Does size of fan determine noise level?

Hi all, just wondering if anyone can verify whether the size of a case's fan determine's its noise level. My current PC, which is old as dirt is pretty loud and I'm planning a brand new system and hope to keep performance high, while keeping fan noise low.

I'm looking at Antec's P-160 case, which as 120 mm fans vs. the 80 mm fans in their other cases. Just wondering if the noise level from 120 mm fans could be expected to be louder or quieter than other sizes.

Thank you for any insights.

Actually it is a combination of factors, and fan blade design plays a large part in it.
But for the most part, a larger blade area can turn fewer RPM's to move same amount of air as a smaller fan at higher RPM's and thus do it quiter.

<pre><font color=red>°¤o,¸¸¸,o¤°`°¤o \\// o¤°`°¤o,¸¸¸,o¤°
And the sign says "You got to have a membership card to get inside" Huh
So I got me a pen and paper And I made up my own little sign</pre><p></font color=red>

It's how you use it

______________
OK it's your choice:
You can have the boat, or you can have the Mystery Box!
...Hey wait a minute! A boat's a boat, but a Mystery Box could be anything. It could even be a boat

Thats right, its how Ned uses it.