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Gtx 980ti in Mini-ITX

Are you talking about this video? There's a huge difference!

No case fans: CPU 71C, GPU 91C
1 case fan (exhaust): CPU 64C, GPU 85C
1 case fan (intake): CPU 67C, GPU 80C
2 case fans (intake + exhaust): CPU 60C, GPU 79C
3 case fans (2 intake + exhaust): CPU 58C, GPU 77C
4 case fans (2 intake + 2 exhaust): CPU 55C, GPU 76C

Airflow is very important, and an insufficient number of fans will definitely affect temperatures. Since small cases naturally have less space for fans, airflow becomes even more important for them. Given that a GTX 980 Ti is the hottest Maxwell card there is (tied with the Titan X, I guess), an mITX case is not ideal.

https://www.youtube.com/watch?v=YDCMMf-_ASE

Thinks he means this.
 
Are you talking about this video? There's a huge difference!

No case fans: CPU 71C, GPU 91C
1 case fan (exhaust): CPU 64C, GPU 85C
1 case fan (intake): CPU 67C, GPU 80C
2 case fans (intake + exhaust): CPU 60C, GPU 79C
3 case fans (2 intake + exhaust): CPU 58C, GPU 77C
4 case fans (2 intake + 2 exhaust): CPU 55C, GPU 76C

Airflow is very important, and an insufficient number of fans will definitely affect temperatures. Since small cases naturally have less space for fans, airflow becomes even more important for them. Given that a GTX 980 Ti is the hottest Maxwell card there is (tied with the Titan X, I guess), an mITX case is not ideal.

Your half right

1. In his video the ambient changed means the temperature readings need to be redyced.

2. Smaller case less air = less fans required to get good temperature s.

I've done this experiment before with a corsair air 540 and a antec silent case. After adding 1/2 fan even running low at 10% usage their very finishing returns.

I run all 3 of my fans at 10% even at full load
 
Are you talking about this video? There's a huge difference!

No case fans: CPU 71C, GPU 91C
1 case fan (exhaust): CPU 64C, GPU 85C
1 case fan (intake): CPU 67C, GPU 80C
2 case fans (intake + exhaust): CPU 60C, GPU 79C
3 case fans (2 intake + exhaust): CPU 58C, GPU 77C
4 case fans (2 intake + 2 exhaust): CPU 55C, GPU 76C

Airflow is very important, and an insufficient number of fans will definitely affect temperatures. Since small cases naturally have less space for fans, airflow becomes even more important for them. Given that a GTX 980 Ti is the hottest Maxwell card there is (tied with the Titan X, I guess), an mITX case is not ideal.

Nope, I meant this one, where there's no change even when he stuffs the case full of ridiculous crap.

 
The only time he "shut off all airflow" to the case was when he started to use the boxes, and it did have a significant effect: CPU 50C to 77C, GPU 82C to 86C.

The blower-style GPU is less dependent on case airflow, but as you can see from the video it throttled heavily during Furmark (the animation repeatedly pauses and unpauses). A reference GTX 980 Ti goes up to 83C. During gaming, it won't thermal throttle, becase the limit is 92C. However, since the boost clock is temperature-dependent, performance still won't be as good compared to an open-air card. If an mITX case requires the use of a blower card, then you will have sacrificed a lot of performance for your small form factor needs.
 
My friend use 980Ti in mid chassis without in out out fan at all. Pretty much he has no fan at all(only for CPU aio water cooler) an closed in a desk. Gaming etc is fine. New home will be coming for him.
 
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