The SAPPHIRE Vapor-X Radeon HD 4890 2GB GDDR5 PCI Express 2.0 video card is one of the fastest single slot graphics cards on the market today. This versatile and powerful card has 2GB of high-performance GDDR5 memory running at 1050MHz, while the core operates at 870MHz. Read on to see how this factory overclocked card does on out 30" display.