I'm not exaggerating, or trying to be a tech-whore noob, but don't get Ghost Recon, your system will barely run it. My freind with an Athlon 64 2800, 1GB RAM, and vanilla 6800 got about 25fps. I'm not going to try it becauase I know that my system would hardly play it.
I'm dead serious, just read any review about it. And don't think that a PhysX card will help either, because they actually REDUCE performance by adding more geometry and particles. GRAW isn't worth it. Just download the demo and see for yourself.