What is mean Burst RAM ?
Basicly, You bought 128 MB guarantee RAM and 384 Burst RAM. that’s mean, you had 128 MB RAM all the time. Suddenly your web site or your apps is getting unexpected hit from internet and you need more RAM, at this time you can use your Burst RAM for while if your hosting provider had available RAM your present your VPS as Burst RAM.
resource : http://www.emrullahekmekci.com.tr/?p=203
