Overclocking 3840QM

[ha1o2surfer]

Hello Everyone, not a first time post to LTT Forums but a first post in this subforum! I have a W110ER with a Modified BIOS to allow the 400+ MHZ increase that is allowed on the 3840QM. I downloaded Intels XTU and bumped up the Ratio from 38 to 41 and CPUz + Intel XTU showed this! http://i.imgur.com/OCiUX1d.png I did a burn in test overnight to see if it would drop but it stayed the same! Burn in test gives me 98-100gflops consistently which pretty good for a mobile CPU and loads the CPU up to 55 watts... So I guess my question is, anybody else have any mobile CPUs they are overclocking and could give me some insight into what is going on?

[felixbearpig]

nice man , are the temps the same?

[mvitkun]

@ha1o2surfer

 

did you disable hyperthreading?

because i7 QM series processors should have 8 threads,but the screenshot shows 4.

also could you link the intel XTU in question,because I haven't heard of it.

 

from what I can tell it's at 4ghz because you set it to 100mhz bus speed and 41 on the multiplier.

so it probably has 1 core at 4.1,another at 4.0,another at 3.9,and the last at 3.8.

so CPU-Z took the average and shows 3.99

[Wi RoZ]

What you did is a pretty high overclock for a small laptop, if the temps are okay then it seems nice to me! 

[ha1o2surfer]

nice man , are the temps the same?

The temps reach around 84C under Full Load. This is an 11 inch laptop though

[ha1o2surfer]

@ha1o2surfer

 

did you disable hyperthreading?

because i7 QM series processors should have 8 threads,but the screenshot shows 4.

also could you link the intel XTU in question,because I haven't heard of it.

I did, I get better performance in games if I disable hyperthreading

 

EDIT: http://www.intel.com/content/www/us/en/motherboards/desktop-motherboards/desktop-boards-software-extreme-tuning-utility.html

 

4GHz just seems a little extreme in the first place given that the base clock is 2.8GHZ. I feel like it's turbo boosting on all 4 cores

[ha1o2surfer]

@mvitkun I see you modified your post so I will reply here. ThrottleStop is showing a multiplier of 40 on every core and so is XTU. If I use Burn in Test and just set it to 1 core, the multiplier stays the same. But I will see if I can dig deeper into what exactly each core is doing. I think you have a good point

[mvitkun]

The temps reach around 84C under Full Load. This is an 11 inch laptop though

full load?as in P95?

 

also if HT is enabled what are the temps in P95?

[ha1o2surfer]

full load?as in P95?

 

also if HT is enabled what are the temps in P95?

I am going to let it run for a little bit and will reply back. This is also my work laptop/play laptop so RDP shouldn't effect anything ;)

[mvitkun]

I am going to let it run for a little bit and will reply back. This is also my work laptop/play laptop so RDP shouldn't effect anything ;)

RDP?

[ha1o2surfer]

RDP?

Remote Desktop. Alright, max temp so far is 91c. This is Large FFT's. Just curious, what does your desktop get on Intel Burn in Test?

[mvitkun]

Remote Desktop. Alright, max temp so far is 91c. This is Large FFT's

try small FFT.

 

I think it's reporting incorrect clock speeds because there's no way you got 4ghz on an i7,with a worse than stock heatsink,with 91C temps.

[ha1o2surfer]

try small FFT.

 

I think it's reporting incorrect clock speeds because there's no way you got 4ghz on an i7,with a worse than stock heatsink,with 91C temps.

Two things to remember here, a Mobile CPUs T-Junction is 105c and it wont throttle until it hits this and my heat sinks fan also cools a 650m. When my computer throttles, it drops the CPU to 1.2GHhz which it did not the entire time. I will try Small FFTs

 

EDIT: Small FFTs don't seem to stress the system as much. got lower temps and it only went up to 3.5GHz this time. 

EDIT again: bumping it up to 41 multi, blue screens it haha

EDIT again...: posted this to the Clevo owners thread of this laptop and someone is getting 3.8 on a 3720QM, interesting.