I keep meaning to berate you for your awful use of English but then I realised you're Scottish anyway so "edinnaemekennaeduffranceaye". Most RTS games should run on an average PC fairly well.
I don't even know what graphics card I have, i'm pretty sure it's an Nvidia 512MB... something with a 7 (7000 series or am I making that up?) on it I seem to remember, I have 4GB of RAM I know that. But yeah I play RTS games - although not so much nowadays - I think the newest one I played was AoE III, and that ran fine.
What sort of RTS games are we talking about here?