EVGA GTX 770 4GB GDDR5 Dual DVI HDMI Display Port PCI-E Graphics Card Performance: NVIDIA GTX 770 1536 CUDA Cores 1150 MHz Base Clock 1202 MHz Boost Clock 147.2GT/s Texture Fill Rate Memory: 4096 MB, 256 bit GDDR5 7010 MHz (effective) 224.32 GB/s Memory Bandwidth Interface: PCI-E 3.0 16x DVI-I, DVI-D, HDMI, Display-Port Resolution & Refresh 240 Hz Max Refresh Rate Max Analog: 2048x 1536 Max Digital: 4096x 2160 Operating System Support: Windows 8 32/64bit Windows 7 32/64bit Windows Vista 32/64bit Windows XP 32/64bit Requirements Minimum of a 600 Watt power supply. (Minimum recommended power supply with +12 Volt current rating of 42 Amps.) Two available 8 pin PCI-E power connectors Total Power Draw: 250 Watts