Burning / Smoking GPU

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Today my PC went off another time and when I restarted it sparked from one spot and smoked / smelled burnt.

I opened it and started to clean everything. Last time this happened there was dust on the VRMs. Note that my PC is very clean and the last cleanup was only a few months ago.

When I turned it on again it sparked again, I looked at the part, a 1x1mm electrical part on the backside of the card. I cleaned it with a lot of Isopropanol and removed the burned remains. It could have been dust as well.

I tried another time and my GPU still works, I played 2 hourse of BF3 and Warframe in 4K as usual. Should I be worried? It's a 2013 780Ti. I want to switch for a 980Ti soon, but it should be still worth 200 € as long as it works.