GIGABYTE Radeon HD 6770 1 GB GDDR5 PCI Express 2.1 DVI-I/HDMI/Displayport CrossFire Ready Graphics Card Gigabyte Ultra Durable VGA Series - GPU Temperature 5% ~ 10% down - Overclocking capability 10% ~ 30% up - Power Switching Loss 10% ~ 30% down GIGABYTE custom-designed large 100mm Fansink for maximum performance at whisper silent operation Gold plated HDMI for optimum signal transfer between connections Core Clock: 775MHz - Memory Clock: 4000MHz Features DVI-I / HDMI / Displayport outputs with HDCP protection Supports AMD Eyefinity / EyeSpeed / CrossFire / Avivo HD technologies Minimum Recommended Power Supply 450W with one 6-pin PCI-E power connector