Palit Geforce GTX 280 Review
 

Each and every video card is not going to overclock to the same level, just as the same CPU will not always overclock to the same level for any number of reasons. This holds true with the Palit GTX 280. When overclocking a video card, heat can become an issue in the same way that heat can impact your ability to overclock a CPU. Fortunately, I was able to push this card slightly higher than the XFX model that I reviewed. An increase of 126 MHz on the GPU core and 176 MHz on the memory are pretty stout overclocks. These speeds represent an increase of almost 18% on the GPU core and almost 14% on the memory. While not as over the top as the 9800GTX, there is definitely significant head room to play with. Does this increase in GPU and memory clock speed equate to similar performance increases? I think it's time to find out.

http://www.overclockersclub.com/reviews/palit_gtx280/