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If it's turning fine now, then you already have your answer. Fans do one thing. They spin to push air. As for the heatsink...does anything look melted? Any metal charring? Then it also is probably okay.Sorry I wasn't exactly clear.
Like a dummy I bought a microATX case and motherboard before realizing how massive the card would be and the fans were so close to the bottom of the board (and the case for that matter!) that one of the case's led pin connector wires (that I was not using) moved into one of the fans and had been completely obstructing its turning for weeks. I was noticing it being surprisingly hot and when I finally looked into the case I noticed that one of the fans was not turning. I had inspected it right after assembling and both fans were turning fine, so this probably occurred within first few days after that.
I powered down, removed the pin connector wire and the fan starting turning (presumably fine now) along with its twin, but I was just wondering does it damage a case fan or heatsink fan in any way if it is physically stopped from moving while in operation? It seems to be turning fine now but is there any reason for me to expect that this has decreased the life of the fan? And also just out of curiosity, where could I find a single replacement fan for an RX 480 in the instance that it does show signs of failing?
I have always preferred MicroATX cases and boards for price and size on desktop but I see now that the mid to high end cards (even if in theory they could fit) are just to big these days for a MicroATX case and motherboard. High end cards used to fit a microATX just fine. Not any more.
That fan really isn't worth shit, either, and it's replaceable. The thing you're worried about when your fans stop spinning is the GPU. It should be frying. Now that you've got the fan spinning again you can try benchmarking it to see how it performs. I'd strongly suggest monitoring your temps closely while you do this.