The more you can upgrade, the better. Even IF it would run on either the first or second system, it'll run much better if you'd upgrade as much as you can. The 3Ghz CPU is good enough, but make sure you have at least 1-2GB of RAM and a GeForce 8*** card. I bought my 8800GT for only €60!! Best single slot card ever. Make sure your power supply can handle the GPU too. Good luck mate, there's still some time left untill the big day;)