It's a real bad idea to mix RAM of different clock speeds, I doubt you could get it to POST at all. The system can't run with some of it's RAM running at a different speed than the rest of it.

Really it's not even reccomended to run RAM off different sizes or even different brands, … Read more

Minecraft

Destiny

Five nights at freddy's

World of Warcraft

Heroes and Generals

Slender

League of Ledgends

Hawken

Only a few i recommend them all

So many different things could be going wrong here... The mod could be crashing, your network could be faulty, give me more info... What mods? What version of minecraft? What is your router brand name? What operating system does your computer run?

Hope I can help... Mod crashes are my worst enemy as well