Basically what happened was that I loaded up feed the beast (direwolf20) and went into singleplayer. This was my first time playing feed the beast and my friend told me to use direwolf20. I created a new singleplayer world and entered it. I broke a few pieces of logs then it froze then crashed saying:"Shutting Down Internal Server" or something like that.
It looks like the world is being overloaded. How much RAM is allocated to Minecraft? For Feed the Beast, I suggest about 2.5 gigabytes for singleplayer.
This is what it said in the console(couldn't find crash log): http://pastebin.com/jYSjFquJ
Thanks for reading!
http://www.minecraftforum.net/topic/1883980-minecraft-maps/
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My current setup:
http://pcpartpicker.com/p/Q7wqf7