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.