GPU Fan Rattling/Clicking Noise Simple Mod/Solution.

I was having a rattling/clicking sound with a new GIGABYTE™ GeForce GTX 1080,
when the fan speeds were set between 60-75%.Upon further inspected of the card.
I noticed a small space,
(about 1 to 1.5 mils) between the plastic fan mounting brackets and the heatsink. This is to say,
that the rattling/clicking sound was being produced by the fan mounting brackets,
making contact with the heatsink.
To remedy this,
I used a small piece of adhesive-backed felt,
folded in half, (adhesive sides of felt folded together).You can use something other then felt,
but it needs to be soft and fit snugly between the brackets and the heatsink.Without causing any undue stress on the brackets.
This is why I chose to use felt.
This small piece of soft felt folded onto itself,
was just thick enough to add the right amount of pressure against the mounting brackets and the heatsink,
without causing any dislocation of the brackets themselves,
or putting the fans out of level.
Doing this creates a small wedge of soft felt,
between the plastic mounting brackets and the heatsink.There's also no disassembly required,
other then removal of the GPU to preform this operation.I used a hobby/X-acto knife,
to gently slide a small piece of felt,
between the fan brackets and heatsink of each fan.
Only 3 small pieces of felt,
as described above.
Was use for this processes.After doing this,
there's no more clicking/rattling sound,
at any fan speed coming from the GPU.

Below is a graphic I put together.
As an example of what was done.

FastFred said:

It shouldn't be doing this in the first place, send it back for warranty.

Good fix though, I've used bits of foam when I was placing an SSD in a Asus K95VJ notebook and the space between the SSD and the cover was to big it caused the SSD to move around and bend the SATA connectors. Bit of foam 1cm thick was the perfect fix. Either that or pay for some sort of bracket from Asus

This seems to be a design flaw, which is prevalent in many GPU manufactures cards.
I've already received my RMA replacement card and this card as well, made the same noise.
That's why I chose to take matters into my own hands.
It's a very simple solution, to a somewhat overlooked GPU issue. Which won't effect the cards warranty, or damage anything.
This issue seems to affect many kinds of GPU's. I've done a lot of research into this problem and have yet to see the simple mod/solution I employed. Discussed, or even alluded to as a possible fix.
Although I've read many other "so-called" fixes,
which seemed like drastic measures, when compared to what I did.
It's unfortunate that none of these "fixes" solved the issue.

This did work for me,
but I can't say that this will work for every card and in every situation.

The only real concern I have, is the quality of the materiel used as a vibration buffer/pad.
I just happen to have 100% Merino Wool felt on hand, which was for another project.
Is this the correct kind of felt/materiel? I don't know.
My guess is, that 100% Merino wool is better then the regular type of craft felt that's available everywhere, which is made of soft polymers and not designed to withstand prolonged 30°c + temperatures.
Perhaps a thin type of thermal pad, placed on the bottom of the fan brackets, where they might come in contact with the heatsink, would be more appropriate?