After a few failed attempts at increasing the clock speeds I went right to the voltage controls and started upping the voltage to reach higher clock speeds. I was only able to increase the clock speed on the GPU by an additioanl 5MHZ but the Shader clock speeds responded well to the voltage and gave up another 92MHz worth of clock speed, giving me final numbers of 754/1235/1593. These are the highest clock speeds I have ever gotten on a GTX 260-216sp card hands down. Fan speeds were kept constant at the 100% mark throughout the overclocked testing as the Matrix was not audible over the Scythe Kaze fans used on my heatsink.



Link: Overclockersclub