Could you maybe zip tie a 120 or 140mm fan on the bottom as an intake?
In my experiments with this case, without a GPU even a full-fat 140mm fan could be fit into the bottom as an intake but on the inside - so yes absolutely - zip ties aren't even necessary! Could use some nice semi-adhesive rubber-nubs with the added benefit of anti-vibration.
Please also note that the rear of the case can also have a 92mm fitted to it, although it only has the mounting points for 80mm. Shame Jonsbo didn't just move the mounting points over as there is more than enough space to properly fit a 92mm fan as exhaust on the back. Also, there is space to rig up two 80mm one on top of the other, that would involve a little more effort though - but still not much.
Couple of things to note:
- Remove all the dust filters, especially that silly one on the front intake grills that is glued to the inside of the chassis. Rip it off, it helps, I have tested this. The obstruction really slows airflow.
- If you are struggling a lot with temperatures, also remove the IO shield on the motherboard - the more space exposed to the open world the better. Also, it opens up a good chunk of space under the PSU for it to suck in some cooler air from outside.
You could try mounting a Slim 120mm Fan on the outside between the feed.
This would also work however it would be required that you up the height of the feet in some way, as even with a slim fan there just isn't the height to accommodate something mounted underneath.
As for top-down coolers, they fight with the glass and have no path to fresh air - on top of that, they fight with the exhaust when you have it populated. In my tests, it didn't help much with VRM, and sometimes made it worse depending on the configuration becasue it was just blowing hot air back down onto the board. Get the heat out - always. If you put intake in the bottom, it could work great however.
Also vrm can reach 105c and still be fine.
This is true from what I have read.
Fact is, without a GPU, you shouldn't really be struggling with thermal issues especially considering the fans you could throw in here without the GPU there. That being said, I am not sure why you are having problems. I run the same cooler as you with a 1060 and never suffer heat problems.
@wiretap also has a 1080ti and I believe an overclocked chip in his U1 Plus without thermal issues. It can be done! Don't give up hope!
As an aside
@hardwarevreag , as per the the rules
here, generally the usage of vulgar language in posts here is not tolerated (or at least hasn't been from what I have seen, and it being removed in the past) so just a friendly reminder to keep an eye on that so we ca keep the great discussion going along
I am not an authority on this, just wanted to give a heads up
