Just sharing a (read: ONE) way to solve a problem with the Feed The Beast modpack running out of memory. (NOTE: This might only work if you run a 64 bit operating system.)
The problem:
Feed The Beast running out of memory, even tho you have 4/8/16/XX Gb ram, and the option to adjust memory usage is maxed out at 1Gb.
The solution I found, was to download the correct version of Java. The 64 bit one, not the 32 bit version which you already have.
Simply go to java.com/en/download/manual.jsp , (Direct Link), chose the "Windows Offline (64bit)" version, and install it.
The next time you fire up Feed The Beast, you should have the ability to adjust the memory usage to your liking:
This fixed the problem for me. It might not fix it for you, but it is worth a try.
Enjoy!
myZx
Link: http://feed-the-beast.com/ - The Feed The Beast modpack website
