How to Give your notebook 3hrs of battery life.

OK i am a nobody, and im not a genius or anything. Nothing here is of my own thinking, so i take no credit, other than the observation.

Ok sometime ago i was looking for a solution as to why my laptop ran very hot, for no reason at all. So i found this thing they call "undervolting" . Well it is a procedure that is used to make your cpu use optimal volts, or should i say not use more volts(see as you can see i cant even dig up the right terms) than it needs. This in turn makes you laptop use less energy than it would. (oh it does not have any negative effects and dosent harm you notebook in anyway).

So after undervolting my cpu (penryn core 2 duo t8300) and then using the vista power management/saver (Power saver option), i noticed that my average battery life jumped from 1hr30 mins to around 3hrs15 mins

Here is the current config of my 6860
stock screen
cpu t8300
2 hdd ( western digital 250gb(stock) and fujitsu blah blah 250gb)
replaced the thermal paste with as5 and stupidly replaced the thermal pad on the northbridge with as5 too.

Here is the link to the udervolting guide that i learnt from.

Code:

xxxp://forum.notebookreview.com/showthread.php?t=235824

Ok the forum mod thingy is preventing me from posting the url to the guide. but the guide is also from notebookreview

 

Great. Regarding posting, probably due to you have low posts, you need at least 10posts, i think.

 

so what volt did you wind up using?

 

I got my T8300 to run at 0,9625v stable

 

Btw, wont your system overheat with the AS5 on your northbridge? i did the same, and got huge temp spikes

 

well here is how my setup looks like:
hmm i have attached it.

Well i thought that would happen, but it hasn't i put a fair amount of as5 on the northbridge to make up for my stupidity. If i know where they sell the thermal pad, i would replace it asap.

 

Thermal pad replacements can be had here:

pctoys.com/840556020769.html

Reputable seller according to Google

 

Thanks man i will check it out.

 

Actually, the thermal pad you reference is .13mm. You need something closer to 1.5mm... try this... http://forum.notebookreview.com/showpost.php?p=4097477&postcount=7 for some ideas

 

What if you were to stack 11 or 12 of them on top of each other? It sounds ridiculous but it may be viable since the thicker ones look exceedingly difficult to get.

 

Which thickness of the thermal pad, would be ideal for a 6860fx? For the northbridge ofc

 

sorry, my bad, i was assuming 7811FX, which should be quite similar. Do you have a gap tool?

 

Im assuming you might aswell be talking to me fiziks, since Im still having GPU temp problems (which I think is due to my Northbridge being without a proper thermal pad)..
I dont have a gap tool - where can that be bought? :-/

 

Man, dude, those mods are tight. I just didnt understand why E-wrecked needed to shims.

thanks again. i will probably order them this evening

 

Love UVing. At low setting with lights down and off (where applicable) I can get almost 4 (FOUR!!) hours. almost.. like 3 hours and 30-50 minutes.

I got it UV to .9875 and I still haven't gone until I got the BSOD

 

**** thats tight. 4hrs. what laptop you got ?
you know if you really need all the juice you can also turn of bluetooh and wifi. i think you can get an additional 15 mins.

 

As for the whole putting as5 in the...northbridge you guys call it? The chip close to the cpu? In any case, I tore the thermal pad on that back in say...March and I tossed in some AS5 there to close the gap. Since then, my temps have sat at 49-51. It has never gone beyond that. Do I recommend it? Probably not, but if you don't have a thermal pad handy, it'll make due, just don't put TOO little like you normally would on a cpu, but yet don't empty half your AS5 tube into that spot.

 

Does anyone know how much battery saving difference can be achieved by decreasing the voltage compared to decreasing the "maximum processor state?" I like being able to change processor power usage easily, but gaining a lot of battery life is a bit tempting.

 

Im not following, please what do you mean by processor state ?

 

Hes referring to undervolting and underclocking.

 

decreasing the voltage, greately reduces the power consumpition which in turns increases battery life.

Processor state: if your referring to speed step (multiplier), the lower the n.o the slower the speed of the processor, but also the higher the battery life.

The best way to go is to find an optimal mix.

its amazing for me. i dont game that much when im on the go or sitting on my bed. so i dont need my laptop to be in a powerfull state.
so the benefits are
low heat
less noise
dont need to plug in the power

I think i get more than 5 hrs cause my laptop goes into sleep mode when it becomes idle on battery.

 

Yes a mix of underclock and undervolt can give you excellent battery life.

I run my notebook on battery like this:



Locked on 6x SuperLFM (600mhz @ .850v)

600mhz is powerful enough to surf, chat and play music while on the go.

 

What cpu do have ?

looking neat by the way

 

the bottom line is, go undervolt your cpu. make sure you test for stability. as for everything else, it's completely free and it's a win win situation for you. as long as you follow instructions there's no need to debate with yourself if you should do it.

 

Does anyone know how I could undervolt my P8400 without being forced to downclock my processor by 100Mhz? Apparently, RMclock does not work properly with my processor because it cannot recognize half multipliers.

 

from what i heard is that the p8400 uses half multipliers, so in some instances you will loose speed or something like that.

Please read the guide that i linked to above. someone in the comments has more info about your question.

 

I didn't find anything in that thread that suggested a way to get around the problem. I doubt that there is a way around it right now considering the lack of info there and the fact that no one in a thread specific to the problem could suggest anything: notebookreview.com/showthread.php?t=290099

So do you think that losing 100Mhz of performance is worth reducing my max load CPU temp from 81C to 60C ? I have my 8x and 7x multipliers set at 0.9735V; it isn't stable at 0.9250 except for the 6x multiplier settings.

 

In a word YES.

you have all the benefits of undervolting plus battery life, lower temps

and above all
you can always switch back when you need too.

 

FX 7811

(sorry for the late reply)

Once I get it back from the repair place (screen problems) I plan on getting the UVing to the lowest allowed, hopefully I could top off that 4 hours.

 

I get over 3 hours currently on powersaver, 3 and a half hours give or take 15 minutes on power saver. I don't trust undervolting, that will increase the amperage, I don't like that idea.