What do you mean by ‘burst RAM’?

Many are unaware of the concept of a burstable RAM. So, here is a short description of Burstable RAM. Burstable RAM is the memory that is available beyond the guaranteed RAM. If a VPS hosting plan offers a guaranteed RAM of 256 Mb and 1024 Mb Burstable RAM, then it means if a client uses all of the 200 Mb RAM which is the guaranteed ram, s/he is still left with 824 Mb burstable RAM for the burst usage, with a condition that the host server has enough free memory.

Bursting means that while you are always guaranteed a certain amount of system resources, far more is available on each box than simply these guarantees. Hence, should you require your loads to spike higher than your guarantees, as long as the resources are available on the box at that time, you can use them, up to your ‘burst’ level. We are constantly monitoring the loads of each server to make sure that nothing is oversold, and that customers always have their guaranteed resources.We make sure that an ample amount of burst resources are always available on each host machine. Your burst allottment is not the same thing as your resource guarantee. You cannot count on constant, sustained utilization of your burst resources. If your VPS constantly requires greater resources than your package guarantees, we can work with you to quickly upgrade you to a package with greater guaranteed resources.

Generally, a reliable and professional web host leaves some extra memory available on every host server as burstable RAM. Burstable RAM is provided to the users of Virtual Private Servers (VPS). Every VPS is assigned a guaranteed amount of RAM that is available all time. Burstable RAM proves to be really useful when there is a sudden high usage or high traffic. Burstable RAM is not in use by any VPS server so it can be allocated to any VPS which may need it till it is available. Users can use this resource as long as it is available.

Refer the following link to check the Burstable RAM allocation for Linux VPS Hosting server.