If AIO GPU's were more common, there would technically be no point needing to do a full loop water cooling system anymore. You would only be losing out on "looks." The thermals on an AIO would
never get to the point where the card would have to throttle even running low fan speeds. Sure, if I had a custom water loop, the temps may be like 10C less, but who F'ing cares how "cold" your water is as long as temps don't throttle and fans don't ramp up. My AIO CPU I run the fans at a static 700RPM and my temps never go above 50C even on full load overclocked. Proof with decepti0n above is even more. 45C max temp on a huge overclock. I don't think the 980 throttles unless it hits like 80C or 90C if I remember correctly. I think you can reduce a few dB by having massive radiators & dozens of fans running even lower RPM but the loss of resale value, the components corroding over time, the risk of leaks, the maintenance of the unit, the amount of time spent building the loop, the hassle of changing the loop when installing new components, and the sheer cost isn't worth a few dB.