My modded minecraft freezes after 30 minutes of playing?

I use forge mod loader for 1.7.10, and I have a pretty new Mac Desktop. I also minecraft 5 G of Ram. I play on fast graphics with no smooth lighting. I only have 13 mods. But after 30 min of playing my game freezes, causing me to restart me computer. This happens immediately whenever I install more mods as well, it loads the world and then freezes. I'm pretty sure that I have the right Java version as well (64 bit) Help!

Current Mod List
OreSpawn
BetterFps
Buildcraft
Buildcraft Additional Pipes
Applied Energistics 2
Tinker's Construct
Extra Utilities
Archemidies Ship
NotEnoughItems
Mantle (Required for TC)
CodeChickenCore (Required for NEI)

Thanks

Added (1). Sorry I want to add that I want to be able to Install MORE mods without it freezing

You should take away some of those mods. If they are affecting your game they can soon affect your computer.