Quiet CPU Cooler that uses stock mounting?

[popatim]

My two htpc's cpu fans are too noisy for my tastes and would like to change out the coolers for a quiter one.

The AMD, is in a HTPC desktop case and could accomodate a wide cooler but not a very tall one.

The Intel system is mounted in an old VCR I modded and has plenty of room but a 120mm fan, like the hyper 212, might be too tall.

Neither case has a motherboard tray or access to change the stock mount unless I completely disassemble them and thats why I'm looking for quieter coolers that use the stock mounting. Neither one has heat issues, just noise.

 

[amuffin]

http://www.newegg.com/Product/Product.aspx?Item=N82E16835608016
http://www.newegg.com/Product/Product.aspx?Item=N82E16835608019
Or replace every single fan with noctua ones

 

[popatim]

Thanks for the links but neither of those use the stock cooler mounts.
All the other fans are quiet, its just the cheap stock cpu fans thats left.