Remember liquid cooling is the movement of heat from a
hot object to another object which itself is still cooled by fans.

Reason being that temperatures are not huge, and so the temp
delta between ambient & water isn't so great that you could get
away with a reasonably sized convection stack.

What it does allow is an improved enclosure for the radiator:
o No reason not to mount the radiator separately in a ply cabinet
o Use a simple perforated metal or mesh front/rear grill on it
o Baffle in front of & behind the fans inside re noise
o Use several small low-noise 80mm or 92mm fans
---- or 120mm - depends on your radiator size
o Consider using proper oil coolers re size/quality
---- Mocal & Earl come in 115mm & 235mm width
---- the 235mm will take 3x 80mm fans ok
---- you can vary the height from 5-57 rows, matching # fans

This allows the very-remote location of the unit from the PC/user.
So whilst water cooling is an extra step between heat / water / fans,
it allows you to add distance and even utilise the heat more effectively.

Remember a few things tho:
o Quality re pump
o Large bore tubing
o Anti-bacterial in the water system
o Simpler is better

You can get a silent system with fans - it just takes a bit of effort,
and case makers could do more to help with their designs. For an
overclocking system, that's a different requirement re exponential
cooling need to achieve beyond original clock-speed performance.
--
Dorothy Bradbury