Hi,
Please follow the steps given in the link to know the EPS of your Windows server.
https://www.ibm.com/support/pages/qradar-how-measure-eps-rate-microsoft-windows-host
Once, you have the EPS from your 40 Windows machines, then you decide where to integrate them based on the EPS capacity and availability of Event Collector or Event Processor in your deployment.
Hope it helps.
#QRadar#Support#SupportMigration