They are the same specs right? Will I need more than 4gigs of ram?should I add more?
Both are the same, just marketed to two different stores, and as for extra memory, more then 6 GB is more for heavy users, running a game like Call of Duty MW3 and a 10 tab browser, or running photoshop. 4 GB is fine for most users, unless you plan to run something heavier.
4GB vs 8GB:
8GB is only a benefit to: - gamers - advanced photo and video editing
*When you ask whether you need more than 4GB of RAM you really need to specify the use of the computer. Even light gamers won't see a benefit to more than 4GB.