940xm Undervolting

I have recently upgraded from the 520m to an 940xm. My temps idle~50c, and load upper 80's. That seems high to me. I could take the whole freaking laptop apart again and reapply the paste, but even if I did, I'm more interested in keeping the temps down.

Question:

Firstly, for other owners of 940xm proc...what are your temps?

Secondly, is it possible to undervolt the proc? If so, how do I go about doing it?

 

My temps have never got over 79c but that is with a cryo cooler.

 

My idle temps with 3% OC (without overvolting), ambient temperature 28C


With throttlestop you can change the voltage but haven't tried undervolting it since I always wanted more not less

 

@ QuadX,

Maybe your heatsink doesn't make a good contact with the CPU crystal? You could open the system to reapply the paste (maybe using a thicker one like MX-3) and check if there's a gap. You could get another HS from Dell if that's the case.

 

I'm not so sure. Clarksfield cpu's run hot. I have a 720 and I average ~ 50-55C in high performance mode myself. In stealth mode it will drop to the mid 40s. Although it's possible I didn't seat mine right either.. which is why the shin-etsu is otw. However I would have had to screw it up a couple of times for that to be true.

sure, but is that in power saving/stealth mode or HP mode? Also, ES samples don't count. We don't know if the OP's is an ES either.

 

Wow lots have gotten the 940 since I've been gone. Mine should be at the base with the M17x R2 waiting for me to sign for them and install. So is everyone using a QS? I havn't been on NBR for three weeks so I feel so out of the loop.

I'll let you know what my temps are when I get the thing installed.

 

Yes DR650SE mine is a QS as well and it's more than fine, you have lot's of reading to do in order to catch up...

 

Yeah I'd say in 3 weeks he's missed quite a bit.

 

These are my max temps while playing Trine (taxes the video card and CPU heavily) with a 5% OC + ThrottleStop's TDC/TDP set to 65/82:

 

See table 33 here:
http://download.intel.com/design/processor/datashts/320765.pdf

and you should find the pinout starting at page 94.

So with a pin mod you can undervolt.

 

Have you tried turning turbo boost off? I saw a significant drop in temps from 83~ down to 60~ when I turned off turbo boost

 

that would be because it's now operating at it's base clock 100% of the time, which is 2.13ghz. Instead of increasing it's multiplier as needed. You're basically under-clocking the processor when you disable turbo boost, so of course it's going to run cooler.

nice, what numbers do you hit when you run a stability program like say, Intel burn test or prime95?

 

Doesn't TurboBoost only act as if there is 1 cpu? I actually found it more beneficial in both games I was playing GTA IV and RE5 to run it with turbo boost off since they make good use of multiple cores. There was significant drops in temperature and increase in framerates

 

it scales clock speed in all situations up to the TDP limit of the processor(whether 1 core or all 8 exe cores are in use, it doesn't matter). The frame rate decrease could be throttling due to heat, which shouldn't be happening. Essentially, by turning it off and just letting the cores remaing at a slower speed and running cooler, it's not trying to run as fast as possible and overheating, which then forces itself to 'underclock'.

 

Hmm I think i need to check for throttling

 

So I ran throttle stop, while hwinfo32 shows that its running at 3.2 ghz, throttlestop shows that its running around at 1.7~ ghz with fluctuations up to 2.0 ghz. Wth is going on?

 

I'd say, I missed over 50 pages in the benchmark thread, and all the new overclocking stuff. I'm going to have more than a few questions I'm sure.

 

That's why we are here. Trust me with the new info you will replace those question marks in your signature with some really good numbers...

 

Thanks, Can't wait to get to it. Hopefully this week!

 

So, after all this...Undervolting is not possible???

 

unless you're willing to risk your mainboard and processor, with a pinmod, no, it's not.

 

Has anyone in the forum tried undervolting an m17x-r2 with a pinmod?

 

I've pin modded before... and fried my socket. I don't think that anyone has pin-modded an M17X, that would be a hard roll to play *when* you break a mainboard and possibly anything attached. There are 998 pins in the R2, if you pick the wrong 2(and trust me, it's easy when looking at so many, I screwed up on 604 pins).. there's ~ a 90% chance you *will* fry something.