EVGA allows the removal of the heatsink, change the TIM or thermal pads ..... it Does Not Void your warranty ... (unlike other brands)
However - you have to do the work correctly - As - Physical damage to the card - due to mishap or mishandling - is Not covered by Warranty
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FAQ # 57720 Does water-cooling or installing a third party cooling solution on my video card void the warranty?
Installing third party cooling solutions does not void warranty on our products. Just be sure to keep the original cooling solution as it will have to be on the card if it is ever sent in for RMA. Any physical damage such as burn marks, water residue or damage, or any damage to the PCB will void ALL warranties.
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FAQ # 58128 Will removing the heatsink from the video card and placing a 3rd party one on void my warranty?
No, putting a 3rd party cooling solution on the video card will not void your warranty. However, please take extra precaution when doing so as to make sure you do not damage the card removing the original cooling solution or the card itself installing the new 3rd party heatsink.
Due to our warranty terms cards that do not arrive in original factory condition will be declined warranty support and the product returned at the customer’s expense.
We strongly urge all of our customers to retain the original heat sink/fan.