|It requires two 6-pin connectors, actually.|
Since there's little difference in price, grab the 9800GTX. It's around 3x faster than the 7800GTX in raw speed, and more capable (DirectX 10, the ability to run CUDA applications, HD video bitstream decoding, etc.).
Samsung 1080p panel
2 HDMI, 2 Component, 1 VGA
120" 16:9 screen
Connected to: HTPC w/ BD, satellite receiver, XB360.