HP Probook 4320s i need to replace the thermal paste on graphic card

Hi, I need to replace paste because my laptop is overheating and every video on youtube is basically choppy. I replaced it about 2-3 years ago and it worked perfectly fine until some weeks ago (at that time it was replaced by service). Can you please help me to choose the right type of paste for this NB ? The Graphic card is ATI Radeon Hd 5470. Thanks!
 
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