Re: HIS 6870 fan dying
There should be screws that hold the stock heatsink on the GPU. Remove those and you can gently remove the heatsink. Remove all thermal paste from the GPU.
You can get a new heatsink from Newegg. Apply new thermal paste if the new one doesn't come pre-applied.
FX-8350 @ 4.7 cooled by H80, 32GB Mushkin Enhanced Blackline 2133, Asus Sabertooth 990FX, 2x Radeon HD 7850 2GB in X-fire, 500GB Samsung 850 Evo, 4TB Seagate, 3TB WD Black, 2x 1TB WD RED in RAID 0