Simple Undervolting Tutorial - Pentium M Dothan - Page 42

Wow this is awesome. Thanks
Could someone post the same kind of data for the Toshiba, specifically the M50. If possible, that would be awesome!
Thank you

its not about the laptop model. every cpu and every motherboard is different. a 1.5ghz dothan might be able to run at 1 volt, but then another 1.5ghz dothan might only be able to run at 1.2v.

you have to figure it out for yourself, because everyones hardware is different.

Thanks for the note drizek.
How do I determine what the values are for multiplier value and the voltage value? What am I looking for in order to know what value to set it at?
Thanks a lot

I'm using CHC and I'm wondering if you guys can help me out. I've set it to dynamic switching, and I'm wondering whether it hurts the cpu if it keeps switching from 6x and 15x frequently.

And can someone explain how the custom dynamic switching works? It says min multiplier 6x and next to it min. load is 40%. on the second line it says max multiplier 15x and max load 15x. what does the percentages mean?

hi ya, from the lack of response to post #820, should I assume everybody (who's running it) has been able to run CHC under non-admin privileges or should I assume everybody is using admin accounts? TIA

P

everyone uses admin accounts. non-admins in windows are useless(at least to the types of people who use these forums)

and no, it doesnt hurt your cpu to keep doing that, not really.

and that just basically means that once your cpu is at 40% use at 6x, it will jump up to whatever is needed. 15x is the max, so it should be at 100%.

so up to 40% use 6x, and past 80% means use at 15x? what's in between?

the M is designed with SpeedStep to speed up/slow down as needed ... it would be doing that anyway whether you undervolt or not... they're totally seperate things - no connection between 'em...

kinda like stepping on your accelerator when you wanna go faster and letting off when you wanna go slower - course it reacts a hellava lot faster than humans can lol

Hi everyone, just in case anybody is interested. Turns out if you want to run CHC under non-admin with CHC's "allow all users access" feature, you need to have Windows' Secondary Logon service running (I guess it uses the runas command). It's a lot easier than making CHC run as a system service or M$'s runas command.

P

Hey guys, great responses and work here so far, sorry I havent been to keep up, I'm in college now. Thank you for posting your detailed results Gadget, data is always great. And indeed it is true that each CPU will undervolt differently, hence you have to try it out for yourself. In CHC make sure you use your lowest multiplier, 6x, and your highest only. Also, a great note on limited accounts pomp, thanks. Finally, the in between in the 40%/80% mark is whatever the CPU was at until it hits the other mark. Those two points act as switches.

Hi, ive been trying to undervolt while doing prime95 torture test. im down to 1.036 but the strange thing is that the temperature has been 59/69 degrees celsius all along. shouldnt this be dropping too? im kinda puzzled about this and maybe the undervolting isnt really working as it should. any ideas on why the temp isnt going down/what im doing wrong?

edit: it says 1.308V in the "current" req.voltage in the general tab. so i guess its not working? :S

and when doing nothing and on battery it says 6.0 mulyiplier and .996...no wonder the fan is always on...i need to do something about this or send it back :S

Thanks to everyone for their info in this thread, this is the first time i've tried undervolting, and your info has made it really easy.

I've got a 2.26Ghz and I've managed 6x @ 0.700 and 17x @ 1.180V, using CHC. I've just got some questions about CHC...

If I turn on Custom Dynamic Switching, my max multiplier becomes 16x and I only run at 2.13... When viewing the custom dynamic switching steps, no 17x multipler is listed, so I guess the current version doesn't support the 2.26 yet?And although I can choose 17x under CPU Voltage, every time I Set a value, I get a message which says "Custom dynamic switching and probably also the system dynamic switching only set the multiplier: 8,9,10,11,12,14,16. Not used multiplier by custom dynamic switching: 17". So I had to turn of custom dynamic switching.

Also in RMClock there's an option for auto-adjusting intermediate VIDs. Is there something similar in CHC? Because although I can set the voltage for 6x and 17x, if the CPU adjusts to something inbetween, won't it suddenly increase the voltage because no custom value has been set? And I can't specify an exact voltage for each multipler because there aren't enough drop-downs boxes to select each increment... Do I have to force it to only use either 6x or 17x (how?) or will it automatically adjust the voltage for each intermediate multipler like RMClock? Or does it only switch incrementally between multipliers if Custom Dynamic Switching is turned on?

