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UnderVolting..

blabsaway22
Level 7
Hey guys.. Just was going through this awesome forum.. incredible..

I have an interesting situation and I know you guys are just the right guys to bring this to.

I have a Lenovo Laptop with i7(4700mq) and nvidia 755m graphics, 16gig ram ddr3l (1600)..
Unfortunately Lenovo put major restrictions on this laptop as it has high heat/thermal restrictions and throttles down ..

the next problem is that my laptop runs hot.. i believe because the fans are hard-coded to only run at a speed that can effectively cool when the cpu is at high temps..

so there is all these restrictions on my gaming laptop.. I've researched and researched.. came up with undervolting to decrease heat.. I've also been trying to figure out how to control the fan but guess what? you can't becuase lenovo put a restriction on that too.. hard-coded in the bios.. which is locked etc..

anyway,
I've recently installed Intel XTU tool.. to Undervolt.. settings shown below in picture..

1. is there a good undervolting sticky as opposed to overclocking.. ( i do understand that the point is to get more faster speed not slow down though..)

2. should I be trying to undervolt the vcache also?
43879

3. DO i ever change these for undervolting?

43878
9,032 Views
4 REPLIES 4

Quad5Ny
Level 7
Oh boy undervolting is a bit tricky, because unlike overclocking you not only have to test the maximum CPU speed (multiplier) but you also need to test every speed in-between.

I recently found a stable undervolt for my 4790K; what it involved was:

  • Running Prime95 at turbo speeds (so 4.4GHz) and slowly bringing the offset voltage down until I crashed.
  • After which I brought the offset voltage back up a bit and let P95 run until it crashed or for 2 hours.
  • Next I went and tested all the multipliers from stock (4.0GHz) to 4.3GHz.
  • After I found a voltage all of those were stable with I ran P95 for 2 hours at the minimum multiplier (x8 or 800MHz).
  • After I found that was stable I tested every multiplier from 8-44 for 15min each.


In the end I found I was stable with a -67mV undervolt.

To answer your questions,
A. I don't think Asus has any undervolting tutorials.
B. Leave the Cache voltage alone, its just another thing you would have to test and it barely effects heat output.
C. The Voltage Regulator (VR) Settings are fine as they are currently set, in fact switching the second one to Disabled will actually generate more heat.

P.S. I WOULD NOT stress test (Prime95, LinX, IBT, AIDA64, OCCT) your laptop for hours on end. Laptops are not made to take the kind of power delivery and thermal abuse desktops are.

hi quadNY..

now that's an answer.. i currently undervolted at -50mV.. i haven't noticed any problems.. I do not run prime95 tests though.. i just stress test by the intel XTU program.. all i do is play games that i imagine taxes the CPU so if i get a crash in a game from undervolting then i'll start to change the voltage back up if i need to..

I haven't even began to underclock.. i just left the cores all the same speed that they were..

on balanced power i'm running about 39C temp.. but thats balanced so it downclocks to 1.19ghz.. as it says now..
44005



I really need to start undervolting the Nvidia card next.. i noticed that gets up to 80C temp while gaming.. does that seem ok?? i also having been playing crazy games either.. ARMA III maybe is the most i play..

Hi, I also own a Lenovo Y510P laptop with i7 4700MQ CPU, two GT755m. But what I found strange is your idle CPU temps. Mine are always ~50-60 degrees. My fans are always working and that noise started to annoy me 😄 Did you change thermal paste in your laptop, or those were stock temps when you started using your laptop? If you changed what thermal paste did you use and what difference did it make? I will post my screenshot with undervolt results from XTU program 49964

Praz
Level 13
Hello

This forum is for support of ASUS products only. These type of questions are better suited for a general community type forum.