The difference between the noctua and the 212 is HUGE!!Of course you could overclock your cpu higher with that hsf but i dont think that upgrading to a 3770k would make a real difference in gaming. Get the noctua and try to overclock your 3570k to about 4.7Ghz and it should be better. But are you sure that all cores are running at 4.2 under 70% load while your gaming?
Yes all cores are running when under 4.2. I'm not sure why this game is so heavy on the processor, but unfortunately it is. If the 3770k won't be a noticeable difference -- what can I do to lessen the load on my processor?
Hitting 4.7GHz on a Ivy Bridge CPU even with amazing cooling is not an easy task. I don't think I know of anyone who has hit 4.7GHz, not that it's impossible, just difficult.
You're CPU usage is fine for gaming, even if it's CPU intensive. On BF3 my usage is 80-90% in 64 player games. The CPU upgrade wouldn't even be even be noticeable. If you want to get a better cooler and try, it's your business, but I think you're just fine.