Came across this, 2 sites worth looking at, the first informs on how to overclock a Graphics Card using RivaTuna. The site firstly explains overclocking with Coolbits Tweak though it does not appear to favour that one but more so the RivaTuner.
http://www.pcstats.com/articleview.cfm? ... 803&page=1
2nd site below is where you can obtain RivaTuner. I have tried it and flying over London maxed out (FS9) even though It was down to 13 FPS at one point...it ran a lot smoother than it did without RivaTuner. Incidentally, the one below I believe also overclocks ATI
http://www.guru3d.com/index.php?page=rivatuner&menu=8
Have 2Gb RAM - 3Ghz CPU - NVidia GS7800GS.
NHancer that I have was set at High Performance with Anti-Aliasing set at combined 8xs to rid the shimmy effect you get when using graphic Card setting at High Performance.
Regards
Nigel.
RivaTuner Overclocking Graphic Cards
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RivaTuner Overclocking Graphic Cards
I used to be an optimist but with age I am now a grumpy old pessimist.