Question High CPU Temps when using GPU ?

[Scuti]

Hello! So I have some problems with my new build PC, so I have:

Motherboard Gigabyte B760M DS3H​

RTX 3080 TI (Zotac Trinity),​

Intel I5-13500,​

CPU Cooler Thermalight PA120​

My problem is that CPU is overheating in a weird way, so I used Cinebench for testing, when it was 100% the temps were at ~75C (I put power limit at 100W in BIOS), so its okay, but for example, when I play lets say CSGO, where its using only 30% CPU and like 20% GPU, it got to above 90C, where GPU was at ~80C. On startup its about 30-40C, when im only using GPU( CPU is at like 5% usage, ~15W) and its on ~80-90C, the CPU temps go to 50-60C.
Also as I have mATX, everything is very close to each other, like GPU almost touching the Cooler, there are 2
intake fans(120mm) and 1 outtake fan(120mm) in my case(im planning to expand it to 6 fans)
And one CPU Cooler Fan is a little above than it should be because the RAM is there.

What should I do? Is it bad airflow? Or just bad combination of gpu and cpu?
Here is visualization in paint

https://imgur.com/a/ZccRy1K

 

[Unolocogringo]

What is you exact case.
Some have glass of closed off front panels making the front fans useless.
Higher temps on the CPU is normal but yours is a little on the high side.
Your GPU dumps all of its heat in the case. So case air to the CPU is hotter.

 

[Scuti]

What is you exact case.
Some have glass of closed off front panels making the front fans useless.
Higher temps on the CPU is normal but yours is a little on the high side.
Your GPU dumps all of its heat in the case. So case air to the CPU is hotter.

For now I have some unpopular case, Oberon Pro Silent, there is Glass panel, I can put 3 fans max, so I was thinking about DeepCool CG560 and having 6 fans.

Edit:
Disclaimer, I have the outdated one, so im not sure about the naming, but its Oberon Pro with Glass Panel on the Side and 3 fans max.

 

[Phaaze88]

Disclaimer, I have the outdated one, so im not sure about the naming, but its Oberon Pro with Glass Panel on the Side and 3 fans max

Oberon Pro Silent | MODECOM | Official Site

MODECOM OBERON PRO SILENT case has been designed for users who appreciate a spacious and functional interior combined with an attractive, modern design.

en.modecom.com

That one?
Specifically when the Zotac Trinity 3080Ti is active, you use enough energy to overwhelm the capacity of the air traffic through the case.
This probably would've been OK-ish if the gpu was a blower/turbo model instead, but it's not, so it would be a good idea to settle for a more porous case.
The Deepcool CG560 you were thinking about looks to be a fine choice. A review(if you're interested): https://www.techpowerup.com/review/deepcool-cg560/

 

[JohnBonhamsGhost]

2 intake fans(120mm) and 1 outtake fan(120mm) in my case(im planning to expand it to 6 fans)
And one CPU Cooler Fan is a little above than it should be because the RAM is there.
What should I do? Is it bad airflow?

you don't mention the model of fans you are using or any speed curve setup in place.

if these are just some generic junk then you are definitely not moving much air at all.
but even if they are a nicer model with high airflow & CFM there is a limited amount of cooling they can provide in this situation.

i would definitely be upgrading to a nice case to house everything but i would also be revamping the system-wide cooling setup.

for this setup i would be looking at at least 3x cool air intake and 2x warm air exhaust fans with very limited airflow obstruction.
that's also considering that they are a nicer model set of fans.

 

[Karadjgne]

CSGO only uses like 2 cores, and it Will max those cores to 100%, so your 30% cpu usage is not a good comparison.

That Peerless Assassin cooler is 200w+ cpu capable, on one condition. That it actually sees fresh air at some point. It's physically impossible to mechanically cool an object to below ambient temps. With that in mind, the cpu ambient is the inside of the case, not the outside. So with that 3080ti dumping @ 400w± of heat into the case, the ambient are going to climb without good airflow.

