No...no...NO! Do not buy this fan, it's a piece of junk. The 8cm & 12cm aren't so bad but this particlular model is terrible. It emits a low frequency noise that's bothersome AND it doesn't move much air at all.
There are two kings in the fan game Panaflo & Papst. Papst is expensive and IMHO the best value is Panaflo. Move good amounts of air & are very quiet. They are also durable, I have a couple that are WAY past 3yrs of 24/7 use (one is actually over 6 years, it was recently retired but may go back into service in my canopy)
Panaflo @ Directron
For Panaflo's the last three char's tell you the speed/noise. L1A = low speed/noise, M1A = medium, & H1A = high (regardless of the size).
As fans get bigger they move more air/noise produced. The larger fans need to spin @ lower rpm's to produce the same airflow - this means less noise.
You don't need a holesaw to cut a 12cm hole, a jigsaw will work fine. A template is easy, use a CD it's the same size.
Also, as Xeon mentions you can use an ATX PS, just be advised that some of them don't like being run w/o a load (jumped grn/black). They make PS testers for this, about $11 - $12.
I think I might have a spare 9cm Vantec laying around if you REALLY want one of those (I might just have tossed it out also - ).
If you have any Q's about PC fans give tag me w/ a PM. I've spent more time in the last 8 years d*cking around w/ fans than any sane person should.
EDIT:
To give you an idea how much of a rip RS fans are - the Panaflow 9cm is $7.99 @ Directron.
sph: fixed link