Today I received my order with Navis 280 for my CPU (which works flawless, I love it!) and a G12 + H55 for my Aorus 1080 TI. I got annoyed by the way I had to mount the AiO in the bracket, but I made it. Previously on Heaven Benchmark on stock cooler I maxed out at 73 degrees, now after launching the benchmark my temps jump instantly +20 degrees to 55, then they slowly go up till like 65 (changed stock Corsair fan for a Noctua NF-S12A, connected to 3 pin for best results). Notice, that my case is open since I wanted to test how everything works, and my plan to mount the H55 as exhaust is going to make temps even worse. At 1st start I hit 71 degrees on the GPU.
Edit: H55 just went crazy about making burpling sound that I thought its leaking all over the place, but it stopped after like 1 minute. Also, the tubes are pretty hot while my Navis almost doesn't get hot at all.