Help on V6V undervolting: Where to start?

Hi, I am thinking about undervolting my V6V (P-M 1.86GHz, 750) and I am wondering where should I start?

I know that you can adjust CPU voltage with Centrino Hardware Control and test the stability with Prim95. And then I am not sure where to start. Do you test single step at a time? What should be the good starting voltage? What should be the reduction in voltage in each incremental try? Test stability for how long? What happens if you were NOT in front of your laptop when you got the error message from Prim95? Does the laptop receive any damage if the CPU voltage is not adjusted back to default right away when error is reported? What is the downside of the undervolting? Any other good pointers for undervolting in gneral?

Thanks for the help in advance.

p.s. When CPU performance is toggled to 'Dynamic switching' in Centrino Hardware Control, the CPU voltage is reported to be 0.798. Does this mean Centrino Hardware Control already undervolt the CPU at bit a lower steps? (I think P-M 750 runs at default 0.988 volt when at 6x step/800MHz)

 

I noticed with my Z71v that Asus did actually undervolt a bit from the original specs (if you go by CHC's list). I found my current voltages by manually switching to each multiplier in custom dynamic switching and writing down the voltages. Then I took the voltages for every multiplier down the same amount of "steps". I was able to drop every multiplier by a total of between 10-15 steps on mine, but I did it gradually, in one to three step increments. My Z71v is set at the following voltages:
6x: .748v
8x: .828v
9x: .876v
10x: .908v
11x: .956v
12x: .988v
13x: 1.036v
14x: 1.068v

To a certain extent, each processor consumes a slightly different amount, so there will be some variance in voltage. Smilepak undervolted his 2-3 steps further than mine with full stability. Good luck![8D]

drum while you work

 

Thanks for the reply. However, being a newbie with laptop, I still have plenty of questions. [:I] I did the check with custom dynamic switching in CHC and I found the CPU voltage to be:

6x: .988v
8x: 1.068v
9x: 1.116v
10x: 1.148v
11x: 1.196v
12x: 1.228v
13x: 1.276v
14x: 1.308v

So with the drop of 3x multiplier, it would mean that I should try 14x at 1.196V, 13x at 1.148, and so on. Right? How about the low end of multipliers? I know that you have some of them listed in your post but 7x not listed. I am also wondering how long did you test the stability of the CPU?

There are two questions that I am most concerned about were not touched and I would very much to hear some opinions on them. Thanks.
1. Does the laptop receive any damage if the CPU voltage is not adjusted back to default right away when error is reported?
2. What is the downside of the undervolting?

p.s. The voltage under dynamic swtiching at 6x is 0.798v and the voltage under custom dynamic swtiching is 0.988v with CHC. So this is the reason why I am wondering if CHC already did some undervolting when operated in CHC default dynamic switching. Any insight?

 

Judging from the read count, it seems that quite a few people other than me are interested in this as well. So, a friendly self bump is in order?

Any help on the topic will be great, thanks! [ ]

 

Well, I have been doing more reading on the subject of udervolting and have now learned more of it. So I start playing around with undervolting my V6.

Now I seems to have found the lowest stable voltage for my V6 (p-m 750) for the 6x and 14x multiplier. The undervolting is done by CHC and the stability test is done using prime95 (2nd torture test) with priority set to 10. The stability test also last for a minimum of 24 hrs without any error or warning as the confirmation of stable CPU operation.

After undervolting, the lowest stable voltages are:

6X -> 0.700V

after 24hr torture test -> CPU temp: 52C

14x -> 1.116V

after 24hr torture test -> CPU temp: 64C

p.s. The bios version is v0801

Now I will see what I can do for the intermdiate multipliers when I can free up my V6 for a long period of time. Hope more people can share their undervolting setting here.

 

Yeah, on my 1.86 had undervoltage down to like 1.004v stable or something around there.

Sad I can't do the same for my 1.7 overclocked to 2.26. The lowest I've gotten for this is 1.308v hehehe

 

Question:

What's the point of adjusting the intermediate multipliers? I've seen people do this before, but unless you plan to actually use them I can't see the point. Plugged in I'm at x13 (1.73), on battery x6 (800). Unless you take advantage of dynamic switching it's not possible to use more than two - unless you go back into CHC and futz around. What am I missing?

 

just quickly

is it healthy for a cpu to be jumping voltages so rapidly?
i have 3 pst's for my cpu

6.0x @ 0.700v (600MHz)
10.0x @ 0.732v (1000Mhz)
15.0x @ 0.892v (1500MHz)

i'm still in the process of testing, it's been about an hour and it's still going ok (ac profile max)

in battery mode i have it set to auto management, and i don't really like the look of the spikes.. is there a way to set some sort of delay so it stays at the lower processor speed until the higher speed is really needed?

this is a 1.5 banias (although reported by rmclock and cpuz as dothan)

 

what are you guys talking about?

i only know dynamic switching that automatically adjust work of cpu.. but know nothing about lowering voltage, and what it is for generally... sorry I'm newbier than newbie

 

Basically, lowering voltages results in a laptop with a better battery life, and also a cooler laptop, without sacrificing much power, if any.


1000th post, w00h00

 

wow sweet, 1000th. No wonder... I saw your post everywhere!
Im actually close to you, only about 985 post to go....

isn't that what dynamic switching do? Is it different thing? lol

 

Try installing SpeedSwitch XP from http://www.diefer.de/speedswitchxp/. You can modify the settings for switching CPU speed, although I just have it running on the default.

John

 

anyone knows good software? I am currently using speedswitchxp 1.4, my friend ask me to try Centrino Hardware Control.. same thing, only better interface..
only problem is it can't or at least I hadn't found the way to auto change the BRIGHTNESS SETTING when battery is unplugged..

isn't this what everyone talking about?

 

1. AFAIK SpeedSwitch XP only manages the CPU speed and not the CPU voltage.

2. If you have PowerGear installed, then you can adjust the display brightness settings by right-clicking on the PowerGear icon in the system tray and selecting preferences.

John