120mm fans.

[amjedm]

Sawyen - which model of the S-Flex have you tried? I thought the E had the best performance ratio?

[Pob255]

Well the only S-FLEX I've got/used is the 800rpm it's deffinately the most slient fan I've ever (not) heard, but the air flow is absolutly pants.
The 1600rpm version should be far better.

I've got one of the Sharkoon Power system fans and I can say that reduced down to minimum with my fan controller (about 1000rpm) it can still be slightly heard but still feels like it pushes more air than the 800rpm sflex