Hey guys - When i use the ATI Overdrive and overclock my 5770 very slightly - horizontal lines appear when i play games or benchmark. Then all you can do is restart the pc. Its not going over 61oc. Could this be a driver issue? I think ive got the latest. Also ive only got a 2.4 Dual core so it could be getting limited? But why would the GPU crash when overclocking?