>90% CPU-load in PM510V, will upgrading to PM511 lower the load?
No PM511 will not reduce the load but it will eliminate many potential system software bugs as latest PM510 system software is from year 2001 and latest system software
for PM511 is from December 2016, There are several hundred corrections...And latest system software is strongly recommended to avoid potential latent bugs.
If you perform an ANPER task load analyse during 10 minutes or so, you will get better understanding about what exactly is causing the load and you can take necessary action.
PM511 give you support for a fully redundant AF100 interface boards.
With PM510 the CI520V1 AF100 interface board is a single point of failure.
As S100 I/O is used you also have support for redundant S100 I/O bus when using PM511, The S100 I/O Bus is a single point of failure when using PM510
As a AC450 with PM510 is 22 - 24 years old, as a preventive maintenance action, it's strongly recommended to replace the SR511 voltage regulators and the DSSR 165 / SA168
24 volt supply, especially if they are not made redundant.
The voltage ripple increases with aging SR511 voltage regulators and may affect central rack components.