I have a VM poller with 2 CPU 4 Gb RAM and 8000 elenents on the poller
The CPU is around 20% the RAM is about 3 Gb.
No syslog or Trap
I dont poll inteface /node stat every 120 sec.
Always depends on the load type, but in general the Main Poller requirements are higher as the main needs to handle with Website load, alerting and other operations not related to the polling. There are some operations, which can be done only by main and can't be delegated to Additional Webserver and Additional Poller. However as sja told... for small polling load the 2 CPU (2GHz + ) with 4GB RAM is the absolute minimum configuration for Ad Poller and soon upgrade can be expected (or extending the polling intervals). Safe threshold is at about 60% utilization of CPU so the potential peaks (e.g. on connection drops) can be covered.
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