A motherboard is hardware that allows your CPU,RAM, GFX and storage/optical drives to communicate. The only bottlenecking you should encounter is with the previously mentioned components that attach to the motherboard. For regular use a budget motherboard is acceptable. For overclocking with a suitable overclockable processor you will need to pay a small premium to get a capable motherboard. For gaming, no motherboard should cost more than the GFX card you put into it.