Same performance, different features. FX has no Integrated GPU the GX does have an Integrated GPU. That's it in short. What you want is a board that has the SB750 and decent Bios support. The big four (Foxconn, MSI, Asus, Giga) and other smaller manufacturers (DFI, Biostar) are all commonly used here. For a cheaper option the Biostar 790GX DDR2 boards are a good buy, for the FX boards I'd recommend my DFI board (last time I checked the Asus and Foxconn were overpriced for no reason) and for DDR3 I'd say the Giga 790x for around $100 and for High end the MSI GD70 is arguably the best atm. Some of the FX boards have a beefier power regulation system so might prove slightly better in overclocking but on average the GX is definitely a solid board even for overclockers.