Been talking to a pc dealer about video cards and the problems with FC2. He reckons its not the card but the power supply to the pc, the power in not strong enough. He recommended I upgrade to
XFX Pro 450W Power Supply Unit (Core Edition) P1-450S-XXB9
Unique EasyRail technology lets you to max the available power to run power hungry components without fear of crashing
Easy to set up EasyRail Technology provides maximum power.
Which should stop the crashes & stutter.