So your point is... that they only know it's OC'd if you tell them? OK? What does that have to do with what I said?
See above. You didn't break your warranty if they can't tell, immoral so what, they'd screw your cat and steal your house if you gave them the chance. Are you going to give me the indicators that can easily identify a modestly overclocked card or what?
*edit: if you say "well the card is dead LOL!!" then you're basically throwing out manufacturing defects and other abnormalities. The only way they could possibly prove that is if they took the card apart and looked at it under an electron microscope which btw are appointment only pieces of equipment even for million dollar a year profit companies.