I was playing around with the bearing flow rate formula Shannow showed above that has both the RPM and oil supply pressure variables to see how the flow curves might look. I made an assumption for the "clearance ratio" and bearing diameter and length just so I could see how the RPM and supply variables effected the flow.
Flow increases from both RPM and supply pressure as can be seen in the graph below. The orange line is the flow with no added supply pressure - ie, the bearing was feed at 1 atmosphere (zero gauge pressure). The blue line is the same bearing with the oil supply pressure changing linearly from 30 PSI at 1000 RPM to 90 PSI at 7000 RPM - ie, the typical GM V8 type of oil pressure increase with engine RPM.
Flow increases from both RPM and supply pressure as can be seen in the graph below. The orange line is the flow with no added supply pressure - ie, the bearing was feed at 1 atmosphere (zero gauge pressure). The blue line is the same bearing with the oil supply pressure changing linearly from 30 PSI at 1000 RPM to 90 PSI at 7000 RPM - ie, the typical GM V8 type of oil pressure increase with engine RPM.