Base went from 1x to 3x.
E.g. Without XP server boost, the Flame Drake NPC killed with XP Rune 200%, Erupting Vitality 100%, XP Buff 50%, and Freya's Ice Rose 30% = 1,309,670,386 XP.
E.g. With 200% XP server boost, the Flame Drake NPC killed with XP Rune 200%, Erupting Vitality 100%, XP Buff 50%, and Freya's Ice Rose 30% = 3,929,011,158 XP.
Makes sense?