NO Easytune cannot change fan speed on your graphics card. It can change the clock speeds, but I suggest to not use it for that. Or for any overclocking either
For your graphics card speed adjustments, if you can change them you could use RivaTuner, or ATITool (Yes it works for nvidia) but most like rivatuner for nvidia based cards >>>
RivaTuner
Some 8800's you cannot adjust, you will just have to grab it and see.
There is ways to modify your GFX cards BIOS to up the default speeds, but I will leave that up to you to find and do. Google will help you there, but I cannot suggest such a thing incase something goes wrong and you would feel it was maybe my bad idea. but it is out there, google Will get you there
I would suggest since quads are so cheap right now if you like Q6000 buy a new one so you get G0 stepping it runs much cooler, then you could ebay your old one