For a long time, I've used RealVNC after a couple others, and while it's generally the most reliable and easy to use of those I've tried, it doesn't appear to be using anywhere near my full local network bandwidth. I'm going to be setting up a few mining rigs tomorrow and'd like a decent VNC client to remotely check up on the computers when I'm not around to use them off a KVM switch.
I've been told Radmin is a good alternative. Anyone care to vouch for it?
Edit: Should have mentioned -- x64 Windows 7