Make sure that you have the following java arguments enabled in your technic launcher. Also set the Memory to at least 3 GB. Also strictly use Java 8! Without them the Modpack won't run!
Go to Launcher Options, Java Settings and paste them into Java Args. -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M -XX:PermSize=512m -XX:MaxPermSize=1G
Minecraft crashes at loading? Delete the shaders mod from the mods folder.
Where do I get shaders from and do you recommend one? The SEUS shader is the most well known and looks beautiful. The CUDA shader also looks beautiful but has some motion blur at lower FPS.