The Radeon HD 6870 takes up two slots and has a 256-bit memory interface, 1GB of GDDR5 VRAM, the third-generation Unified Video Decoder (UVD), AMD HD3D technology for 3D gaming, CrossFireX support, and the Eyefinity multi-monitor solution. The card also provides no less than five display outputs - two DVI, one HDMI 1.4, two mini DisplayPort 1.2, so it seems capable of running five monitors simultaneously. Pretty sweet right?
Source: TC Mag