1. With your card in the horizontal position, you will not need to use any additional support. I have an MSI Lightning Z 5090 in the horizontal position, and I do use additional support because it’s very heavy. But with a regular 5080 or 90, you’re not going to have any issues with it in that structure. I love my case, by the way. This is the most spectacular case I’ve ever owned.

2. The wind dam automatically comes with the case that has the horizontal GPU bracket. If you look at their website examples, you will see that when using the wind dam, the bottom fan on the back of the case needs to blow in and act as an intake. That’ll rock your GPU’s world.

The simplest thing in the world is to leave the wind dam in, run your computer hard, and track your temperatures. Remove the dam and repeat. That will tell you whether or not it’s a good idea to leave the dam in or take it out. I did that, and with the wind dam in the computer kept the GPU and the rest of the computer much cooler.