Yup, painting it WILL void your warranty. At least i know for sure that it voids EVGA's warranty. The only way it won't void your warranty is if you have a second unpainted shroud you could use to replace the painted one when you try to send it back or get warranty related help. It also might not completely void your warranty but you might be charged for a replacement shroud. You're best off contacting Asus directly if you're worried about it.
Edited by SeanPoe - 5/24/12 at 11:35am