PSU orientation question

[Lumikor]

Case: Fractal Design R5

PSU: Antec HCP 1000W

 

The case is about 5cm above the floor and I'm pretty sure the PSU fan is downward, so it's sucking air in from the floor. But, I've seen few videos that recommend orienting the PSU fan upward so it'll suck air from the case and give better air flow. So, which way should be better? My bottom GPU is close to the PSU (both GPUs are now Gigabyte GTX1080Ti Aorus WaterForce Liquid Edition, Both cards running at around 60c at full load) and I wonder:

1. I can even change the PSU direction?

2. Can it really improve thermals and air flow?

 

Other:

I have Kraken X62, the rad is mounted on the front, pulling. 

One GPU rad is at the bottom pulling and the other is at the back pushing.

[Lurick]

You can't really change the orientation of the PSU to mount it upside down unless the case supports that.

It will just pull heat from the GPU into the PSU and probably won't do much for thermals in the long run.

[Yatys 93]

if the case has a whole/fan grill under the PSU mount then you can mount it either way, providing there is a cap between the underside of the case and the floor then it is fine to go that way

[Draconid]

What case do you have?

EDIT: Nevermind I'm apparently blind 

Edited January 20, 2018 by Draconid

[seon123]

It won't make any difference. The R5 has dust filters for the PSU intake, and for the front, so dust shouldn't be an issue. 

[MlnmFlcn]

It shouldn't matter much for you. In my case (sorry, bad pun), there is no ventilation in the PSU shroud (which I wanted when I bought it), so I need to use the bottom intake for the PSU. The only real reason it might matter is for airflow optimization. If your setup has a very negative pressure, a case-intake PSU setup would hurt that a bit more, but still not very important.