AMD Hawaii came in late 2013 with a 512-bit memory interface, which was surprising, but the card did quite well against Nvidia's Kepler-based Geforce 780 TI in the high-end.
Cannot fit more on 2.5D interposer
In early January we heard a thing or two about an AMD card codenamed Fiji, the one that comes with High Bandwidth Memory (HBM).
100 MHz faster, Computex-ish launch
We have reported that Kaveri gets a desktop refresh but apparently due to ambient noise at the noisy CES, we didn’t catch the right name.
Quad-core APU with Radeon R7 graphics
Reference all the way
Full specifications and general performance detailed
Windows of course
Same clocks, better cooler
Comes with a single 6-pin PCIe power connector