QUOTE(xxboxx @ Mar 23 2019, 09:56 PM)
But since the front panel can't be completely removed you have to put the front panel at the side every time you play game? That will make inside your casing full of dust.
Have you tried remove side panel (without removing front panel) and see if the temp drop?
The main problem with your setup are that AMD fan blowing air into heatsink, which afterward the hot air is spread out on the whole casing. The front fan blowing to motherboard while AMD fan blowing out of motherboard, it create resistance. The RTX also making it worse by spreading the hot air everywhere. One way is to change the heatsink to the type that have the fan blowing to the back of case like this:

But you still need to remove the front panel to have better airflow.
If the temp drop when side panel removed, I have an idea how to improve the airflow without spending any money. Can the side panel transparent acrylic be removed? If can (Or you willing to remove it by force), install a filter (pantyhose work like magic) after remove the transparent acrylic and reverse the front panel fans so that it suck out air. Now the hot air that's being blown everywhere will be suck out on the 3 sides of the case while the side panel letting cold air in.
Letting the GPU fan spin faster is not a good idea, it shorten the fan lifespan. It would be better to have the case fans spin faster instead to have better airflow as it would be cheaper and easier to replace. Can all the 4 fans speed be controlled? Because it can get very loud when all 4 fans spin at max speed so it would be better to have it spin at max speed only when gaming.
I didn't test the temp yet when the side panel is removed but i'll do the test later on when I return as I'm currently outstation.
I'm aware the amd stock cooler do blowing hot air everywhere in the case hence the way I setup the current fan layout to combat it but not much. For cpu alone, sometimes if I ran a very heavy task, it tops 80c. What I didn't aware that gpu also contribute to the heat.
For the gpu fan, I agree with you. 100% running fan speed would reduce the lifespan of those fan more, that's why I would always opt for auto or at least 80% fan speed at max. For the case fan, only the rear exhaust fan can be control, the rest are connected to PSU thru dedicated fan controller (the simple low off high controller) but all of them were set to max anyway except the rear one, that sickle flow fan can get really loud when set to max
Good idea on the idea for DIY case, I might do it when I have the time (of course after the test with side panel open)