I'm trying to figure out what I'm looking at. What are those X-shaped things with the circle in the middle? At first I thought they were just bumpers to make sure the SSD (or SSDs) never hit the GPUs, but the SSD is shown mounted at all 4 corners and will never budge. And they don't look anything like a heatsink. They seem non-functional, yet are bolted in with 4 screws as if they were some major part... Some kind of radio shielding maybe? Just wondering!