AMD Radeon HD 6870 X2 Specs | TechPowerUp GPU Database
XFX AMD Radeon HD 6870 1GB DDR5 PCI Express 2.1 x16 CrossFireX Support – Computizer
Meet The Radeon HD 6950 1GB and XFX Radeon HD 6870 Black Edition - AMD's GTX 560 Ti Counter-Offensive: Radeon HD 6950 1GB & XFX's Radeon HD 6870 Black Edition
XFX Radeon HD 6870 Video Card HD-687X-CNFC - Newegg.com