Originally Posted by dirkpitt45
the only way overclocking heats up the gpu is if you add volts to it.
That is not true. Increasing the voltage will increase the amount of heat, but just the act of overclocking increases the heat output. As you increase the clock speeds your increasing the amount of work the cpu can do. The more work performed, the more heat produced.
I would buy the cheapest "good" brand name (XFX would be my choice) model available and then buy an aftermarket cooler for it from a company like Arctic Cooling.