What is the Difference between the 3300V and the 3300V+ DrayTek2019-09-11T00:47:49+00:00January 17th, 2012|Getting Started| They have the following differences: Vigor3300V+ supports ISDN, Vigor3300V doesn’t support ISDN. Vigor3300V+ has 128M of memory, Vigor3300V has 64M, The CPUs of both models are the same. Share This Story, Choose Your Platform! FacebookTwitterLinkedInRedditWhatsAppTumblrPinterestVkEmail