Quote from ScapGF:
Why not just download Camtasia and find out for yourself? They offer a free demo for 30 days with no restrictions to the software.
Record 1min sessions with various settings to see how much memory/min you are taking up. While running the software you can even press CTRL-ALT-DEL to monitor how much memory the software is using.
So there you have it. A complete answer and it will only take maybe an hour of your time if not considerably less.
I just have to figure out how to get it onto my trading comp, if I don't buy it. My trading computer isn't connected to the internet but to a direct line to the exchange.