ASUS Extreme N7800GT/2DHTV, GDDR3, 256 bit ASUS Extreme N7800GT/2DHTV. Graphics card memory type: GDDR3, Memory bus: 256 bit The Asus Extreme N7800GT/2DHTV is an excellent graphics card, but this is purely down to the fact that it uses Nvidias GeForce 7800 GT GPU. Unfortunately for Asus, the N7800GT/2HDTV doesnt distinguish itself from every other 7800 GT weve tested and ... The Asus Extreme N7800GT/2DHTV is an excellent graphics card, but this is purely down to the fact that it uses Nvidias GeForce 7800 GT GPU. Unfortunately for Asus, the N7800GT/2HDTV doesnt distinguish itself from every other 7800 GT weve tested and ...