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Undervolt Benchmarks

post #1 of 28
7/3/05 at 7:57am
Thread Starter 
Okay, since the voltages and frequencies are few and far between on this board, I wanted to create a topic where people can post the lowest voltages for their select CPUs. Please, PLEASE, post your CPU, since most people seem content to leave it at "Dothan!" That way, people with the same hardware won't have to spend countless hours doing torture tests...

Also, since I use Power4Gear with my Asus Z71v, I'm testing every frequency in between... 6x,7x,8x, and so on. That way, they can be used with the "Dynamic" setting.

If you're new to benchmarking, I suggest you visit this thread. Needle wrote an excellent tutorial that I am fortunate enough to have been able to understand!

Please note, I just started doing tests today, and am currently testing 13x as we speak. I will run each stress test for 6 hours, and I only suggest posting stable values! Anyways, here's my info thus far...

Pentium-M 1.86ghz
6x .700V
7x
8x
9x
10x
11x .924
12x .972
13x 1.020V
14x 1.068V

currently stress testing 10.0x voltages....
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post #2 of 28
7/3/05 at 1:26pm
Look up one of the post i did. On the z71V when i had the 1.86 originally in one of the post i post all of the voltage setting I was able to get with each multiplier.

I believe I've gotten lower @ 14x. Cant remember.

Right now I am using a 1.7 overclocked to 2.26. At x17 multiplier I am able to downvoltage it only to 1.3v
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post #3 of 28
7/3/05 at 1:27pm
Bu the before and after the undervoltage on the sandrasoft came out the same.
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post #4 of 28
7/3/05 at 2:16pm
Thread Starter 
Would you mind posting them here? This isn't for my purpose as much as it is for everybody. I saw some of your posts, but I think the lowest one I saw for a 1.86 was for 1.116...

On a side not, can I use the 400/533 DIP switch with the 1.86ghz processor?
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post #5 of 28
7/3/05 at 3:03pm
i'm only running at 1.308 at 2.4ghz.. i used to run lower.. but doing extensive benchmarks.. i would get an error after a couple of hours of prime95
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post #6 of 28
7/3/05 at 3:28pm
Thread Starter 
What kind of temps would you get with that? Also, do you have to go all the way to 2.4ghz? Can you undervolt it to something like 2.0ghz, for instance?

Speaking of which, if you flip the dipswitch, you can just set the "max" multiplier to 1.86ghz and it'll stay at that, correct? Or do you HAVE to reset the FSB back to 400mhz to get it to stay?
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post #7 of 28
7/3/05 at 4:29pm
http://forum.thinkpads.com/viewtopic.php?t=11988

you will find your answer here.
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post #8 of 28
7/3/05 at 4:47pm
Quote:
Originally Posted by Redmumba
What kind of temps would you get with that? Also, do you have to go all the way to 2.4ghz? Can you undervolt it to something like 2.0ghz, for instance?

Speaking of which, if you flip the dipswitch, you can just set the "max" multiplier to 1.86ghz and it'll stay at that, correct? Or do you HAVE to reset the FSB back to 400mhz to get it to stay?
~50 doing office work etc... up to about 65 in games.. and ~68-69 with stress tests..

if i'm on battery the temp decreases quite a bit prob cuz of the video card

i was at 1.8(18x100mhz) now it is 2.4(18x133mhz)
dip switch just goes from 100 to 133mhz or the other way around..

underclocking would only be possible with software that lets you select the mutipliers you use.. for example in centrino hardware control... you can select to use only 1 mutipler.. and in my case.. i can set it to 10 and use 1330mhz..

this isn't that flexible with CHC.. you can change the mutipliers with software. but the difference with z71v is that you can flip from 100->133 vice versa with the dipswitch
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post #9 of 28
7/3/05 at 8:07pm
Thread Starter 
Isn't it from 400->533, not 100->133? Either way, I'm shutting down to give it a try... wish me luck!
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post #10 of 28
7/3/05 at 8:34pm
My stress testing for most multipliers was non-intensive, but these have served me well for a few weeks, and none of them made CHC crash during its test.

