Title 14, Chapter 2, Section 727
(a) The articles of incorporation or a bylaw adopted under Code Section 14-2-1021 may provide for a greater or lesser quorum (but not less than one-third of the votes entitled to be cast) or a greater voting requirement for shareholders (or voting groups of shareholders) than is provided for by this chapter.
(b) An amendment to the articles of incorporation or bylaws that
changes or deletes a greater quorum or voting requirement must meet
the same quorum requirement and be adopted by the same vote and
voting groups required to take action under the quorum and voting
requirements prescribed in the provision being amended.