I have a problem running my new GeForce 440 mx AGPx8 on my computer. I'm running a P4 2.4GHz, 512MB PC3200. When running a game like SimCity 4 or GTAIII, after 20 min or so, it will lock up the computer and create a loud humming sound from my speakers. any ideas??? ive already uninstalled/reinstalled the drivers for the card and AGP slot.