I did some real bad back of the napkin math, looking at this setup for comparison - [MEDIA=youtube]X0ukdo7Xx7U[/MEDIA]
Based on the sampled noise profile in the video I think that would be my target, and for sake of comparison I came up with this horrible equation (assuming the same fans are used in both setups):
TotalTDP / (RadLength * RadThickness * FPI) == efficiency
Optimum's would be (with a 4090 + 7800x3d)
570 / (480 * 20 * 22) = 0.002698863636
Mine would be (4070 + 3700x):
265 / ((92 * 25 * 15) + (120 + 20 + 22)) = 0.003035509737
I think that puts it relatively in the same order of magnitude at least, so hopefully it should be able to handle that load.
If I upgrade to the 4070 ti however that number becomes 0.004009163803, meaning my system would dissipate heat at about 2/3 the capacity of Optimum's.
...again, this is napkin math so I have no idea if it is valid whatsoever.