Heatsink removed – the 6870 X2 uses two 40nm Northern Islands VLIW5 based Barts XT (6870) and is clocked at 900MHz at stock.

P1020836 Club3D Radeon HD 6870 X2 Review   Two Barts XT go against the big boys

A Lucid LT22102 PCIe bridge chip (48 lanes Gen 2) is used for onboard Crossfire communication between the two GPUs

P1020837 Club3D Radeon HD 6870 X2 Review   Two Barts XT go against the big boys

 

16 x ELPIDA 128MB GDDR5 clocked at 1050MHz by default

P1020833 Club3D Radeon HD 6870 X2 Review   Two Barts XT go against the big boys

 

For voltage regulation, the 6870 X2 is equipped a pair of CHiL CHL8214 (4+1 phase) PWMs, which supports voltage control/monitoring by I2C bus

P1020842 Club3D Radeon HD 6870 X2 Review   Two Barts XT go against the big boys

CoolStream Cooling System

P1020835 Club3D Radeon HD 6870 X2 Review   Two Barts XT go against the big boys

Actually made of 2 separate heatpipe blocks. Fans are made by Everflow (75mm T128010SU 0.35A@12v and 83mm T129215SU 0.5A@12v)

P1020847 Club3D Radeon HD 6870 X2 Review   Two Barts XT go against the big boys