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Laptop Undervolting Help

post #1 of 10
Thread Starter 
Hey guys

So I recently read the Laptop Undervolting Thread and decided to try it out on my Core Duo T2400 using the RightMark CPU Clock Utility. Could someone point out what settings I'd have to run Prime 95 in (and for how long) to stability test it? (Cos the link for the suggested program 'Orthos' in the guide doesn't seem to be workigng now.) Also, would running BOINC tasks on both cores (100% usage) be considered stable?

Also, if someone could point out some more detailed reading material about the P-state transition logic settings and whether i should tweak that a bit. And also if I'm gonna have to tweak the 'Use throttling' settings under CPU settings.

Thanks guys!

Edit: So I did some more googling, and found out that I don't have to use both at the same time ( P-state transitions and ODCM)

Edit 2: Also, if someone could tell me how to stress test at lower multipliers? Not sure if I have the right idea but, I did some changes to the 7x and 8x multiplier VIDs and left the 11x multiplier at my last stable VID, but whenever I stress test with Prime, it always uses the 11x multiplier (hence its voltage) Is my system still stable? Or will it crash at 50-60% usage?
Edited by OCcomet - 10/24/11 at 2:34pm
post #2 of 10
For Prime stress testing, anything between 4-24 hours is deemed "stable" on Small FFT's or Blend. Of course, the longer you run it the safer you'd be. But no stress testing tool will be as good as actually using the computer. My rig is P95 stable with 1.375v, but to BOINC, i needed to bump the volts to 1.3825v. Also SCII wasn't that stable with 1.375v

To stress-test at lower multis... dunno. ANY stress-testing tool will load the CPU to the highest, thus bumping multipliers to the max. For this, then the best stress-test would be to actually use the laptop itself with your programs. Unless it's something that pegs the CPU @ 100%, you can stress test multiple configs.
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post #3 of 10
You could use throttlestop. IMO it's a bit easier to use since it has a built in benchmarking system.
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post #4 of 10
Quote:
Originally Posted by HybridCore View Post
You could use throttlestop. IMO it's a bit easier to use since it has a built in benchmarking system.
ThrottleStop is a great, unobtrusive program to use for undervolting (heck, I use it myself); the built-in TS Bench isn't exactly what one would consider a stability test, though.

Comet - The quick way of doing it: http://gigaflopd.com/downloads/ibt/

If you can pass several runs of this, then move on to a 12hr Prime run.

http://download.intel.com/design/mob...s/30922106.pdf

3.10 gives a VCCHFM of 1.1625v; you won't be able to go any lower than 0.95v, so don't worry about the listed 0.7625v VCCLFM.
post #5 of 10
Thread Starter 
Thanks for the replies guys, +rep for all.

Quote:
Originally Posted by Starbomba View Post
For Prime stress testing, anything between 4-24 hours is deemed "stable" on Small FFT's or Blend. Of course, the longer you run it the safer you'd be. But no stress testing tool will be as good as actually using the computer. My rig is P95 stable with 1.375v, but to BOINC, i needed to bump the volts to 1.3825v. Also SCII wasn't that stable with 1.375v

To stress-test at lower multis... dunno. ANY stress-testing tool will load the CPU to the highest, thus bumping multipliers to the max. For this, then the best stress-test would be to actually use the laptop itself with your programs. Unless it's something that pegs the CPU @ 100%, you can stress test multiple configs.
Good to know, I haven't really used Prime 95 in the past, since I never OC'd or anything.

Quote:
Originally Posted by HybridCore View Post
You could use throttlestop. IMO it's a bit easier to use since it has a built in benchmarking system.
Will check it out!

Quote:
Originally Posted by jlells01 View Post
ThrottleStop is a great, unobtrusive program to use for undervolting (heck, I use it myself); the built-in TS Bench isn't exactly what one would consider a stability test, though.

Comet - The quick way of doing it: http://gigaflopd.com/downloads/ibt/

If you can pass several runs of this, then move on to a 12hr Prime run.

http://download.intel.com/design/mob...s/30922106.pdf

3.10 gives a VCCHFM of 1.1625v; you won't be able to go any lower than 0.95v, so don't worry about the listed 0.7625v VCCLFM.
Thank you, sir!
post #6 of 10
Throttlestop is at techinferno. Go to the top of the page and find the downloads link. Should be there if you scroll down. Throttlestop 4.
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post #7 of 10
Quote:
Originally Posted by OCcomet View Post
Good to know, I haven't really used Prime 95 in the past, since I never OC'd or anything.
I do agree with jlells01, Intel Burn Test is a more complete stress-testing tool than P95. On my C2D OC's, when it was 8-hour P95 stable, 30 mins of IBT got it unstable. It generates 5-10c more heat, so you could even consider it a true worst-case scenario testing.

I just downloaded Throttlestop 4.0, and it's awesome. Been recording my temps, and i was able to artificially downclock my CPU, and passed 2 IBT runs on x12, x11 and x10.
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post #8 of 10
Thread Starter 
They just give us 1 voltage to tweak in Throttlestop, correct?
post #9 of 10
I didn't see this concisely stated(sorry if someone pointed this out), but for testing lower multipliers on RMClock just uncheck all the faster multi's. Example: say the max multi is 11. Then to test the 10 multi, uncheck "11". To test 7, uncheck 8, 9, 10, and 11. If you have half-multi's also uncheck those, of course. Testing lower multis at 100% load is great for getting the correct min. voltages at each level.

But no it's not extremely crucial, since you won't be running lower multis at 100% in general(exception - if you have your CPU speed lowered to save battery).

As for the best (fastest) way to test, decrease the VID roughly every minute while running Prime95 to find the first voltage that black screens under stress-testing, and work your way up. Wrote a bit more on it here if you're interested: http://www.overclock.net/laptops-net...l#post15390772 <-- This is the quickest way to find a stable voltage. Of course you could take an estimate and run Prime for 8-24 hours if you feel like running it overnight.
 
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post #10 of 10
Thread Starter 
Quote:
Originally Posted by jrbroad77 View Post
I didn't see this concisely stated(sorry if someone pointed this out), but for testing lower multipliers on RMClock just uncheck all the faster multi's. Example: say the max multi is 11. Then to test the 10 multi, uncheck "11". To test 7, uncheck 8, 9, 10, and 11. If you have half-multi's also uncheck those, of course. Testing lower multis at 100% load is great for getting the correct min. voltages at each level.

But no it's not extremely crucial, since you won't be running lower multis at 100% in general(exception - if you have your CPU speed lowered to save battery).

As for the best (fastest) way to test, decrease the VID roughly every minute while running Prime95 to find the first voltage that black screens under stress-testing, and work your way up. Wrote a bit more on it here if you're interested: http://www.overclock.net/laptops-net...l#post15390772 <-- This is the quickest way to find a stable voltage. Of course you could take an estimate and run Prime for 8-24 hours if you feel like running it overnight.
Thanks a lot! That was exactly what I was looking for (testing lower multis).
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