ASUS Extreme AX1800XT TOP/2DHTV 512 Mb PCI-E, GDDR3, 256 bit, 2048 x 1536 pixels ASUS Extreme AX1800XT TOP/2DHTV 512 Mb PCI-E. Processor frequency: 700 MHz. Graphics card memory type: GDDR3, Memory bus: 256 bit. Maximum resolution: 2048 x 1536 pixels