What you can possibly do is put ½" spacers under the screws holding the glass to the side, that'll allow the heat to escape naturally, although you'd need longer screws.

 

[Scuti]

Oberon Pro Silent | MODECOM | Official Site

MODECOM OBERON PRO SILENT case has been designed for users who appreciate a spacious and functional interior combined with an attractive, modern design.

en.modecom.com

That one?
Specifically when the Zotac Trinity 3080Ti is active, you use enough energy to overwhelm the capacity of the air traffic through the case.
This probably would've been OK-ish if the gpu was a blower/turbo model instead, but it's not, so it would be a good idea to settle for a more porous case.
The Deepcool CG560 you were thinking about looks to be a fine choice. A review(if you're interested): https://www.techpowerup.com/review/deepcool-cg560/

I have similiar one but I think they are not selling these now, its almost the same but just have the Glass Side Panel and max 3 fans, For now im waiting for the Deepcool case and see if it will help

 

[Scuti]

you don't mention the model of fans you are using or any speed curve setup in place.

if these are just some generic junk then you are definitely not moving much air at all.
but even if they are a nicer model with high airflow & CFM there is a limited amount of cooling they can provide in this situation.

i would definitely be upgrading to a nice case to house everything but i would also be revamping the system-wide cooling setup.

for this setup i would be looking at at least 3x cool air intake and 2x warm air exhaust fans with very limited airflow obstruction.
that's also considering that they are a nicer model set of fans.

They are some basic fans, so probably junk fans as you said, they are from old model of my case, I will upgrade it to the one I mention before, maybe that will be better, I will let know after I got it

 

[Scuti]

CSGO only uses like 2 cores, and it Will max those cores to 100%, so your 30% cpu usage is not a good comparison.

That Peerless Assassin cooler is 200w+ cpu capable, on one condition. That it actually sees fresh air at some point. It's physically impossible to mechanically cool an object to below ambient temps. With that in mind, the cpu ambient is the inside of the case, not the outside. So with that 3080ti dumping @ 400w± of heat into the case, the ambient are going to climb without good airflow.

What you can possibly do is put ½" spacers under the screws holding the glass to the side, that'll allow the heat to escape naturally, although you'd need longer screws.

Well its not only about CSGO, its just an example, when I used for example Cinebench to get 100% of CPU, it was ~70C, but when I used GPU in addition they both got to 80-90C, so im my mind, its the GPU that overheating the whole case making the CPU overheat, so I guess its the bad airflow or gpu is too close to heatsink, but im not sure, for now im upgrading the case, and will let know if thats better, also I just removed the side Glass Panel and it helped a bit, so I guess its just a bad case and fans

 

[Karadjgne]

Yes. The cpu uses ambient air, which is the air inside the case. So if the temp of the ambient air in the case is 40°, that's the starting point for any additional temp, the lowest the cpu/gpu can run at. If the ambient case air temp is 60°, then that's the starting point. So you may start at @ 30° with a cpu test, and then add in the 400w from the gpu test and after a few minutes the temp inside the case changes, gets considerably higher, so the air across both the cpu and gpu heatsinks gets considerably higher, so the work Delta temp is starting from that hot point and will continue rising until you reach the saturation point.

In simple terms, a cpu/gpu is acting like a chicken in a convection oven. Close the door, no air, chicken cooks. Open the door, plenty of air, be lucky to get the chicken defrosted.

The Oberon is a nice case, looks wise, but thermally it's an airflow design disaster, not designed to handle the sheer thermal output of a 3080ti.

You'll get far better temps turning the cpu cooler fans backwards, turning the case fans backwards and using the rear fan as intake and the front fans as exhaust, get rid of the front glass panel, or use a high cfm/rpm airflow fan at exhaust and high sp/rpm radiator fans in front and force airflow.

 

[Scuti]

Ok I upgraded the Case, and added 2 additional fans, its great now, 100% CPU & GPU and still at 70C, in CSGO at ~50C, so its very good now! Thanks for responses!