My 7950X desktop idles at 46c after it's been on a while. PBO is set to limit the CPU to 105W power draw, but Core Boost is on in the Asus BIOS. 6800XT and the 7950X are both liquid cooled in the same custom loop with 2x420 rads. I DO keep my fan curve set to aggressively quiet, though.
My 7900X idles around 44C. I messed with my overclock a long time ago so I couldn't really tell you what the settings are now. My cooler is the Noctua NH-D15.