Terrabytez wrote see, I don't enjoy the game for making ultra space missions, i enjoy simply blasting Kerbals into space and landing them on the mun, to then get blasted back to home.

But after launching 3 200 part rockets and having them crash for some reason there was no lag.

But I may add that KSP is not hard to run.

"2.0Ghz Dual Core CPU or higher (preferably higher)
4GB RAM
512MB Video Card, Shader Model 3.0
1GB Free HD space* Windows XP, Vista, 7 or 8
An Intel-based Mac running Mac OS X 10.6 or higher
A Debian based Linux distro"

No - it's really easy to run.

Also, people enjoy it for different reasons - i have only ever said that to enjoy it to the level which most people eventually want to attain, you need something around an i5.

Because OP stated it as 1 of 2 games, we must assume he wants to play it to this kind of level.