I found this interesting, maybe someone else also. Rendering a 12x6k pano needs at rendertime:
Standard: 9,50GB (+-0,0%)
+Adaptivity: 10,90GB (+14,5%)
+Denoising: 18,80GB (+97,7%)
+Adaptivity+Denoising: 18,82GB (+98,1%)
+One additional pass: 10,65GB (+12,1%)
+Two additional passes: 11,78GB (+24,0%)
Adaptivity+Denoising+two additional passes:
21,10GB (+122,1%)
Good Luck