Higher temperature after lowering CPU voltage

[Guest]

It was my very first time to try to reduce my CPU voltage. I used Intel XTU, and my CPU is i7-4700mq.
- Room temperature was at 75 F, and CPU idle temperature was 48 C.
Before doing anything, I ran the stress test from XTU and received 92 C max with 0% thermal throttle.
- I changed the voltage offset to -10 mV, hit Apply. Then I ran the stress test from XTU again and received 93 C max with 4% thermal throttle. However, everything was fine; it passed the test.
- I changed the voltage offset to -15 mV, hit Apply. Then I ran the stress test from XTU again and recevied 93 C max with 5-6% thermal throttle. Again, it passed the test.

I changed the voltage offset back to 0, hit Apply. Then everything is back to when I didn't do anything.

Is this usual? It seemed to get so hot that the thermal throttle had to kick in, after I reduced the voltage. Did I do it correctly? I'm sorry for a very noob question.

Is there any page that can show me how to do it correctly?

PS:
1) I tried Prime95, but I don't know why my CPU only got 3.09 GHz max with 98% utilization. Is is supposed to be at 3.4 GHz? My laptop is Clevo W230ST.
2) I'm 100% sure I chose -10, not +10.

Edit: fixing units.

 

[Ok Go]

kaput sensors, your cpu is at 48 and ambient is at 75. unless you are using a refrigerant as a cooler that ussually meant your sensors is giving false readout.
oh, and if you think that the readout cant be false, check your cpu, it's supposed to be covered with water due to condensation.

if you're using a normal hsf cooler like most other laptop than that readout is against the 2nd law of thermodynamics. those hsf cant cool lower than the lowest nearby component temprature.

It is impossible, by means of inanimate material agency, to derive mechanical effect from any portion of matter by cooling it below the temperature of the coldest of the surrounding objects. Lord Kelvin (Thompson, 1851)

 

[Guest]

kaput sensors, your cpu is at 48 and ambient is at 75. unless you are using a refrigerant as a cooler that ussually meant your sensors is giving false readout.
oh, and if you think that the readout cant be false, check your cpu, it's supposed to be covered with water due to condensation.

if you're using a normal hsf cooler like most other laptop than that readout is against the 2nd law of thermodynamics. those hsf cant cool lower than the lowest nearby component temprature.

It is impossible, by means of inanimate material agency, to derive mechanical effect from any portion of matter by cooling it below the temperature of the coldest of the surrounding objects. Lord Kelvin (Thompson, 1851)

I'm so sorry. I should write 48 C, not F. I changed all of them now.

 

[Ok Go]

oh, just a typo. then my guess is, your cpu cooler fan is also affected by the voltage offset, meaning, the lower the voltage you give to the processor, the slower the fan can spin. try consulting to your laptop manufacturer.

 

[Jeffs0418]

Overclocking a mobile processor is not advisable. I would imagine changing voltages is not too. The freq throttling to 3.09ghz is normal thermal management. Your 47W tdp i7 is already tuned for max performance within the confines(and cooling capability) of your mobile platform.

 

[Ok Go]

Overclocking a mobile processor is not advisable. Your 47W tdp i7 is already tuned for max performance within the confines(and cooling capability) of your mobile platform.

undervolting used to be advisable on mobile computing especially on chips that's able to use lower than reference voltage without unstability issues, since the battery lifetime increase outweighs the lower performance.

 

[Guest]

oh, just a typo. then my guess is, your cpu cooler fan is also affected by the voltage offset, meaning, the lower the voltage you give to the processor, the slower the fan can spin. try consulting to your laptop manufacturer.

Thanks for your answer. I heard people with the same laptop being able to undervolt by XTU, so I think it's easy to do. I may be too novice for that.

Overclocking a mobile processor is not advisable. I would imagine changing voltages is not too. The freq throttling to 3.09ghz is normal thermal management. Your 47W tdp i7 is already tuned for max performance within the confines(and cooling capability) of your mobile platform.

I only want to undervolt to reduce some heat. I heard Oc'ing a lot, but I'm too scared to do it.