Is a fan cooler for the CPU necessary?

I have ordered a PC with a core i7 2.66 and was wondering if an aftermarket fan cooler to sit on the CPU totally necessary?

Or will the case fan do it's job good enough?

Sorry but I am new to the PC gaming scene after consoles not satisfying my RTS addiction.

a CPU cooler is absolutely nessisary, it willl fry with out one esspecially an i7 they need one with a fan preferable a good aftermarket if you care alot about temps or overclocking or water cooling if you have a the money

If it doesnt have one with it you need to buy one, but it should.

A heatsink + fan is required. If this is a name-brand system, one will already be installed for you. If you are putting it together yourself, check the processor you bought to see if it comes with one (as mentioned before, all retail-boxed procs will have one)

the retail box has the crappy intel heatsink inside.....if you want to overclock you need to replace it