cpu frequency drops when gpu is at 100% usage

[Rafael Vieira]

hey guys, i came here couse I need help.

i have a acer aspire 3 laptop with an i5-7200u and an mx130

the problem is that when i'm doing something gpu intensive, the cpu frequency drops from 3.1 (turbo boost) to 2.5 (standart), witch wich drops the fps and doesn't let the maps load.

i thoght it was a temperature problem, so opened the laptop up and cleaned it, but the problem remained, and the temps weren't that high anyway (mid seventyish)

then i thought it was becouse the cpu and gpu heat pipes were in series and he was heatting up the cpu (wich it is and itsometimes makes the cpu reach 85C and thermal throtle).

then I searched for ways to solve heat problems so I undervolted the cpu and tried to undervolt the gpu (witch I  couldn't couse the curve graph doesn't appear in my afterburner and yes i installed what I think is the lattest version 4.6.2) and the problem remained

after that i noticed that the cpu frenquency droped even if the temps were low (almost 70) after arround 20 seconds of cpu and gpu at 100%.

so power delivery i thought, so i checked the energy mode and i was in balanced. i've now changed to high performance but the problem remains.

at this monent I think it can be not enough power (65w power brick for delivery and 15w cpu (normaly it hovers between 9 and 11w) 30w gpu, and 1tb hard drive, 250gb 970evo, 8 gigs of vengeance 2666 memory on top of the 4gb soldered to the motherboard and the standart awfull 768 screen at 85hz (its overclocked).

I think the power is enough but im not sure. it it isnt can i buy a more powerfull one without damaging anything?

is the problem something else?

any help will be awsome and really needed

and btw why can't i undervolt the mx130 gpu

[Jurrunio]

It's the power limit. If plugging in the power plug does not help, then there is no solution unless someone else has hacked the BIOS.

[SansVarnic]

-= Topic merged =-

Please keep subjects to one topic.

[5x5]

Power limit throttling - the laptop has a power limit that makes sure you don't overload the power delivery and destroy it. Blame Acer or making a shit VRM and PCB design.

[zeusthemoose]

Like others said, I believe it is a power delivery issue. Some laptops give more power to the cpu or gpu than the other when it is in high usage. 
I believe the energy profiles you are taking about balance the power with the fan speed instead of cpu and gpu profiles.

[Rafael Vieira]

1 hour ago, 5x5 said:

Power limit throttling - the laptop has a power limit that makes sure you don't overload the power delivery and destroy it. Blame Acer or making a shit VRM and PCB design.

why the hell can't it deliver max power for it's own parts!!

those 8% of extra power make a decent difference in such bad cpu

[Rafael Vieira]

is it software limited? if so is there anyway of changing it without bios (it was pretty much nothing on it)

[Jurrunio]

10 minutes ago, Rafael Vieira said:

why the hell can't it deliver max power for it's own parts!!

those 8% of extra power make a decent difference in such bad cpu

Partly because of power brick weight, more power = more copper in it = more weight to carry. Mostly because of cost savings.

 

6 minutes ago, Rafael Vieira said:

is it software limited? if so is there anyway of changing it without bios (it was pretty much nothing on it)

It is programmed into the BIOS, but not user-changeable (i.e. locked away)

[Rafael Vieira]

Can I limit gpu power? if yes how

 

[5x5]

1 hour ago, Rafael Vieira said:

Can I limit gpu power? if yes how

 

That won't help. Power is only shared on AMD laptops. Intel and Nvidia both set their own power limits. You could disable the GPU entirely, the CPU would still operate at cTDP down (10W)

[Rafael Vieira]

7 minutes ago, 5x5 said:

That won't help. Power is only shared on AMD laptops. Intel and Nvidia both set their own power limits. You could disable the GPU entirely, the CPU would still operate at cTDP down (10W)

it only happens when both are being stressed (they can be stressed to 100 separatly. So it is the powerbrick botleneck after all? can I uograde it without board damagecouse of more current or voltage?

[5x5]

4 minutes ago, Rafael Vieira said:

it only happens when both are being stressed (they can be stressed to 100 separatly. So it is the powerbrick botleneck after all? can I uograde it without board damagecouse of more current or voltage?

it's a BIOS limit in place. Upgrading the power brick won't help as if you run both at maximum clock you'll also overload the cooling solution.

[Rafael Vieira]

1 minute ago, 5x5 said:

it's a BIOS limit in place. Upgrading the power brick won't help as if you run both at maximum clock you'll also overload the cooling solution.

and there is no possible way to change it, right?

[Rafael Vieira]

guys, i just noticed the the gpu at 100% actually throtles back the cpu. does this change your point of view?

 

[Rafael Vieira]

i'm really sorry for bothering you so much, but is it possible that the fan is stealing the power from the cpu, cause the ramping up coincides with the throttle down

[5x5]

1 hour ago, Rafael Vieira said:

guys, i just noticed the the gpu at 100% actually throtles back the cpu. does this change your point of view?

 

 

1 hour ago, Rafael Vieira said:

i'm really sorry for bothering you so much, but is it possible that the fan is stealing the power from the cpu, cause the ramping up coincides with the throttle down

 

2 hours ago, Rafael Vieira said:

and there is no possible way to change it, right?

No, no, and no. There is nothing you can do. If you "remove" the limit, the laptop will destory itself by overloading the power delivery and cooking itself to death. Laptops are designed with EXTREMELY tight tolerances and even a minimal change in power draw/heat can have massive repercussions.

[zeusthemoose]

1 hour ago, Rafael Vieira said:

i'm really sorry for bothering you so much, but is it possible that the fan is stealing the power from the cpu, cause the ramping up coincides with the throttle down

The fans are going up because the temps are going up. When the gpu is at 100% it is using more power and getting therefore the cpu is getting less power and lowering its speeds. When the gpu is at 100% it gets hot so the fans have to speed up to cool it. The fans speeding up and cpu throttling down are both caused by the gpu and shouldn’t have an effect on each other.

[Rafael Vieira]

the temps ain't that high, it ramps up when the gpu is at 67C. so could I change the fan profile so it only ramps up at something like 78C without damage?