CPU fan rattles on mid RPMs.

[Smag]

Hi all.

I'm using a Thermalright TRUE Spirit 140 (BW) Rev.A to cool my Skylake 6700K.
On mid RPMs, or before it drops or increases the speed, the fan rattles. Not on high, it's pretty quiet on high RPMS, which is kind of strange.
Because my Corsair Carbide Series SPEC-03 has a width difference in the middle and on top/bottom (the width is less on the very top/bottom), I had to mount the heatsink parallel to the video car, not to RAM (the heat pipes on top blocked me from slosing the panel). The CPU fan looks down, just like the GPU fan, and sucks in the air upwards.

So a couple of questions:

1) What could be the cause? The akward fan positioning compaired to ideal (looks down instead of the side) or the fan has a flaw?
2) Could this be fixed with rubber dampers between the fan and the heatsink. I forgot to install the ones that came with the fan, but it didn't sound like that before, the built is barely a month old?
3) If it's the fan, can I use any 140x140 compatible case fan with a 4-pin connector and just strap it to the heatsink? I've never thought about this, are CPU fans any different from case fans? What bearings type should I look for?

Thanks.

 

[awesomedude911]

I would try turning your fan to the side or upward because I don't think they intended the fans to face downward.
try seeing if its the fan and not something else.

Noctua has good fans, Corsair is a little cheaper, basically your looking for double ball or sleeve.

 

[Smag]

I would try turning your fan to the side or upward because I don't think they intended the fans to face downward.
try seeing if its the fan and not something else.

Noctua has good fans, Corsair is a little cheaper, basically your looking for double ball or sleeve.

Turning it sideways is not an option, because the heatsink pipes will block the side panel from closing. It's why I turned it in the first place. As for putting it face up - don't know about this because it will then blow on my 980Ti.

Agrrrhhh!

The only thing I can do right now, without changing the fan, is to make the fan curve go straight to 1000-1100 RPM on load. OR Just buy a Noctua with SSO bearing.