Guaranteed RAM is RAM that is always available to you and guaranteed. Burstable RAM means that while you are always guaranteed a certain amount of system resources, far more is available on each node than simply these guaranteed resources. Hence, should your load spike higher than your guaranteesd as long as the resources are available on the node at that time, you can use them, up to your burst level.
We make sure that an ample amount of burst resources are always available on each host machine. You cannot count on constant, sustained utilization of your burst resources. If your VPS constantly requires greater resources than your package guarantees, we can wo