GPU overclocking

Hi all
As its bank holiday and the weather is poor I have decided to have a play with overclocking my 280GTX.
I have had a little play before but any extra help would be nice.
Thanks in advance.

Try http://www.guru3d.com/article/geforc...erclock-guide/ i followed the basic principals on my 8800GTS and it's worked wonders.

Thanks Stephince for your reply.
I think I should have explained myself a little better when I asked for help. I have RivaTuner and use ATITool for the stress test.
I have the graphics card overclocked at the moment at :-
710 core clock
1506 Shader clock
1260 memory clock

I have just carried out a test for one hour without any problems.
The question is, what do I increase to get even better performance ie core, shader, memory

Raise one until your system crashes/artifacts. When it does drop to back about 10mhz and move on to the next variable. Work that one to the same point then drop it back again.