The 790GX chipset motherboard's feature onboard video.. The 890FX is current the top of the line chipset for AMD boards.. It does not feature any onboard video though.. It features full scale (16X + 16X) support for atleast two video cards in Crossfire and has better overclocking potential and features.. Also, its a native AM3 chipset supporting DDR3 RAM only whereas the 790GX is an AM2+ (AM3 ready) chipset with boards supporting DDR2 RAM as well..