The new SAPPHIRE HD 7700 series is a new family of graphics cards targeting the enthusiast on a budget & mainstream users looking for increased graphics performance. It is based on the second family of GPU’s from AMD built in its new 28nm process & featuring the highly acclaimed GCN optimised graphics processing architecture. Specifications GPU 1000 MHz Core Clock 28 nm Chip 640 x Stream Processors Memory 1024 MB Size 128 -bit GDDR5 4500 MHz Effective Output 1 x Dual-Link DVI 1 x HDMI (with 3D) 2 x Mini-Display Port Display Port 1.2 Dimension 210 (L)x 110 (W)x 43 (H) mm Size.