The ATI Radeon HD 3870 X2 video card (known internally as the R680) was first seen by the world right here on Legit Reviews a few months ago and was again spotted at CES 2008, where the the retail card was seen. Everyone knew that the launch was close, but today is the day that the card is officially announced. The ATI Radeon HD 3870 X2 is a single-board with multiple-GPUs on it, which is why the card is so interesting.

Quote "The core frequency on the R680 is higher than that on an RV670, which is a shocking move. The ATI Radeon HD 3870 has a core clock of 775 MHz while the ATI Radeon HD 3870 X2 has been increased up to 825 MHz. This might have been down as the memory clock was decreased from 2.25GHz GDDR4 to 1.8GHz GDDR3. The ATI Radeon HD 3870 X2's cooling fan operates at 36dBA, which is just slighting higher than the 34dBA seen on the Radeon HD 3870. The boards peak power usage is also 91W higher than the Radeon HD 3870 at 196W under full load. Having two RV670 cores on one board doubles many things like the frame buffer size and the math processing power, but the power consumption does not double."



Link: Legit Reviews