ASUS Sabertooth X99 40mm Little Fan Replacement?

Hey guys wondering if there is a better fan to replace the one in the ASUS Sabertooth X99 with one that generate less noise?

I only came across these fans from Noctua.

NF-A4x10 FLX
http://noctua.at/en/products/fan/nf-a4x10-flx

and

NF-A4x10 5V
http://noctua.at/en/products/fan/nf-a4x10-5v

Not sure which is best or if there is a different fan to get out there that is better.

Thanks!

Turn it off...really isn't needed in the first place.

EarthDog said:

Turn it off...really isn't needed in the first place.

Click to expand...

No.... I don't want to. Is a cute tiny little fan. My daughter would be sad to see it off or removed.