FreeBird2k :
How does HIS 7750 video card work on this AMD APU motherboard? The mobo is PCIE 2.0 and the GPU is PCIE 3.0...
PCI-e 3.0 is backwards compatible with PCI-e 2.0 and was designed so you can insert a PCI-e 3.0 card in a 2.0 system and have it work. The difference between the PCI-e 3.0 and PCI-e 2.0 is the amount of information that can travel over each PCI-e lane.