BB2K, watercooling a PSU is a difficult challenge, involves a custom waterblock or at least a HDD waterblock (=expensive), and runs the PSU with zero airflow. Right, the MOSFETs will be watercooled but other components may get hot as they're not designed to work this way.
Net result = same money, more risky, less reliable. And it will add another WB requiring maybe a 2nd heatercore...
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