TLDR: loop for 2700x and two 1080ti in a thermaltake P3? Radiator size and fans to stay fairly quiet? My current setup: Ryzen 2700X OC'd SLI 2x 1080TI OC'd (one is a EVGA black with 2 fans, and other is a founders) Asus Crosshair VII Hero 16GB ram a few SSD and spinning rust EVGA 1000 G3 power supply All in a Thermaltake Core P3 I use a Sammy 4K 40" screen and a Vive to game on. Currently the GPU's are on air, and the CPU is cooled by a Corsair H115i pro. I'm happy with the cooling for the CPU. The GPU's get thermal throttled and get FREAKING LOUD still. I have messed with settings a good bit, but it's a compromise between running the fans at 100% or getting thermal throttled. In an open case, sound is more of an issue. I'm open to suggestions. I am thinking I need to go to a custom loop and cool both GPU's and the CPU. That's a good chunk of change. I don't know if I'll run SLI after my next upgrade or not. So few new games make use of it now. Depending on how DX goes, may die off, may get easier. I'm betting on dieing off. I'll probably keep the 1080TIs for a bit longer. I don't see enough of a reason to upgrade to the 2xxx series. Maybe the next. If I do go with a custom loop, how big of a radiator? I can fit a 420mm in the default radiator slot, but I'm iffy on that being enough. The 2700x isn't a power hog, so that helps. On the other hand, I'm doing this mostly to get quieter, not silent, while still having a healthy OC. So I don't want to be pushing fans on a borderline sized radiator. Can one thick 420 cover that heat? seems push pull fans can run a bit quieter than just one set of fans. pondering running a 420 and a 280 or two 360s. Not sure how to mount that.