Had a bit of a problem with the EK 390x waterblock.
Cleaned out the complete system 2 months ago and found that the nickel plating was wearing away and exposing the copper. Odd thing is that it was in the non-channel areas. The main effected areas are where the block butts up with the plexiglass. Some of the fins also had the same problem. These were the fins lowest in the case (the board has a 90deg rotation so vid card is vertical). So...had to pull this out before more coating wore away and caused problems with the rest of the system.
So, replaced the vid card with a reference 5700XT and new EK block. I also replaced all the tubing in the system, pulled the silver coil, and replaced with new tubing. Now using distilled with Mayhams Inhibiter+ and Biocide+. The new tubing layout is far easier to bleed and looks more interesting to me. Order: res -> pump -> T-section for drain -> front rad -> back rad -> cpu -> gpu. The problem before was getting air out of the rads after clearing the blocks. Now rads clear up, then I can clear the blocks. Much easier.
GPU temps: (no overclock needed)
Furmark 1440p vulkan: 70c junction.
AoTS 1440p vulkan: 69c junction and topped at 2.2+ ghz
Doom 1440p w/o anti aliasing but everything else at ultra: normally capped at 200fps, some drops to 150+
With the 390x and slightly lower settings, Doom stayed between 90 and 120fps.
Maybe I should turn on eyefinity and dual monitor more games just to justify this gpu on 60hz 1440p monitors.