A Dutch reseller listing and additional leaks suggest that AMD is not only planning a new 4900 series but that one of its Radeon 5-series cards may be a dual-chipset card. Showing as the ATI Radeon HD 5870 X2, the card appears to be a higher-clocked version of the 4870 X2 with each individual core speed climbing from 750MHz to 800MHz while the memory makes the biggest leap from 3.6GHz to 4.8GHz w