Thanks!

EDIT: I've since noticed that if my multiplier changes to 8x or 10x or anything inbetween the 6x and 17x I have configured, then my voltage does increase to 1.388 or whatever the default is. It doesn't stay on that value for long because the multiplier becomes 6x or 17x depending on the load immediately afterwards, but i'd still prefer the intermediate multipliers to have values within the range... so am I going to have to use RMClock instead?

If you're using CHC, make sure you click the "Set" button to apply your new voltage. If you're using RMclock, make sure you click "Apply" after any changes.

bump for my question 2 posts back...

And a quickie for RMClock experts, which it looks like I will have to use unless someone can give me some answers for the CHC questions... The default Profile for Battery is "No management"... I am assuming it must also be put on Automatic Management (or Minimal if u really need your juice to last), otherwise the whole point of increasing battery life is missed?

it defaults to that so that RMClock won't run unless you set it... set it to automatic management just like the AC Profile and use the Battery Mode to set the performance/battery savings level you want...

i've been playing around with rm clock and CHC, got mine down to 0.7 and max to 1.004 on my pm750. i changed the dynamic switching to custom and set each step to a certain voltage and all is going well, however...

when i look at the cpu clock under status i was getting multipliers of 4x and 5x running somewhere between 500 and 800mhz. (by the time i am writing this thread it has bumped back to 6x at 800mhz.

should i be worried by the temporary drop in multiplier and clock speed or was it just an error with CHC?

i will post updates to whether i notice this happening again.

update:
chc shows my cpu clcok at 480mhz (3x), 520mhz (4x) and 696mhz (5x).

i thought the minium multiplier was 6x at 800mhz or am i misunderstood?

Okay guys, maybe I'm the first, but I seem to have permanently damaged my CPU with Centrino Hardware Control. At first, I undervolted my i9300 1.86ghz P-M like a lot of other people were doing, although I didn't quite go as low as everyone. I got to 0.780V min and 1.132 max using Prime95 for 6+ hours, and decided to use 0.796V and 1.180V. After running those with Prime95 for about 4 hours, I got an error. I increased the voltages to 0.844V, and 1.212V, and still got errors. At this point, I got scared, so I turned off CHC, restarted the comptuer, and did another Prime95 test. I was good after 8+ hours using the small FFT, but when I did the large FFT, I got an error within 5 minutes every time I tried. I have no idea what to do now.

Please, experts, help me! My i9300 is less than a week old, if I broke it, and they won't give me a new one, I'm screwed.

Edit* After talking to more people, it seems very unlikely that CHC damaged the CPU, but that there might've been faulty ram to begin with, and it just took a day or two to show itself since I have 1GB of it, and probably wasn't using the faulty memory bank. If that's the case, I'll just request new memory and send this memory back. I'd actually prefer to avoid the hassle of a return anyways.

Make sure your Power Scheme is set to "Maximum Battery" in the Control Panel > Power Options. I had mine at "Always On" and the voltages would be very weird (sometimes the voltages would go to 1.xx volts even though the customized multipler & voltages max at 0.988V). Set it to "Maximum Battery" and everything works correctly. My test method (with the quick test from CHC). I plugged in my USB flash drive and USB wireless network adapter, run on battery until it was about 20% left, and load a burned DVD movie using PowerDVD. The laptop freezes everytime playing the DVD (even though it passes CHC short test) when running at 16x and volt is less than 0.988 volts.

My P-M725 (1.6GHz): 0.700V @ 6x and 0.988V @ 16x (no crashes or freezes so far)

I'm not sure where you read 15%. If you not completly satified with your laptop (and I wouldn't be based on what you decribed earlier) then I would call Dell Customer Care ASAP and tell them that you think your processor is bad and that it is causing errors and you would like a replacement system or a refund. They should be more than happy to do that and it shouldn't cost you anything.

Martian

HamTard,

Download Memtest86 and run it through a dozen or so loops. It sounds like a memory problem to me rather than a processor problem. Perhaps Dell will just have to send out a replacement stick instead of going through the hassle of sending the whole system back. Good luck

Joe