FL studio 11 is clipping while using ASIO4ALL v2 and only one plugin is running (Harmor). other huge projects are not clipping, only this project I've just started. I have 8BG RAM and intel core i5 3470, this is strong enough?

I'm no expert... But I have a feeling it's the CPU usage that's causing the clipping. I think FL Studio has a little bar thing to show you how much CPU the program is using. And there are ways to optimize it apparently.

If you're interested in learning more about the relationship between CPU and RAM, then this might do the trick: http://superuser.com/questions/78362/what-is-the-relationship-between-cpu-usage-and-ram