Dear ASUS Customer,
first of all we thank you for your enquiry.
If you replace the air heat sink, please keep it so that you can restore the GK to its original condition in the event of a defect. Only then will the warranty remain valid.

It will then probably be an Asus card ;)

...yes, not at EVGA! ;)

Thank you very much for your enquiry!

Unfortunately, we must also inform you that if you retrofit water cooling/full cover block, you will lose your warranty claims for this card.
Best regards,

Your Support Team

Too bad, I'll check with Asus again.