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Key point in hardware maintenance is keeping the dust away and a thermal paste swap once in a blue moon. Other than that, there is not too much need for hardware maintenance unless something dies.
I open the PC from time to time (how often really depends on where you live and how dusty your neighborhood is) and blow out the dust with a compressed air can if I have it, or a fan set to blow cold if I don’t. Also, I vacuum it well first (you want to breathe in as little dust as possible).
Once in a blue moon I also like to blow it out with an air compressor.
As for the graphics card, it can never be really blown out if inside the case, so make sure you take it out from time to time and blow it out well.
Don’t forget to blow out the power supply, as it really can collect a lot of dust during the years. I wouldn’t suggest taking it apart (although high quality units can last), but blowing it out really well is something that should be done from time to time.
Also, sometimes I like to take off the CPU cooler, blow the fins out, brush it out, clean the fan and change the thermal paste.
More rarely, but I also like to remove the GPU cooler, take the heat sink, blow it out well, clean it with a brush, clean the fans well.
Those more extreme steps are something I rarely do though, taking apart the GPU and putting it back together is really not something I’d like to do even once a year. I usually do it once, maybe twice during the lifetime of a GPU.
Also, recently I swapped my PSU for a new one. The old one couldn’t pass the OCCT PSU stress test, so I got a new one. Other components in my PC are mostly rather old and still work like a clock.
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