Every card is different. Two cards right next to each other in the factory line will overclock different. Just go up in short jumps by 25mhz until the card starts crashing. Then just back the clock off a little until it stabilizes. You have to find your own stable clock. There's no way for anyone to tell you what it is. Some people can get 100mhz over, some can't break 50mhz. As for the memory, the average clock is 300-500 mhz over. I was lucky and could get 550mhz over.