Offhand, it won't make that much difference. The idea behind octagon is to assure the connection is more secure and/or not so movable. The other half of this is the laptop own connection is made to grasp the octagon as a spring loaded mechanism. However, if the AC charger states it for your model# then I wouldn't worry. If on the other hand it becomes an issue it doesn't seat well, then return it before an damage can be done or you feel unsure of its effectiveness.

tada -----Willy Happy