Is my old hd4870 dead?

Hi, my old graphics card is giving me problems (after 8 years! xD).. I had to "underclock" to 540/640 to get her working. The default values are 750/900. Now I don't know if my graphic card or power supply (Corsair tx650) is "dying". My suspicions goes to the graphic card, is too hold.. Can you help me?

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Sounds like the video card and the CPU could use a good cleaning and some new thermal paste
I've done that already but I guess it was too late, I think the graphic card is damaged because I still had the same problem after that. Both CPU and GPU temperatures are between 50 and 60Cº
 
U might want to check if it is filled with dust inside the computer if it is unplug the computer and blow it out with a compressor. This is usually the problem to overheating and if ur computer is sometimes making loud beeps definitely do this
 
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