6800 NU Overclocking 2D for higher fanspeed and lower temps? So I have an EVGA 6800NU. Basically when it runs overclocked the fan speed bumps up a lot, and lowers temps. I've found that if I overclock my 2d core to 350mhz (my 3D core is at 400MHZ), it lowers my idle temp to about 45'c from 57-58'c. Is this a bad idea or a good idea?