I am so happy, with my cosmos II PC case. 11mm copper almost 30mm thick incl. backplate altogether. I fear you need a copper backplate and a copper water block top to to keep 4080/ 4090 cards at reasonable temperature. I am not a friend of plastics/ acrylics used in waterblocks. Can´t wait for a review. Edit: @sfdmark : I totally agree with you in any aspect, you can´t avoid acrylic, pom, or any other form of "plastics", I would have written better "synthetics" in a custom loop. And in fact, there is no qual. issues at all, if you look out for pure silence, no problem. My PC case is closed, I don´t care about LEDs, only a matter of taste. BUT: recently I have seen testing data of a 4090@550W with pcb temp. @ almost 70°C max..!! Imho, because of enormous cooling capabilities a GPU waterblock must have today, from OC perspective, it might be mandatory to use maybe even an active copper backplate for heat dissipation. EKBW charges €240.-, now depending on similar design, a passive copper backplate should´t add more than €10.- to price tag. Or maybe if they design clever enough, they can offer a "copper" upgrade sometime. Reviews will show And actually, in fact, today, imo, you can´t buy or pre-order anything without having someone look over it before.