Performance NVIDIA GTX 680 1536 CUDA Cores 1058 MHz GPU 1124 MHz Boost Clock Memory 2048 MB 256 bit GDDR5 6208 MHz (effective) 198.66 GB/s Memory Bandwidth Interface PCI-E 3.0 16x DVI-I, DVI-D, HDMI, Display-Port SLI Capable Resolution & Refresh 240 Hz Max Refresh Rate 2048x 1536 Max Analog 2560x 1600 (Dual Link DVI Only) Max Digital Operating System Support Windows 7 32/64bit, Windows Vista 32/64bit, Windows XP 32/64bit Requirements Minimum of a 550 Watt power supply. (Minimum recommended power supply with +12 Volt current rating of 38 Amps.) Two available 6-pin PCI-E power dongles