Feed the Beast pack using more memory than allocated

[enthnal]

I run win7 6gig of RAM. Allocate 3gigs to minecraft when running FTB so with windows using roughly 1.5gigs I'm at 4.5 upon start up. Thirty minutes into playing, I've watch my allocated memory go above and beyond that 3gigs to 4.5gigs. Completed gutted FTB and ran with a fresh copy of minecraft over a period of 4 hours the same memory issue does not occur. Any ideas?

 

[Ashzification]

Please follow these steps exactly: http://desk.feed-the-beast.com/index.php?/Knowledgebase/Article/View/9/0/basic-troubleshooting
This is to rule out any issues with your client setup.