how do allocate more Ram

[Automation2000]

I have been playing on ftb for a while but recently when the 1.6.4 packs ccameout I had to download java 64bit to allocate more ram but I could only allocate 2.5gb and I need to have more.if anyone knows it would be a great help.

 

[Yusunoha]

I have been playing on ftb for a while but recently when the 1.6.4 packs ccameout I had to download java 64bit to allocate more ram but I could only allocate 2.5gb and I need to have more.if anyone knows it would be a great help.

I present to you the world of JVM Arguments http://forum.feed-the-beast.com/threads/jvm-arguments-for-modded-minecraft-updated-12-30-13.28994/