn - I have an SL9600 on the same platform as you and while my highest multiplier is 8.0X (same as your IDA, my IDA is 9.0x) I was only able to bring it down to .95 V - at .9375 V was BSOD; my 7.0x is now at .95, I do not remember if it was BSODing at .9375 or if I put it at .95 just to be sure as I go from SLFM directly to 8.0x anyway (IDA disabled same as you).
Also my defaults were lower than yours to start to, so maybe you would not have been able to stably go lower than .925 anyway - for your peace of mind .
of course slightly different CPU and all that....

 

Interesting, thanks for sharing. I haven't found any solutions, so I'll have to pretend that <.925 will BSOD : )