EVGA GeForce GTX 550 Ti FPB 1024 MB GDDR5 PCI Express 2.0 2DVI/Mini-HDMI SLI Ready Graphics Card, 01G-P3-1556-KR GeForce GTX 550 Ti with 951 MHz core clock Interface: PCI-E 2.0 16x, DVI-I, DVI-I, Mini-HDMI and SLI Capable 1024 MB 192-bit 0.5ns GDDR5 memory 4356 MHz Effective Memory Clock and 1903 MHz Shader Clock 104.5 GB/sec Memory Bandwidth. Minimum 400-watt Power supply and 1 6-pin PCI-E Connector Required.