HIS X1550 iFan 256 MB (64 bit) DDR2 Dual DVI PCI Graphics Card 550 MHz graphics card powered by ATI Radeon X1550 for PCI bus slot 256 MB, 64-bit 4 channel DDR2 memory 2560 x 1600 maximum resolution Dual VGA and DVI output; component TV output ATI Avivo technology