[original message lost, sorry] It doesn't really matter what the specs of your box are, putting a monitoring solution on the same box as a production server is a bad idea. What happens when that box fails? What's going to notify you? Nagios won't, since it'll be down, too. I'm not sure about Cacti, but I can tell you that nagios can run pretty comfortably on a fairly low-end machine. We monitor about 100 machines, and about 350 services with Nagios, on a VM. Use the big box for BackupPC, and use some hardware that you retired because it got "too slow" for Nagios. While you're at it, setup at least two Nagios servers so you have redundancy. Otherwise you're in the same situation that I mentioned before: the Nagios box goes down and there's nothing to notify you about it.
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