JohnnyLucky :
Jack - Interesting that you mentioned the Cryorig R1 Ultimate. Technical reviews werre very favorable. I just happen to have one in a spare parts bin. A youngster purchased one without checking dimensions. The heasink was too tall for his midtower case so I bought it for half price. I'm considering installing it with Noctua industrial fans. The Cryorig is designed for use with 140mm round frame fans but that can easily be corrected using a case mod solution.
With water cooling, we still see parroted posts about needing high SP fans. While there was a time when high SP fans were needed. the reason they were needed was that high fpi rads were the norm back then. Now we see this advice being repeated today without acknowledging that high fpi rads are very rare. With little to be gained performance wise anymore due to increases in efficiencies in CPU and GPU designs, it's all about noise. To reduce noise, rad manufacturers went to low - medium fpi designs where high SP fans serve no purpose.
Similarly, the fan speed and SP is selected based upon the spacing between fins on the heat sink. The efficiency of the assembly will peak when these two factors are perfectly matched.... using faster rpm fans will undoubtedly increase cooling but it will also reduce efficiency due to the trying to force the proverbial 5 cuft of air thru a 2 cuft sized opening. So while cooling will increase, the relative increase in cooling will be far less than the increase in rpm. And all that means more turbulence and a lot more noise.
So yes, I think it will be an interesting experiment. I don't think it will be viable at full speed due to noise, but you may find toning it down to a 500 - 1500 rpm range quite viable.