No, that's individual core clock, and memory clock is x2 on nvidia cards which has to do with bus width Im fairly sure. Radeons are x4 but have lower clocks per bus..width. 1500mhz = 6000mhz on the radeons 256bit bus... Without using google at all...that's how I have assumed it works lol. it all seems like smoke and mirrors to me, half the width but twice the speed, twice th3 with half the speed... because cards from both brands perform quite similarly at a given price point and can go tit for tat depending in whats thrown at them.