Thanks for the tips so far.
After running CPU-Z it turns out my CPU is a C0/C1 revision, so i can't go that high

The case is not anything spectacular but it's roomy and has space for a couple of extra fans, so i think that i could create some proper air circulation if i wanted to overclock.
The good thing is that even this way, it looks like i can safely get it over 3Ghz without spending too much. I don't think i'd run it as high as 4Ghz even if i had a D0 CPU. We have really hot summers where i live and the PC is in a small room without air-conditioning, if the PC doesn't fry during the summer i will from all the heat build up

I think 3.5Ghz would be good enough for me.
I guess that i could spend 100 Euros on an aftermarket cooler and 1-2 case fans and go for it if SoW happens to give me trouble. On the other hand, i could maybe sell my C0 revision CPU and get a D0 one