Powercolor cards get broken very easily! That is based on my personal experience.
Keep your fnger away from Powercolor. It is just cheap product with cheap quality.
Get HIS, Sapphire, XFX, MSI, ASUS, EVGA, or Gigabyte.
^+1 you need neither a new rig nor a new mobo (unless your current mobo is broken) , just upgrade your GPU to HD5770 or GTx460.
P.S USB WLAN is not expensive, just get one if the internal PCI WLAN gets in the way.