Use the Edit button. Dont double post.
DVI-D - True Digital Video (White port)
DVI-D format is used for direct digital connections between source video (namely, video cards) and digital LCD (or rare CRD) monitors. This provides a faster, higher-quality image than with analog, due to the nature of the digital format. All video cards initially produce a digital video signal, which is converted into analog at the VGA output. The analog signal travels to the monitor and is re-converted back into a digital signal. DVI-D eliminates the analog conversion process and improves the connection between source and display.
DVI-A - High-Res Analog (Blue port)
DVI-A format is used to carry a DVI signal to an analog display, such as a CRD monitor or and HDTV. Although some signal quality is lost from the digital to analog conversion, it still transmits a higher quality picture than standard VGA (now i see what you meant by VGA).
And out of those two cards, the 4870 is a clear winner. Demolishes the GTX+ in all games.
The 4870 competes with the nVidia GTX260....