Seen below, PowerColor's Barts-powered offering has a custom, dual-slot cooler, 1120 Stream Processors, a GPU clock of 900 MHz, a 256-bit memory interface, 2GB of GDDR5 memory (double the amount found on 'regular' HD 6870s) set to 4200 MHz, and six mini DisplayPort outputs allowing to connect it to six monitors. The PowerColor HD6870 2GB GDDR5 Eyefinity 6 Edition also has CrossFireX support and requires extra power via two 6-pin PCIe connectors.
Source: TC Mag