Palit GTX 570 Sonic Platinum
 

Before I touched any of the clock speeds, I instantly increased the voltage and the fan speed as high as they would go. I then started increasing the core and memory clocks in increments of ten. After the core clock had gone 100MHz past its original clock, I was expecting problems, but none came. In fact, I was able to continue increasing the clock speed above 990MHz! I must admit I was not expecting this. In my excitement I decided to try and bring the core clock up to an even 1GHz. Sadly, I was instantly greeted with a system crash the moment I tried to run a benchmark. After this, I began lowering the core clock until stability was regained. I then began to fine tune the memory clock. In the end, I was left with a core clock of 993MHz, a memory clock of 1130MHz, and a shader clock of 1986MHz. I must say, I was extremely impressed with this card.

http://www.overclockersclub.com/revi...onic_platinum/