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Anawak
01-08-2017, 10:53 PM
Hi there!

I own the G751JY (i7 4710HQ, GTX980m, 24 GB RAM, 256 GB SSD, Windows 10) and startet to experiment a little with OBS-streaming to Twitch. After some time I recognized that this regularly takes the CPU (when the encoding is done via the CPU) to it's limits (100% CPU usage). Even though these are mostly peaks and only very seldom the regular usage, I startet to fear that it might kill my CPU. So I did some research and found out that the temperature is the most important aspect when it comes to very high utilization of the hardware components. So I downloaded the software "Core Temp" as well as "GPU-Z" in order to do some test streams with several adjustments in OBS to find my "sweet spot" between stream quality and CPU/GPU usage. I found this point with the following settings in OBS:

Rate control: CBR
Bitrate: 3300
Buffer Size: 3300
CPU usage preset: very fast
Output resolution: 1280*720 (720p)
Common FPS value: 60
Process priority: normal

With these settings the CPU temps went up to 89 C (at peaks...average around 82 C) and the GPU stays around 70 C. I think the heat which is on the GPU is still fine but I worried little regarding my CPU. So I began some further research in the internet to find out if this will damage my G751 over time and found some...let's say quite contradictory info. Some say that 70 C is already dangerous and some say that the temps in a gaming notebook can go up to 100-105 C without any throttling and/or damage to happen.

Still I wanted to try to get rid of at least some C. In order to do so I used some tips that I found in this forum (I read a lot here already, because there's tons of useful information!): Install the most current BIOS version (check) and get some space between the laptop and the platform it stand on (check). You have to know that I use a cooling pad with 3 fans running at 1200 RPM. This has already 2 build in "foots" which I can put up so that the back of the cooling pad and so the laptop are a little higher than the front.

By doing so I gained some C - Now the peak is at 85 C and the average temp around 80C (all cores). For my testings I played the following games for 15-20 minutes at Ultra graphic settings:

Call of Duty Infinite Warfare
Doom
Overwatch

I still lose some frames while streaming but they are below 1% of all frames...I think that's ok.

So why am I writing all this information? Even though I found some posts in this forum where users have written that temps up to 100 C are still fine for the ROG notebooks, I wanted to ask if anyone else here is streaming with the G751JY and having the same temps. Furthermore I would highly appreciate to get some info about the settings you use in OBS.

I hope it's ok to ask these questions in this part of the forum.

If you need any more info, please feel free to ask.

Have a good night and thanks in advance;)

alex

Anawak
01-10-2017, 08:49 AM
Noone here using OBS with this machine?

Ancients
01-10-2017, 09:45 AM
While I no longer have a G751JY and don't stream using OBS, I have another suggestion that might help. Have you tried undervolting your CPU to further reduce heat? I've seen on other forums that somewhere between an undervolt of 60-80mV on the 4720HQ is a sweet spot for lower temps and reliable stability.

Anawak
01-10-2017, 09:54 AM
Thanks for the answer Ancients!

Yes, I have been thinking about undervolting my CPU after I have read about this option to reduce heat in this forum. Still this does not seem to be so harmless (even though I am used to some hardware/software tinkering, I haven't done this undervolting before) and therefore I decided not to touch it for the time being...at least until the temperature does not increase significantly.