Gigabyte GT 640 DDR3 2GB 2xDVI/D-SUB/HDMI OC Graphics Card GV-N640OC-2GI Rev2.0 Gigabyte Ultra Durable 2 Components - Ultra Cooling Low RDS(on) MOSFET Design - Low Power Loss Ferrite Core Chokes - Longer Life All-Solid Capacitor Design Gigabyte Custom-Designed 100mm Fan sink for maximum cooling efficiency and whisper silent operation. Core Clock: 941MHz - Memory Clock: 1800MHz Features 2 x DVI-D/HDMI/D-SUB outputs with HDCP protection Minimum Recommended System power supply 350W