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i7 U640 Overclocking

post #1 of 10
Thread Starter 
Hey guys.
I have an Alienware m11X r2.
Core i7 U640
GT335M
4Gb 1066Mhz

now, I have a problem, There will be no screenshots tonight, can be posted tmrw if need be, i'm just so frustrated ive been doing this for hours!

Anyways. im trying to squeeze out every ounce of performance out of my i7, so i decided to overclock it and benchmark using CINEBENCH.


look at the funky results ....

i7 @ STOCK 1.21Ghz : 1.42score
i7 @ 1.30Ghz : 1.39Score
i7 @ 1.45Ghz ; 1.38Score


uhhhh... What? I tryed to get it to its maximum 1.60Ghz but it BSOD's.

it may only be .03 score, And i know ill never ever ever see that difference in an application, but its frustrating just to know that by overclocking 1.2 to 1.45Ghz, thats ~ 15% increase, that i'm going down in the benchmark.

also, the BSOD really bothered me. this laptop was bought second hand locally, still under full Alienware warranty, any thoughts or suggestions?

The CPU itself has never overheated or BSOD'd before, just after the " entering windows " screen, it showed a black scree and my cursor, then died.

more information available upon request, im just so frustrated I wanted some insight.

thanks guys.
Edited by Shea2152 - 5/12/11 at 6:55am
post #2 of 10
Thread Starter 
Bummmmpp
post #3 of 10
How exactly are you overclocking? Does the Alienware BIOS offer some sort of overclocking? If so, can you tell if it's applying more voltage?

From my experience with a Dell XPS system, it had some software overclocking available, but I had no way of raising the voltages rendering most overclocks useless.

Also, check temperatures. Lower scores in a benchmark with higher clocks is often a sign of instability or throttling because of heat.
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post #4 of 10
Thread Starter 
Yeah man, it's the whole " alienwares one button overclock software ", i hate it so much.

you can't up the multiplier, up the voltage, anything like that.
it's just, enable " alienware OC " and select an overclock.

it reeeeeallly sucks.
and, yeah that sounds like a good idea, i'll log the tempuratures, and post them. thanks man, appreciate you replying.

edit: should I have intel's turbo boost and speed step or whatever it's called, enabled?
soryr for not knowing excat names, first time with an Intel CPU, as you can tell by my sig rig. smile.gif
Edited by Shea2152 - 5/12/11 at 5:40pm
post #5 of 10
Speedstep allows the chip to downclock when it's idle and turbo boost will clock up a few cores when they're the only ones doing the work, i.e. a single threaded process.

There are thermal protection measures which you cannot disable with Alienware that are possibly responsible for the lower scores.
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post #6 of 10
Thread Starter 
Alright. I have more results. and more confusion.

Ive re tryed the tests, whislt logging temps.

at stock: 1.20Ghz, max temp of 73c SCORE; 1.42
at OCd to 1.32Ghz Max temp of 71c SCORE; 1.33

now, i think ive discovered why im getting lower scores.

i was also monitoring the speedstep, in realtime the frequency jumps in 'RealTemp'

and what i've noticed is, at stock. the maximum frequency the CPU hit under load was 1715.26Mhz at 99.8%load.


at 1.32Ghz, the max frequency it hit was 1645.03Mhz, at 99.8% load.
i'm even more confused now, why isn't it turboing higher? is this a driver problem?
i sound like a noob, i know haha. But this is my first intel proc, in a notebook format wasnt a smart first move!

thanks guys!
post #7 of 10
Honestly it just sounds like some sort of throttling... I'm not really sure what else it can be. Maybe someone who's more in tune with mobile CPUs can help out.
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post #8 of 10
Use throttlestop.

The reason why normal m11xr2 oc loses performance, is because Dell set Turbo Boost (which gives a 7x multi boost on the UM procs, iirc), TDP limit to 20W, or something insanely low. So if you OC, you immediately hit that limit. However, for about 3 min or so at stock, turbo boost on the m11xr2 will still be okay with it's own turbo boosted multi/clocks.

So ThrottleStop, will allow you to set the power draw and TDP limits to whatever you like, in order to allow turbo boost to function properly without the silly Dell limits, and OC without hitting the same limits.

m11xr2 owner, here smile.gif i7 640UM, too. I'm eyeing the m11xr3 for a stealth upgrade, however...
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post #9 of 10
Thread Starter 
I'd like to publically thank " ablercher " for completely resolving my issue. using Throttlestep, has gotten me to a score of 1.68, and thats only at 1.35Ghz! I can't even imagine at 1.60Ghz.

Thanks man!

also, thanks to Bassplayer for the quick replys !

+rep to you both.

this thread can be closed if a mod sees fit!
post #10 of 10
Quote:
Originally Posted by Shea2152;13485715 
I'd like to publically thank " ablercher " for completely resolving my issue. using Throttlestep, has gotten me to a score of 1.68, and thats only at 1.35Ghz! I can't even imagine at 1.60Ghz.

Thanks man!

also, thanks to Bassplayer for the quick replys !

+rep to you both.

this thread can be closed if a mod sees fit!

Glad you found what you were looking for! We'll leave it open in case someone finds the need to post here in the future. Enjoy your speedy system biggrin.gif
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