Pentium M 1.86 GHz
Code:
6.0x  = 0.700V
8.0x  = 0.764V
9.0x  = 0.796V
10.0x = 0.828V
11.0x = 0.876V
12.0x = 0.924V
13.0x = 0.972V
14.0x = 1.052V

Oddly enough, I've seen someone with higher low-end voltages and lower high-end voltages with the same processor.

I would like to point out, by the way, that not all processors can operate at the same voltages and multipliers - not even "identical" processors, like Pentium M processors at 1.86 GHz. As an example, mine operates at lower voltages than does yours (for the most part, at least.)

And the FSB is 100/133 MHz quad-pumped to 400/533 MHz.
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post #11 of 28
7/3/05 at 9:51pm
Thread Starter 
Well, I was able to achieve some of the voltages you list, but after about an hour of Prime95, I would receive an error here and there. So I would have to upgrade it... I'll give some of your voltages a try as well!
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post #12 of 28
7/5/05 at 5:35am
My specs are in my sig. My temps run 35-39 idle and 40-50 when doing stuff...
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post #13 of 28
7/5/05 at 6:15am
whats the point, every batch of cpu's are different, and that is the whole point of undervolting. you going to have to stress test it anyways if you desire system stability, just drop the voltage 2-3 levels at a time, once it becomes unstable in prime, than find out what range it got unstable at and then drop or raise it one by one in prime.

All you going to do is open up questions like, "How come your P-m 1.8 has x.xx voltage and I have the same spec proc and I cant get it that low!!"

all you need is common sense..
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post #14 of 28
7/5/05 at 7:22am
Still, it's nice to get an idea of what's possible. On my 755 I have
Code:
  6x = 0.700V
  8x = 0.716V
 10x = 0.748V
 12x = 0.812V
 14x = 0.876V
 16x = 0.924V
 18x = 1.004V
 20x = 1.148V

Using clockgen I've overclocked from 100MHz to 120MHz, but SuperPi starts getting errors almost immediately with the processor at 2.4GHz. So my highest stable overclock is with a 19x multiplier, 2.28GHz and then I leave it at full voltage, 1.340V. I haven't tried to undervolt while overclocked yet. I suppose if it's possible, that would help control temperatures...
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post #15 of 28
7/5/05 at 1:35pm
Thread Starter 
The CPUs are the same--the only problem is, mine is a 533FSB and yours was a 400, hence the voltage differences. Plus, it gives people good starting points.
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post #16 of 28
7/5/05 at 3:24pm
2.0 GHz Pentium Ms are identical to 1.60 GHz Pentium Ms, design-wise. The difference is that one was capable of operating at 2.0 GHz at a specific voltage, while the other could only manage to scrape up 1.60 GHz. That's both the overclocking and undervolting principle - not all "identical" CPUs are created equal.
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post #17 of 28
7/5/05 at 5:18pm
Thread Starter 
No, what I meant was, both of ours were sold as 1.86ghz processors. I'm not saying all processors are the same... obviously, a 1.6 is different from a 1.7, and so on. I also wasn't taking into account the 400/533 FSB trick.
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post #18 of 28
7/5/05 at 5:20pm
Quote:
On a side not, can I use the 400/533 DIP switch with the 1.86ghz processor?
Yup, but it only will make your computer slower...ehheehhe
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post #19 of 28
7/5/05 at 5:21pm
Thread Starter 
I already found my answer to this problem... I have the newer, 533mhz processor, so I can't overclock. WHY! ;_;
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post #20 of 28
7/5/05 at 5:25pm
Quote:
Originally Posted by Redmumba
I already found my answer to this problem... I have the newer, 533mhz processor, so I can't overclock. WHY! ;_;
Sell your 1.86 on ebay for approx 210.00

Buy the 1.7 for approx 160ish - 170ish..

Overclock that to 2.26

BAM!
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